S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n: C\u00e1ch n\u1ed1i d\u00e2y c\u00e1c ti\u1ebfp \u0111i\u1ec3m NO, NC v\u00e0 d\u00e2y chung trong m\u1ea1ch \u0111\u1ed9ng c\u01a1, PLC v\u00e0 m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n<\/title>\n<\/head>\n<body>\n\n<div class=\"bd-post\">\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Manrope:wght@400;600;700&family=Roboto:wght@600;700&display=swap');\n\n.bd-post {\n \/* ---- color tokens: single source = design-plan Color Palette ---- *\/\n --body-bg: #FFFFFF;\n --text-primary: #333333;\n --text-secondary: #6E6E6E;\n --heading-ink: #000000;\n --accent: #479DE2;\n --accent-deep: #2A76B4;\n --accent-hot: #FD9649;\n --accent-hot-deep: #B85C17;\n --navy: #0D3972;\n --inverse-bg: #1E1E1E;\n --inverse-text: #FFFFFF;\n --inv-secondary: #B3B3B3;\n --card-bg: #F4F8FC;\n --card-border: #E0E0E0;\n --divider-dark: #444444;\n --btn-white: #FFFFFF;\n --btn-ink: #1E1E1E;\n \/* ---- spacing system: FIXED STANDARD ---- *\/\n --prose-width: 680px;\n --gap-attach: 16px;\n --gap-normal: 32px;\n --gap-section: 48px;\n --pad-compact: 16px;\n --pad-standard: 24px;\n font-family: \"Manrope\", sans-serif;\n font-size: 16px;\n font-weight: 400;\n line-height: 1.6;\n color: var(--text-primary);\n background: var(--body-bg);\n box-sizing: border-box;\n padding: 40px;\n max-width: 100%;\n}\n.bd-post a { overflow-wrap: anywhere; word-break: break-word; }\n.bd-post p, .bd-post li { overflow-wrap: break-word; }\n.bd-post .bd-post-article { max-width: var(--prose-width); margin: 0 auto; }\n.bd-post [class*=\"bp-\"], .bd-post [class*=\"rich-\"] { box-sizing: border-box; }\n\n\/* ---- prose spacing (FIXED STANDARD) ---- *\/\n.bd-post p { margin: 0 0 1em; }\n.bd-post h2 { font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 34px; line-height: 1.2; color: var(--heading-ink); margin: 48px 0 16px; }\n.bd-post h3 { font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 24px; line-height: 1.25; color: var(--heading-ink); margin: 32px 0 12px; }\n.bd-post ul, .bd-post ol { margin: 0 0 1em; padding-left: 1.5em; }\n.bd-post ul li::marker { color: var(--accent-deep); }\n.bd-post li { margin-bottom: 0.5em; }\n.bd-post strong { font-weight: 700; }\n\n\/* ---- anchors: permit-list forms only ---- *\/\n.bd-post p a, .bd-post li a, .bd-post blockquote a, .bd-post td a { color: var(--accent-deep); text-decoration: underline; text-decoration-color: currentColor; }\n\n\/* ---- block outer margins: direct children, specific classes ---- *\/\n.bd-post-article > .bp-1-break,\n.bd-post-article > .bp-3-ratings,\n.bd-post-article > .rich-table-wrap,\n.bd-post-article > .rich-callout-warning { margin: var(--gap-normal) 0; }\n.bd-post-article > .bp-2-loop { margin: var(--gap-section) 0 var(--gap-normal); }\n.bd-post-article > .bp-cta-mid { margin: var(--gap-section) 0 0; }\n.bd-post-article > .bp-cta-end { margin: var(--gap-section) 0 0; }\n\n\/* ---- BP-1: broken-wire signature block (high, solid inverse) ---- *\/\n.bp-1-break { background: var(--inverse-bg); color: var(--inverse-text); padding: var(--pad-standard); }\n.bp-1-title { margin: 0 0 6px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 18px; line-height: 1.3; color: var(--inverse-text); }\n.bp-1-title .bp-1-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent); }\n.bp-1-lede { margin: 0 0 14px; font-size: 14px; line-height: 1.5; color: var(--inv-secondary); }\n.bp-1-cols { display: flex; align-items: stretch; gap: 24px; }\n.bp-1-col { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; gap: 6px; border-top: 2px solid var(--accent); padding-top: 12px; }\n.bp-1-col-no { border-top-color: var(--accent-hot); }\n.bp-1-cols > .bp-1-col + .bp-1-col { border-left: 1px solid var(--divider-dark); padding-left: 24px; }\n.bp-1-col-head { display: flex; align-items: center; gap: 8px; margin: 0 0 2px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 13px; line-height: 1.4; letter-spacing: 0.4px; text-transform: uppercase; color: var(--inv-secondary); }\n.bp-1-col-head .bp-1-col-ic { display: inline-flex; flex: 0 0 auto; }\n.bp-1-col-head .bp-1-ic-ok { color: var(--accent); }\n.bp-1-col-head .bp-1-ic-no { color: var(--accent-hot); }\n.bp-1-ctx { margin: 0; font-size: 13px; line-height: 1.5; color: var(--inv-secondary); }\n.bp-1-mech { margin: 0; font-size: 15px; line-height: 1.55; color: var(--inverse-text); }\n.bp-1-verdict { margin: 6px 0 0; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 20px; line-height: 1.3; }\n.bp-1-verdict-ok { color: var(--accent); }\n.bp-1-verdict-no { color: var(--accent-hot); }\n\n\/* ---- BP-2: closed-loop flow (medium, tint + border) ---- *\/\n.bp-2-loop { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-compact); }\n.bp-2-title { margin: 0 0 10px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 15px; line-height: 1.4; color: var(--text-primary); }\n.bp-2-title .bp-2-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.bp-2-flow { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }\n.bp-2-chip { flex: 0 1 auto; background: var(--body-bg); border: 1px solid var(--card-border); border-radius: 6px; padding: 6px 12px; font-size: 14px; line-height: 1.4; color: var(--text-primary); }\n.bp-2-chip.bp-2-chip-key { font-weight: 700; }\n.bp-2-arrow { display: inline-flex; flex: 0 0 auto; align-items: center; justify-content: center; width: 20px; color: var(--accent-deep); }\n.bp-2-foot { margin: 10px 0 0; font-size: 13px; line-height: 1.5; color: var(--text-secondary); }\n\n\/* ---- BP-3: contact ratings reference card (medium, tint + border) ---- *\/\n.bp-3-ratings { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-standard); }\n.bp-3-title { margin: 0 0 12px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 16px; line-height: 1.4; color: var(--text-primary); }\n.bp-3-title .bp-3-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.bp-3-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }\n.bp-3-unit { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; gap: 6px; }\n.bp-3-unit-head { margin: 0; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 13px; line-height: 1.4; letter-spacing: 0.4px; text-transform: uppercase; color: var(--accent-deep); }\n.bp-3-line { margin: 0; display: flex; align-items: baseline; justify-content: space-between; gap: 8px; font-size: 14px; line-height: 1.5; color: var(--text-secondary); }\n.bp-3-line .bp-3-num { font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 17px; line-height: 1.3; color: var(--accent-deep); }\n.bp-3-foot { margin: 12px 0 0; border-top: 1px solid var(--card-border); padding-top: 10px; font-size: 13px; line-height: 1.5; color: var(--text-secondary); }\n\n\/* ---- Rich: comparison tables + native prose tables ---- *\/\n.rich-table-wrap { overflow-x: auto; }\n.rich-table { width: 100%; border-collapse: collapse; }\n.rich-table th { background: var(--card-bg); color: var(--navy); font-family: \"Roboto\", sans-serif; font-weight: 700; text-align: left; padding: 12px 14px; border-bottom: 2px solid var(--navy); }\n.rich-table td { padding: 12px 14px; border-bottom: 1px solid var(--card-border); color: var(--text-primary); vertical-align: top; }\n.rich-table tbody tr:nth-child(even) td { background: var(--card-bg); }\n.rich-table tbody tr td:first-child { font-weight: 600; }\n\n\/* ---- Rich: warning callout (low: tint + border + left bar) ---- *\/\n.rich-callout-warning { display: flex; align-items: flex-start; gap: 12px; background: var(--card-bg); border: 1px solid var(--card-border); border-left: 4px solid var(--accent-hot-deep); padding: var(--pad-compact); }\n.rich-callout-warning .rich-callout-icon { display: inline-flex; flex: 0 0 auto; color: var(--accent-hot-deep); margin-top: 2px; }\n.rich-callout-warning p { margin: 0; font-size: 15px; line-height: 1.6; color: var(--text-primary); }\n\n\/* ---- BP-cta-mid (banner, tint + border) ---- *\/\n.bp-cta-mid { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-standard); display: flex; flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; text-align: left; }\n.bp-cta-mid-copy { display: flex; flex-direction: column; gap: 4px; max-width: 430px; }\n.bp-cta-mid-lead { margin: 0; font-size: 16px; line-height: 1.55; color: var(--text-primary); }\n.bp-cta-mid-lead strong { font-weight: 700; }\n.bp-cta-mid-note { margin: 0; font-size: 13px; line-height: 1.5; color: var(--text-secondary); }\n.bp-cta-mid-btn { display: inline-block; flex: 0 0 auto; background: var(--accent-hot); color: var(--btn-ink); font-family: \"Manrope\", sans-serif; font-weight: 700; font-size: 15px; line-height: 1.2; text-decoration: none; border-radius: 6px; padding: 12px 24px; }\n\n\/* ---- BP-cta-end ---- *\/\n.bp-cta-end { background: var(--inverse-bg); color: var(--inverse-text); padding: var(--pad-standard); display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }\n.bp-cta-end-title { margin: 0; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 22px; line-height: 1.3; color: var(--inverse-text); }\n.bp-cta-end-title .bp-cta-end-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent); }\n.bp-cta-end-title .bp-cta-end-icon svg { width: 28px; height: 28px; }\n.bp-cta-end-sub { margin: 0; font-size: 16px; line-height: 1.6; color: var(--inv-secondary); max-width: 520px; }\n.bp-cta-end-btn { display: inline-block; background: var(--accent-hot); color: var(--btn-ink); font-family: \"Manrope\", sans-serif; font-weight: 700; font-size: 16px; line-height: 1.2; text-decoration: none; border-radius: 6px; padding: 14px 28px; }\n\n\/* ---- References ---- *\/\n.bd-refs { font-size: 14px; color: var(--text-secondary); }\n.bd-refs li { margin-bottom: 0.5em; }\n\n\/* ---- sanctioned motion (gated, no loops, hover only on designed blocks) ---- *\/\n@media (prefers-reduced-motion: no-preference) {\n .bd-post h2 { transition: color 0.2s ease-out, transform 0.2s ease-out; transform-origin: left; }\n .bd-post h2:hover { color: var(--accent-deep); transform: scale(1.02); }\n .bd-post p a, .bd-post li a { transition: color 0.2s ease-out; }\n .bd-post p a:hover, .bd-post li a:hover { color: var(--accent-hot-deep); }\n .bp-cta-end-btn { transition: background 0.2s ease-out, color 0.2s ease-out, transform 0.2s ease-out; }\n .bp-cta-end-btn:hover { background: var(--btn-white); color: var(--navy); transform: translateY(-1px); }\n .bp-cta-mid-btn { transition: background 0.2s ease-out, color 0.2s ease-out, transform 0.2s ease-out; }\n .bp-cta-mid-btn:hover { background: var(--navy); color: var(--btn-white); transform: translateY(-1px); }\n}\n\n\/* ---- mobile (\u2264768): mechanical adaptation ---- *\/\n@media (max-width: 768px) {\n .bd-post { padding: 16px; }\n .bd-post h2 { font-size: 26px; margin-top: 32px; }\n .bd-post h3 { font-size: 20px; margin-top: 24px; }\n .bp-cta-end-title .bp-cta-end-icon svg { width: 21px; height: 21px; }\n .bp-1-cols { flex-direction: column; gap: 16px; }\n .bp-1-cols > .bp-1-col + .bp-1-col { border-left: 0; padding-left: 0; }\n .bp-cta-mid { flex-direction: column; align-items: flex-start; text-align: left; }\n .bp-2-flow { flex-direction: column; align-items: center; gap: 2px; }\n .bp-2-flow .bp-2-arrow svg { transform: rotate(90deg); }\n .bp-3-grid { grid-template-columns: 1fr; }\n}\n@media (max-width: 767px) {\n .bd-post h2 { font-size: 26px; }\n .bd-post h3 { font-size: 20px; }\n}\n<\/style>\n<article class=\"bd-post-article\">\n<p>S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n tr\u00f4ng c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n: ba c\u1ef1c, v\u00e0i \u0111\u01b0\u1eddng d\u00e2y, th\u1ebf l\u00e0 xong. Tuy nhi\u00ean, c\u00f9ng m\u1ed9t c\u00f4ng t\u1eafc ba c\u1ef1c n\u00e0y l\u1ea1i \u0111\u01b0\u1ee3c n\u1ed1i theo ba c\u00e1ch ho\u00e0n to\u00e0n kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o m\u1ea1ch \u0111i\u1ec7n m\u00e0 n\u00f3 n\u1eb1m trong: n\u1ed1i tr\u1ef1c ti\u1ebfp v\u00e0o cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 ho\u1eb7c cu\u1ed9n d\u00e2y c\u00f4ng t\u1eafc t\u01a1, n\u1ed1i v\u00e0o th\u1ebb \u0111\u1ea7u v\u00e0o PLC, ho\u1eb7c n\u1ed1i song song v\u1edbi m\u1ed9t c\u1eb7p c\u00f4ng t\u1eafc tr\u00ean tr\u1ee5c \u0111\u1ea3o chi\u1ec1u. N\u1ebfu n\u1ed1i sai, s\u1ef1 c\u1ed1 s\u1ebd kh\u00f4ng bao gi\u1edd ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 \u201cn\u00f3 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng\u201d. M\u00e0 l\u00e0 <em>t\u1ec7 h\u01a1n<\/em>: m\u00e1y v\u1eabn ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng trong khi l\u1ebd ra ph\u1ea3i d\u1eebng l\u1ea1i r\u1ed3i.<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1c c\u00e1ch \u0111\u1ea5u d\u00e2y cho m\u1ed9t c\u00f4ng t\u1eafc, c\u00e1ch ch\u1ecdn lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m (NO hay NC) v\u00e0 l\u00fd do t\u1ea1i sao s\u1ef1 l\u1ef1a ch\u1ecdn \u0111\u00f3 quy\u1ebft \u0111\u1ecbnh h\u01b0\u1edbng s\u1ef1 c\u1ed1 c\u1ee7a m\u1ea1ch \u0111i\u1ec7n, c\u00e1ch k\u1ebft n\u1ed1i c\u00f9ng m\u1ed9t c\u00f4ng t\u1eafc v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a PLC ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, c\u00e1ch ki\u1ec3m tra k\u1ebft qu\u1ea3 c\u00f4ng vi\u1ec7c b\u1eb1ng \u0111\u1ed3ng h\u1ed3 \u0111o, v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 nh\u1eefng th\u00f4ng s\u1ed1 c\u1ea7n ki\u1ec3m tra khi mua s\u1ea3n ph\u1ea9m thay th\u1ebf. \u0110\u1ebfn cu\u1ed1i h\u01b0\u1edbng d\u1eabn, b\u1ea1n s\u1ebd c\u00f3 th\u1ec3 \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i: t\u1eeb m\u1ea1ch \u0111i\u1ec7n \u0111\u1ebfn m\u00e3 s\u1ea3n ph\u1ea9m.<\/p>\n\n<h2>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n l\u00e0 g\u00ec \u2014 v\u00e0 b\u00e0i vi\u1ebft n\u00e0y kh\u00f4ng \u0111\u1ec1 c\u1eadp \u0111\u1ebfn \u0111i\u1ec1u g\u00ec<\/h2>\n<p>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb c\u01a1 \u0111i\u1ec7n c\u00f3 b\u1ed9 truy\u1ec1n \u0111\u1ed9ng (p\u00edt-t\u00f4ng, c\u1ea7n l\u0103n, thanh g\u1ea1t ho\u1eb7c tr\u1ee5c quay) v\u00e0 m\u1ed9t b\u1ed9 ti\u1ebfp \u0111i\u1ec3m b\u00ean trong. Khi m\u1ed9t b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u00e1y m\u00f3c, ch\u1eb3ng h\u1ea1n nh\u01b0 pallet b\u0103ng t\u1ea3i, xe \u0111\u1ea9y ho\u1eb7c c\u1eeda, \u0111\u1ea9y b\u1ed9 truy\u1ec1n \u0111\u1ed9ng v\u01b0\u1ee3t qua \u0111i\u1ec3m c\u00e0i \u0111\u1eb7t, c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng t\u1ee9c th\u1eddi b\u00ean trong s\u1ebd \u0111\u1ea3o chi\u1ec1u c\u00e1c ti\u1ebfp \u0111i\u1ec3m trong v\u00f2ng ch\u01b0a \u0111\u1ea7y m\u1ed9t mili gi\u00e2y, t\u1eeb \u0111\u00f3 m\u1edf ho\u1eb7c \u0111\u00f3ng m\u1ea1ch \u0111i\u1ec7n. T\u00ean g\u1ecdi n\u00e0y xu\u1ea5t ph\u00e1t t\u1eeb ch\u1ee9c n\u0103ng ban \u0111\u1ea7u: \u0111\u00e1nh d\u1ea5u gi\u1edbi h\u1ea1n v\u1eadt l\u00fd c\u1ee7a h\u00e0nh tr\u00ecnh \u0111\u1ec3 m\u00e1y m\u00f3c d\u1eebng l\u1ea1i ho\u1eb7c \u0111\u1ea3o chi\u1ec1u tr\u01b0\u1edbc khi g\u00e2y h\u01b0 h\u1ecfng cho ch\u00ednh n\u00f3 ho\u1eb7c t\u1ea3i tr\u1ecdng.<\/p>\n<p>Tr\u01b0\u1edbc khi xem c\u00e1c s\u01a1 \u0111\u1ed3, xin l\u00e0m r\u00f5 m\u1ed9t \u0111i\u1ec1u \u0111\u1ec3 c\u00e1c b\u1ea1n kh\u00f4ng ph\u1ea3i l\u00e3ng ph\u00ed c\u1ea3 m\u1ed9t bu\u1ed5i chi\u1ec1u: b\u00e0i vi\u1ebft n\u00e0y n\u00f3i v\u1ec1 <strong>c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n ti\u1ebfp x\u00fac c\u01a1 h\u1ecdc<\/strong>, c\u00e1c c\u00f4ng t\u1eafc c\u00f4ng nghi\u1ec7p c\u00f3 \u0111\u1ea7u n\u1ed1i v\u00edt d\u00f9ng cho h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec1u khi\u1ec3n. \u201cC\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n\u201d m\u00e0 b\u1ea1n th\u1ea5y b\u00ean trong l\u00f2 s\u01b0\u1edfi ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u1eeda gara l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb kh\u00e1c (c\u00f4ng t\u1eafc nhi\u1ec7t ho\u1eb7c c\u00f4ng t\u1eafc v\u1ecb tr\u00ed c\u1eeda) v\u1edbi c\u00e1ch \u0111\u1ea5u d\u00e2y kh\u00e1c. N\u1ebfu b\u1ea1n \u0111ang s\u1eeda ch\u1eefa l\u00f2 s\u01b0\u1edfi ho\u1eb7c \u0111\u1ed9ng c\u01a1 c\u1eeda, c\u00e1c s\u01a1 \u0111\u1ed3 d\u01b0\u1edbi \u0111\u00e2y s\u1ebd kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00f4ng t\u1eafc c\u01a1 \u0111i\u1ec7n, m\u1ecdi v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n \u0111\u1ec1u t\u1eadp trung v\u00e0o ba c\u1ef1c, v\u00e0 ch\u1ec9 c\u1ea7n quy\u1ebft \u0111\u1ecbnh m\u1ed9t \u0111i\u1ec1u: ti\u1ebfp \u0111i\u1ec3m n\u00e0o s\u1ebd \u0111\u1ea3m nh\u1eadn ch\u1ee9c n\u0103ng ng\u1eaft m\u1ea1ch.<\/p>\n\n<h2>Ba \u0111\u1ea7u n\u1ed1i: C\u00e1c h\u00ecnh th\u1ee9c n\u1ed1i d\u00e2y c\u1ee7a m\u1ed9t c\u00f4ng t\u1eafc (2 d\u00e2y \/ 3 ch\u00e2n \/ 4 \u0111\u1ea7u n\u1ed1i)<\/h2>\n<p>M\u1ed7i kh\u1ed1i ti\u1ebfp \u0111i\u1ec3m c\u1ee7a c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n ti\u00eau chu\u1ea9n \u0111\u1ec1u c\u00f3 ba \u0111\u1ea7u n\u1ed1i: <strong>COM<\/strong> (th\u01b0\u1eddng g\u1eb7p), <strong>KH\u00d4NG<\/strong> (th\u01b0\u1eddng m\u1edf), v\u00e0 <strong>NC<\/strong> (th\u01b0\u1eddng \u0111\u00f3ng).<\/p>\n<ul>\n<li>Khi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng \u1edf tr\u1ea1ng th\u00e1i ngh\u1ec9, m\u1ea1ch COM\u2013NC \u1edf tr\u1ea1ng th\u00e1i \u0111\u00f3ng li\u00ean t\u1ee5c v\u00e0 m\u1ea1ch COM\u2013NO \u1edf tr\u1ea1ng th\u00e1i h\u1edf.<\/li>\n<li>Khi nh\u1ea5n v\u00e0o b\u1ed9 truy\u1ec1n \u0111\u1ed9ng, c\u00e1c ti\u1ebfp \u0111i\u1ec3m s\u1ebd chuy\u1ec3n \u0111\u1ed5i \u0111\u1ed3ng th\u1eddi: ti\u1ebfp \u0111i\u1ec3m COM\u2013NC m\u1edf ra v\u00e0 ti\u1ebfp \u0111i\u1ec3m COM\u2013NO \u0111\u00f3ng l\u1ea1i.<\/li>\n<\/ul>\n<p>V\u00ec ti\u1ebfp \u0111i\u1ec3m \u0111\u1ed9ng chuy\u1ec3n \u0111\u1ed5i gi\u1eefa hai ti\u1ebfp \u0111i\u1ec3m c\u1ed1 \u0111\u1ecbnh, n\u00ean c\u00f4ng t\u1eafc n\u00e0y l\u00e0 thi\u1ebft b\u1ecb m\u1ed9t c\u1ef1c hai v\u1ecb tr\u00ed (SPDT). B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ri\u00eang ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf (NO), ri\u00eang ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng \u0111\u00f3ng (NC) ho\u1eb7c c\u1ea3 hai. Hai m\u1ea1ch \u0111i\u1ec7n \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i c\u00f9ng m\u1ed9t l\u00fac b\u1edfi m\u1ed9t b\u1ed9 truy\u1ec1n \u0111\u1ed9ng.<\/p>\n<p>Ch\u00ednh kh\u1ed1i n\u1ed1i ba c\u1ef1c \u0111\u00f3 l\u00e0 \u0111i\u1ec1u m\u00e0 ng\u01b0\u1eddi ta th\u01b0\u1eddng g\u1ecdi l\u00e0 c\u00e1c d\u1ea1ng \u201c2 d\u00e2y\u201d, \u201c3 d\u00e2y\u201d v\u00e0 \u201c4 d\u00e2y\u201d, v\u00e0 thu\u1eadt ng\u1eef n\u00e0y c\u00f3 \u00fd ngh\u0129a r\u1ed9ng h\u01a1n so v\u1edbi v\u1ebb b\u1ec1 ngo\u00e0i:<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Nh\u1eefng g\u00ec b\u1ea1n c\u00f3<\/th><th>\u00dd ngh\u0129a c\u1ee7a \u0111i\u1ec1u \u0111\u00f3 l\u00e0 g\u00ec<\/th><th>C\u00e1ch \u0111\u1ea5u d\u00e2y th\u00f4ng th\u01b0\u1eddng<\/th><th>Ph\u00f9 h\u1ee3p nh\u1ea5t cho<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>2 d\u00e2y (hai \u0111i\u1ec3m k\u1ebft n\u1ed1i)<\/td><td>M\u1ed9t ti\u1ebfp \u0111i\u1ec3m c\u1ee7a kh\u1ed1i COM\/NO\/NC, ho\u1eb7c m\u1ed9t c\u00f4ng t\u1eafc 2 c\u1ef1c<\/td><td>C\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c n\u1ed1i d\u00e2y theo m\u1ea1ch n\u1ed1i ti\u1ebfp v\u1edbi t\u1ea3i, ngu\u1ed3n \u0111i\u1ec7n ho\u1eb7c \u0111\u1ea7u v\u00e0o<\/td><td>C\u00e1c m\u1ea1ch d\u1eebng\/ch\u1ea1y \u0111\u01a1n gi\u1ea3n nh\u1ea5t; c\u01a1 ch\u1ebf d\u1eebng khi \u0111\u1ea1t gi\u1edbi h\u1ea1n h\u00e0nh tr\u00ecnh<\/td><\/tr>\n<tr><td>3 ch\u00e2n \/ 3 c\u1ef1c<\/td><td>SPDT \u0111\u1ea7y \u0111\u1ee7: COM + NO + NC \u0111\u1ec1u \u0111\u01b0\u1ee3c d\u1eabn ra ngo\u00e0i<\/td><td>Ch\u1ecdn NO ho\u1eb7c NC cho t\u1eebng ch\u1ee9c n\u0103ng; c\u1ea3 hai t\u00f9y ch\u1ecdn \u0111\u1ec1u c\u00f3 s\u1eb5n<\/td><td>M\u1ed9t c\u00f4ng t\u1eafc v\u1eeba \u0111\u1ea3m nh\u1eadn ch\u1ee9c n\u0103ng d\u1eebng v\u1eeba \u0111\u1ea3m nh\u1eadn ch\u1ee9c n\u0103ng t\u00edn hi\u1ec7u<\/td><\/tr>\n<tr><td>4 c\u1ef1c<\/td><td>Hai m\u1ea1ch ti\u1ebfp \u0111i\u1ec3m \u0111\u1ed9c l\u1eadp trong c\u00f9ng m\u1ed9t th\u00e2n (v\u00ed d\u1ee5: hai m\u1ea1ch chuy\u1ec3n \u0111\u1ed5i, ho\u1eb7c NO + NC v\u1edbi c\u00e1c c\u1ef1c chung ri\u00eang bi\u1ec7t)<\/td><td>Hai t\u1ea3i ho\u1eb7c hai \u0111\u1ea7u v\u00e0o \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi m\u1ed9t b\u1ed9 truy\u1ec1n \u0111\u1ed9ng<\/td><td>Ph\u1ea3n h\u1ed3i v\u1ecb tr\u00ed c\u1eeda\/van tr\u00ean hai m\u1ea1ch ri\u00eang bi\u1ec7t<\/td><\/tr>\n<tr><td>\u201c4 d\u00e2y\u201d (d\u00e2y c\u00e1p \u0111i\u1ec1u khi\u1ec3n)<\/td><td>M\u1ed9t d\u00e2y c\u00e1p c\u00f3 \u0111\u1ea7u n\u1ed1i t\u1eeb b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, ch\u1ee9 kh\u00f4ng ph\u1ea3i t\u1eeb c\u00e1c c\u1ef1c c\u1ee7a c\u00f4ng t\u1eafc<\/td><td>H\u00e3y l\u00e0m theo h\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, kh\u00f4ng ph\u1ea3i theo m\u00e0u c\u1ee7a c\u00f4ng t\u1eafc<\/td><td>D\u00e2y n\u1ecbt \u0111i\u1ec7n cho robot\/ph\u01b0\u01a1ng ti\u1ec7n. Kh\u00f4ng n\u00ean nh\u1ea7m l\u1eabn v\u1edbi c\u00e1c \u0111\u1ea7u n\u1ed1i c\u00f4ng t\u1eafc<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>C\u1ea7n gi\u1ea3i th\u00edch r\u00f5 v\u1ec1 \u201cc\u01a1 ch\u1ebf 4 d\u00e2y\u201d. Trong l\u0129nh v\u1ef1c robot v\u00e0 th\u1ee7y l\u1ef1c (v\u00ed d\u1ee5 nh\u01b0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n trung t\u00e2m c\u1ee7a robot FTC, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n r\u01a1-mo\u00f3c t\u1ef1 \u0111\u1ed5), ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00f9ng thu\u1eadt ng\u1eef \u201cc\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n 4 d\u00e2y\u201d khi mu\u1ed1n ch\u1ec9 <strong>d\u00e2y c\u00e1p b\u1ed9 \u0111i\u1ec1u khi\u1ec3n<\/strong>: b\u1ed1n d\u00e2y d\u1eabn, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u b\u1eb1ng m\u00e3 m\u00e0u, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u00e0u \u0111en cho d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 m\u00e0u n\u00e2u cho cu\u1ed9n d\u00e2y l\u00ean. \u0110\u00f3 l\u00e0 m\u1ed9t s\u1ee3i c\u00e1p, kh\u00f4ng ph\u1ea3i s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ea7u n\u1ed1i. Tr\u00ean th\u00e2n c\u00f4ng t\u1eafc, y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh lu\u00f4n l\u00e0 kh\u1ed1i \u0111\u1ea7u n\u1ed1i. H\u00e3y d\u00e1n nh\u00e3n cho c\u00e1c \u0111\u1ea7u n\u1ed1i, \u0111\u1ebfm s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ea7u n\u1ed1i v\u00e0 \u0111\u1eebng bao gi\u1edd tin v\u00e0o m\u00e0u s\u1eafc c\u1ee7a d\u00e2y d\u1eabn.<\/p>\n<p>M\u00e0u d\u00e2y th\u1ef1c s\u1ef1 kh\u00f4ng \u0111\u00e1ng tin c\u1eady trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y. C\u00e1c h\u01b0\u1edbng d\u1eabn d\u00e0nh cho ng\u01b0\u1eddi ti\u00eau d\u00f9ng th\u01b0\u1eddng n\u00eau \u201cm\u00e0u \u0111\u1ecf l\u00e0 c\u1ef1c d\u01b0\u01a1ng (+), m\u00e0u \u0111en l\u00e0 c\u1ef1c \u00e2m (-)\u201d, v\u00e0 ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng b\u1ed1i r\u1ed1i kh\u00f4ng bi\u1ebft n\u00ean n\u1ed1i m\u00e0u n\u00e0o v\u00e0o \u0111\u00e2u. C\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a m\u1ed9t c\u1ed1 v\u1ea5n robotics gi\u00e0u kinh nghi\u1ec7m tr\u00ean m\u1ed9t ch\u1ee7 \u0111\u1ec1 di\u1ec5n \u0111\u00e0n FIRST ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u201cm\u00e0u d\u00e2y kh\u00f4ng quan tr\u1ecdng\u2026 th\u00f4ng th\u01b0\u1eddng COM v\u00e0 NO \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi \u0111\u1ea5t v\u00e0 t\u00edn hi\u1ec7u.\u201d C\u00e1c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u00f4ng nghi\u1ec7p kh\u00f4ng c\u00f3 ti\u00eau chu\u1ea9n m\u00e0u d\u00e2y chung, do \u0111\u00f3 hai c\u00f4ng t\u1eafc tr\u00f4ng gi\u1ed1ng h\u1ec7t nhau c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t v\u1edbi c\u00e1c quy \u01b0\u1edbc b\u00ean trong kh\u00e1c nhau. C\u00e1ch nh\u1eadn bi\u1ebft duy nh\u1ea5t \u0111\u00e1ng tin c\u1eady l\u00e0 k\u00fd hi\u1ec7u tr\u00ean \u0111\u1ea7u n\u1ed1i (COM\/NO\/NC, ho\u1eb7c \u0111\u01b0\u1ee3c \u0111\u00e1nh s\u1ed1 1\u20132\u20133\u20134) k\u1ebft h\u1ee3p v\u1edbi vi\u1ec7c ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c.<\/p>\n<p>C\u00f4ng t\u1eafc vi m\u00f4 c\u0169ng c\u00f3 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0ng trong m\u1ed9t th\u00e2n c\u00f4ng t\u1eafc nh\u1ecf h\u01a1n: \u0111\u00e2y l\u00e0 lo\u1ea1i c\u00f4ng t\u1eafc h\u00e0nh \u0111\u1ed9ng b\u1eadt\/t\u1eaft thu nh\u1ecf v\u1edbi kh\u1ed1i ti\u1ebfp \u0111i\u1ec3m COM\/NO\/NC gi\u1ed1ng h\u1ec7t, th\u01b0\u1eddng c\u00f3 \u0111\u1ecbnh m\u1ee9c trong d\u1ea3i 10\u201315 A \u1edf 250 VAC (<a href=\"https:\/\/tameson.com\/pages\/limit-switch\">Tameson<\/a>). N\u1ebfu b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ea5u d\u00e2y cho m\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n k\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n th\u00ec b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 \u0111\u1ea5u d\u00e2y cho m\u1ed9t c\u00f4ng t\u1eafc vi m\u00f4. C\u00e1ch \u0111\u1ea5u d\u00e2y c\u00e1c c\u1ef1c l\u00e0 ho\u00e0n to\u00e0n gi\u1ed1ng nhau.<\/p>\n\n\n<div style=\"margin:32px 0; padding:20px; background:#EAF3FB; border:1px solid #D3D3D3; border-radius:12px;\">\n <p style=\"margin:0 0 12px; font-family:'Roboto',sans-serif; font-size:18px; font-weight:700; line-height:1.35; color:#0D3972;\">\n Xem: C\u00e1ch k\u1ebft n\u1ed1i c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 \u0111\u1ea5u d\u00e2y NO\/NC\n <\/p>\n\n <div style=\"position:relative; width:100%; aspect-ratio:16 \/ 9; overflow:hidden; border-radius:8px; background:#000;\">\n <iframe\n src=\"https:\/\/www.youtube.com\/embed\/BM7i5BNdZp4?rel=0\"\n title=\"K\u1ebft n\u1ed1i c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 c\u00e1ch \u0111\u1ea5u d\u00e2y NO\/NC\"\n loading=\"lazy\"\n style=\"position:absolute; inset:0; width:100%; height:100%; border:0;\"\n allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\"\n referrerpolicy=\"strict-origin-when-cross-origin\"\n allowfullscreen>\n <\/iframe>\n <\/div>\n<\/div>\n\n<h2>NO hay NC? L\u1ef1a ch\u1ecdn lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m b\u1ecb ng\u1eaft \u0111\u00fang c\u00e1ch<\/h2>\n<p>C\u00e2u h\u1ecfi m\u00e0 m\u1ecdi ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng \u0111\u1eb7t ra: \u201cT\u00f4i n\u00ean d\u00f9ng NO hay NC?\u201d, th\u01b0\u1eddng \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi b\u1eb1ng m\u1ed9t c\u00e2u kh\u1ea9u hi\u1ec7u: <em>S\u1eed d\u1ee5ng NC \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n<\/em>. C\u00e2u kh\u1ea9u hi\u1ec7u \u0111\u00f3 ch\u1ec9 \u0111\u00fang m\u1ed9t n\u1eeda v\u00e0 g\u00e2y ra nh\u1eefng t\u00e1c h\u1ea1i th\u1ef1c s\u1ef1 khi \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng m\u1ed9t c\u00e1ch m\u00f9 qu\u00e1ng, b\u1edfi v\u00ec n\u00f3 b\u1ecf qua b\u1ea3n ch\u1ea5t c\u1ee7a m\u1ed1i li\u00ean h\u1ec7 \u0111\u00f3 <em>\u0111\u1ec3<\/em> trong m\u1ea1ch c\u1ee7a b\u1ea1n.<\/p>\n<h3>H\u00e0m n\u00e0y x\u00e1c \u0111\u1ecbnh lo\u1ea1i t\u00e1c v\u1ee5: t\u00e1c v\u1ee5 d\u1eebng (stop-jobs) hay t\u00e1c v\u1ee5 s\u1ef1 ki\u1ec7n (event-jobs)<\/h3>\n<p>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n th\u1ef1c hi\u1ec7n m\u1ed9t trong hai ch\u1ee9c n\u0103ng, v\u00e0 ch\u1ee9c n\u0103ng \u0111\u00f3 quy\u1ebft \u0111\u1ecbnh lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m:<\/p>\n<ul>\n<li><strong>C\u00f4ng vi\u1ec7c t\u1ea1m ng\u01b0ng<\/strong>: ch\u1ed1t gi\u1edbi h\u1ea1n h\u00e0nh tr\u00ecnh, c\u01a1 ch\u1ebf kh\u00f3a an to\u00e0n, thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ch\u1ed1ng v\u01b0\u1ee3t h\u00e0nh tr\u00ecnh. M\u1ea1ch ho\u1ea1t \u0111\u1ed9ng \u1edf tr\u1ea1ng th\u00e1i b\u00ecnh th\u01b0\u1eddng v\u00e0 ph\u1ea3i <em>th\u1ea3<\/em> khi \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n. N\u1ed1i d\u00e2y <strong>NC<\/strong> ti\u1ebfp \u0111i\u1ec3m n\u1ed1i ti\u1ebfp. D\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua (ho\u1eb7c t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o \u1edf m\u1ee9c logic 1) khi m\u00e1y \u0111ang di chuy\u1ec3n; vi\u1ec7c m\u1edf ti\u1ebfp \u0111i\u1ec3m NC khi \u0111\u1ea1t gi\u1edbi h\u1ea1n s\u1ebd ng\u1eaft m\u1ea1ch.<\/li>\n<li><strong>C\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn s\u1ef1 ki\u1ec7n<\/strong>: \u0111\u1ebfn v\u1ecb tr\u00ed, ph\u00e1t hi\u1ec7n v\u1ecb tr\u00ed ban \u0111\u1ea7u, \u0111\u1ebfm, x\u00e1c nh\u1eadn \u201c\u0111\u00e3 \u0111\u1ebfn\u201d. Kh\u00f4ng c\u00f3 ho\u1ea1t \u0111\u1ed9ng n\u00e0o di\u1ec5n ra cho \u0111\u1ebfn khi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng \u0111\u01b0\u1ee3c nh\u1ea5n. N\u1ed1i d\u00e2y <strong>KH\u00d4NG<\/strong> li\u00ean h\u1ec7. M\u1ea1ch ch\u1ec9 \u0111\u00f3ng (ho\u1eb7c gi\u00e1 tr\u1ecb \u0111\u1ea7u v\u00e0o chuy\u1ec3n sang 1) khi th\u1ef1c s\u1ef1 \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n.<\/li>\n<\/ul>\n<p>N\u1ebfu b\u1ea1n \u00e9p ch\u1ebf \u0111\u1ed9 NC v\u00e0o m\u1ed9t t\u00e1c v\u1ee5 s\u1ef1 ki\u1ec7n, m\u00e1y c\u1ee7a b\u1ea1n s\u1ebd k\u00edch ho\u1ea1t to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng <em>tr\u1eeb khi<\/em> khi c\u1ea7n thi\u1ebft. N\u1ebfu b\u1ea1n \u00e9p gi\u00e1 tr\u1ecb NO v\u00e0o l\u1ec7nh d\u1eebng c\u00f4ng vi\u1ec7c, b\u1ea1n s\u1ebd g\u1eb7p ph\u1ea3i t\u00ecnh tr\u1ea1ng l\u1ed7i nh\u01b0 d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h3>T\u1ea1i sao c\u00e1c c\u00f4ng vi\u1ec7c t\u1ea1m d\u1eebng n\u00ean \u0111\u01b0\u1ee3c coi l\u00e0 NC: ma tr\u1eadn d\u00e2y \u0111\u1ee9t<\/h3>\n<p>L\u00fd do kh\u00f4ng ph\u1ea3i l\u00e0 do quy \u01b0\u1edbc. \u0110\u00f3 l\u00e0 nh\u1eefng g\u00ec x\u1ea3y ra khi d\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng, \u0111\u00e2y l\u00e0 s\u1ef1 c\u1ed1 th\u01b0\u1eddng g\u1eb7p nh\u1ea5t trong th\u1ef1c t\u1ebf \u0111\u1ed1i v\u1edbi m\u1ea1ch n\u00e0y (<a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">cu\u1ed9c th\u1ea3o lu\u1eadn tr\u00ean PLCTalk<\/a>).<\/p>\n\n<div class=\"rich-callout-warning\">\n<span class=\"rich-callout-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86 1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"\/><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"\/><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"\/><\/svg><\/span>\n<p><strong>M\u1ed9t s\u1ee3i d\u00e2y b\u1ecb \u0111\u1ee9t n\u1eb1m trong m\u1ea1ch NO.<\/strong> V\u1edbi h\u1ec7 th\u1ed1ng kh\u00f4ng c\u00f3 d\u00e2y cho ch\u1ee9c n\u0103ng d\u1eebng, vi\u1ec7c \u0111\u1ee9t d\u00e2y s\u1ebd \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n ch\u00ednh x\u00e1c nh\u01b0 \u201cch\u01b0a \u0111\u1ea1t gi\u1edbi h\u1ea1n\u201d. M\u00e1y s\u1ebd ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u00f3 c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7. Trong h\u1ec7 th\u1ed1ng d\u00e2y NC, vi\u1ec7c \u0111\u1ee9t d\u00e2y kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c v\u1edbi t\u00ecnh tr\u1ea1ng c\u1ea3m bi\u1ebfn gi\u1edbi h\u1ea1n b\u1ecb k\u00edch ho\u1ea1t. D\u00f9 trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o, m\u1ea1ch \u0111i\u1ec7n c\u0169ng b\u1ecb ng\u1eaft v\u00e0 m\u00e1y s\u1ebd d\u1eebng l\u1ea1i.<\/p>\n<\/div>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>T\u00ecnh tr\u1ea1ng m\u1ea1ch \u0111i\u1ec7n<\/th><th>Wired NC (d\u1eebng c\u00f4ng vi\u1ec7c)<\/th><th>Wired NO (d\u1eebng c\u00f4ng vi\u1ec7c)<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>B\u00ecnh th\u01b0\u1eddng, ch\u01b0a \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n<\/td><td>\u0110i\u1ec1u khi\u1ec3n \/ \u0111\u1ea7u v\u00e0o = 1<\/td><td>M\u1edf \/ \u0111\u1ea7u v\u00e0o = 0<\/td><\/tr>\n<tr><td>\u0110\u00e3 \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n<\/td><td>M\u1edf, m\u00e1y d\u1eebng<\/td><td>\u0110\u00e3 \u0111\u00f3ng, m\u00e1y d\u1eebng ho\u1ea1t \u0111\u1ed9ng<\/td><\/tr>\n<tr><td><strong>D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng<\/strong><\/td><td><strong>M\u1edf, m\u00e1y d\u1eebng (an to\u00e0n)<\/strong><\/td><td><strong>M\u1edf, m\u00e1y v\u1eabn ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng (kh\u00f4ng b\u1ecb ph\u00e1t hi\u1ec7n)<\/strong><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>M\u1ed9t d\u00e2y b\u1ecb \u0111\u1ee9t kh\u00f4ng th\u1ec3 \u0111\u00e1nh l\u1eeba m\u1ea1ch NC. M\u1ea1ch s\u1ebd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. Ng\u01b0\u1ee3c l\u1ea1i, n\u00f3 l\u1ea1i \u0111\u00e1nh l\u1eeba ho\u00e0n to\u00e0n m\u1ea1ch NO: h\u1ec7 th\u1ed1ng cho r\u1eb1ng gi\u1edbi h\u1ea1n \u0111\u01a1n gi\u1ea3n l\u00e0 ch\u01b0a \u0111\u01b0\u1ee3c \u0111\u1ea1t \u0111\u1ebfn. S\u1ef1 b\u1ea5t \u0111\u1ed1i x\u1ee9ng n\u00e0y ch\u00ednh l\u00e0 l\u00fd do duy nh\u1ea5t \u1ee7ng h\u1ed9 vi\u1ec7c s\u1eed d\u1ee5ng m\u1ea1ch NC \u0111\u1ed1i v\u1edbi c\u00e1c gi\u1edbi h\u1ea1n li\u00ean quan \u0111\u1ebfn an to\u00e0n, v\u00e0 \u0111\u00e2y l\u00e0 d\u00f2ng duy nh\u1ea5t trong b\u1ea3ng n\u00e0y \u0111\u00e1ng \u0111\u1ec3 ghi nh\u1edb. <strong>M\u1ed9t d\u00e2y b\u1ecb \u0111\u1ee9t s\u1ebd chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 an to\u00e0n (fails safe) qua ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng \u0111\u00f3ng (NC) v\u00e0 chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 im l\u1eb7ng (fails silent) qua ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf (NO).<\/strong><\/p>\n\n\n<div class=\"bp-1-break\">\n<p class=\"bp-1-title\"><span class=\"bp-1-title-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M20 13c0 5-3.5 7.5-7.66 8.95a1 1 0 0 1-.67-.01C7.5 20.5 4 18 4 13V6a1 1 0 0 1 1-1c2 0 4.5-1.2 6.24-2.72a1.17 1.17 0 0 1 1.52 0C14.51 3.81 17 5 19 5a1 1 0 0 1 1 1z\"\/><path d=\"m9 12 2 2 4-4\"\/><\/svg><\/span>D\u00f2ng quy\u1ebft \u0111\u1ecbnh th\u00f4ng tin li\u00ean h\u1ec7 c\u1ee7a b\u1ea1n<\/p>\n<p class=\"bp-1-lede\">D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i l\u1ecfng \u2014 h\u00e0ng th\u1ee9 ba c\u1ee7a ma tr\u1eadn, h\u00ecnh ph\u00f3ng to.<\/p>\n<div class=\"bp-1-cols\">\n<div class=\"bp-1-col\">\n<p class=\"bp-1-col-head\"><span class=\"bp-1-col-ic bp-1-ic-ok\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><path d=\"m16 9-5.5 5.5L8 12\"\/><\/svg><\/span>Wired NC \u2014 t\u1ea1m d\u1eebng c\u00f4ng vi\u1ec7c<\/p>\n<p class=\"bp-1-ctx\">D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng<\/p>\n<p class=\"bp-1-mech\">C\u00f4ng t\u1eafc m\u1edf \u2014 \u0111i\u1ec7n \u00e1p \u0111\u1ea7u v\u00e0o gi\u1ea3m xu\u1ed1ng 0 V<\/p>\n<p class=\"bp-1-verdict bp-1-verdict-ok\">D\u1eebng an to\u00e0n<\/p>\n<\/div>\n<div class=\"bp-1-col bp-1-col-no\">\n<p class=\"bp-1-col-head\"><span class=\"bp-1-col-ic bp-1-ic-no\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><path d=\"m15 9-6 6\"\/><path d=\"m9 9 6 6\"\/><\/svg><\/span>Wired NO \u2014 ng\u1eebng c\u00f4ng vi\u1ec7c<\/p>\n<p class=\"bp-1-ctx\">D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng<\/p>\n<p class=\"bp-1-mech\">K\u00eanh li\u00ean l\u1ea1c v\u1eabn m\u1edf \u2014 th\u00f4ng b\u00e1o hi\u1ec3n th\u1ecb l\u00e0 \u201cch\u01b0a \u0111\u1ea1t gi\u1edbi h\u1ea1n\u201d<\/p>\n<p class=\"bp-1-verdict bp-1-verdict-no\">M\u00e1y v\u1eabn ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n<p>Tuy nhi\u00ean, NC kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u201ct\u1ed1t h\u01a1n\u201d. C\u00e1c m\u1ea1ch NC v\u1eabn d\u1eabn \u0111i\u1ec7n trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. Cu\u1ed9n d\u00e2y ti\u1ebfp \u0111i\u1ec3m \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n li\u00ean t\u1ee5c 24\/7 s\u1ebd g\u00e2y ra nhi\u1ec7t v\u00e0 m\u00e0i m\u00f2n, trong khi c\u00e1c t\u00e1c v\u1ee5 theo s\u1ef1 ki\u1ec7n th\u1ef1c s\u1ef1 c\u1ea7n NO. Nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n l\u00e0: l\u1ef1a ch\u1ecdn ti\u1ebfp \u0111i\u1ec3m ph\u00f9 h\u1ee3p v\u1edbi ch\u1ee9c n\u0103ng; v\u00e0 khi ch\u1ee9c n\u0103ng \u0111\u00f3 l\u00e0 \u201cd\u1eebng\u201d, h\u00e3y ch\u1ecdn ti\u1ebfp \u0111i\u1ec3m c\u00f3 <em>th\u1ea5t b\u1ea1i<\/em> c\u0169ng l\u00e0 m\u1ed9t tr\u1ea1m d\u1eebng.<\/p>\n<h3>Hai c\u00f4ng t\u1eafc tr\u00ean m\u1ed9t \u0111\u1ed9ng c\u01a1 \u0111\u1ea3o chi\u1ec1u<\/h3>\n<p>T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm li\u00ean quan \u201cc\u00e1ch n\u1ed1i d\u00e2y 2 c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n\u201d m\u00f4 t\u1ea3 m\u1ea1ch tr\u1ee5c hai chi\u1ec1u c\u1ed5 \u0111i\u1ec3n: m\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n \u1edf m\u1ed7i \u0111\u1ea7u h\u00e0nh tr\u00ecnh, m\u1ed7i c\u00f4ng t\u1eafc d\u1eebng chuy\u1ec3n \u0111\u1ed9ng theo h\u01b0\u1edbng ri\u00eang c\u1ee7a m\u00ecnh. C\u00f3 hai sai l\u1ea7m ch\u1ee7 y\u1ebfu \u1edf \u0111\u00e2y.<\/p>\n<p>Tr\u01b0\u1edbc h\u1ebft, m\u1ed7i \u0111\u1ea7u ch\u1ec9 \u0111\u01b0\u1ee3c d\u1eebng l\u1ea1i theo h\u01b0\u1edbng c\u1ee7a ch\u00ednh n\u00f3. M\u1ed9t thi\u1ebft k\u1ebf ph\u1ed5 bi\u1ebfn d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng d\u1eebng l\u1ea1i <em>t\u1ea5t c\u1ea3<\/em> chuy\u1ec3n \u0111\u1ed9ng khi m\u1ed9t trong hai c\u00f4ng t\u1eafc b\u1ecb k\u00edch ho\u1ea1t. L\u00fac \u0111\u00f3, tr\u1ee5c s\u1ebd d\u1eebng l\u1ea1i t\u1ea1i gi\u1edbi h\u1ea1n CCW v\u00e0 kh\u00f4ng bao gi\u1edd c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n theo chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 di chuy\u1ec3n ra kh\u1ecfi v\u1ecb tr\u00ed \u0111\u00f3. M\u1ed9t ng\u01b0\u1eddi d\u00f9ng PLCTalk \u0111ang l\u1eafp r\u00e1p tr\u1ee5c \u0111\u1ed9ng c\u01a1 b\u01b0\u1edbc \u0111\u00e3 g\u1eb7p ph\u1ea3i ch\u00ednh t\u00ecnh hu\u1ed1ng n\u00e0y v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c kh\u1eafc ph\u1ee5c ngay trong ch\u1ee7 \u0111\u1ec1 th\u1ea3o lu\u1eadn: c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n CW ng\u0103n chuy\u1ec3n \u0111\u1ed9ng theo chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3, c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n CCW ng\u0103n chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3, v\u00e0 logic ph\u1ea3i duy tr\u00ec h\u01b0\u1edbng tho\u00e1t (<a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">PLCTalk, C\u00e1ch \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n S7-1200<\/a>). Trong m\u1ed9t ch\u1ee7 \u0111\u1ec1 tr\u00ean r\/PLC v\u1ec1 m\u1ed9t c\u1eb7p b\u1ed9 truy\u1ec1n \u0111\u1ed9ng tuy\u1ebfn t\u00ednh ho\u1ea1t \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u nhau, c\u00e2u tr\u1ea3 l\u1eddi nh\u1eadn \u0111\u01b0\u1ee3c c\u0169ng gi\u1ed1ng nh\u01b0 v\u1eady: \u201cb\u1ea1n s\u1ebd c\u1ea7n hai m\u1ea1ch logic ri\u00eang bi\u1ec7t cho ch\u1ebf \u0111\u1ed9 m\u1edf r\u1ed9ng v\u00e0 thu h\u1ed3i\u2026 n\u00fat thu h\u1ed3i v\u1eabn s\u1ebd ho\u1ea1t \u0111\u1ed9ng\u201d (<a href=\"https:\/\/www.reddit.com\/r\/PLC\/comments\/1bhn3y0\/limit_switch_logic\/\">r\/PLC, M\u1ea1ch logic c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n<\/a>).<\/p>\n<p>Th\u1ee9 hai, h\u00e3y ch\u1ecdn c\u01a1 ch\u1ebf ti\u1ebfp \u0111i\u1ec3m theo t\u1eebng h\u01b0\u1edbng. NC \u0111\u01b0\u1ee3c n\u1ed1i ti\u1ebfp v\u1edbi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng c\u1ee7a t\u1eebng h\u01b0\u1edbng, do \u0111\u00f3 n\u1ebfu d\u00e2y b\u1ecb \u0111\u1ee9t, h\u01b0\u1edbng \u0111\u00f3 s\u1ebd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng, trong khi h\u01b0\u1edbng ng\u01b0\u1ee3c l\u1ea1i v\u1eabn ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng nh\u1edd m\u1ea1ch ri\u00eang c\u1ee7a n\u00f3. \u0110\u1ed1i v\u1edbi b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ea3o chi\u1ec1u d\u1ef1a tr\u00ean c\u00f4ng t\u1eafc t\u01a1, m\u1ed7i gi\u1edbi h\u1ea1n h\u00e0nh tr\u00ecnh \u0111\u01b0\u1ee3c n\u1ed1i ti\u1ebfp v\u1edbi cu\u1ed9n d\u00e2y c\u1ee7a h\u01b0\u1edbng t\u01b0\u01a1ng \u1ee9ng, v\u00e0 hai c\u01a1 ch\u1ebf kh\u00f3a li\u00ean \u0111\u1ed9ng c\u1ee7a c\u00f4ng t\u1eafc t\u01a1 s\u1ebd x\u1eed l\u00fd ph\u1ea7n c\u00f2n l\u1ea1i.<\/p>\n<p>M\u1ed9t l\u01b0u \u00fd n\u1eefa t\u1eeb th\u1ef1c t\u1ebf. N\u1ebfu c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n d\u1eebng \u0111\u1ed9ng c\u01a1 b\u1eb1ng c\u00e1ch ng\u1eaft m\u1ea1ch <strong>m\u1ea1ch cu\u1ed9n d\u00e2y c\u1ee7a c\u00f4ng t\u1eafc t\u01a1<\/strong>, c\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a c\u00f4ng t\u1eafc ch\u1ec9 d\u1eabn d\u00f2ng \u0111i\u1ec7n cho cu\u1ed9n d\u00e2y m\u00e0 th\u00f4i. \u0110\u00f3 l\u00e0 c\u00e1ch b\u1ed1 tr\u00ed \u0111\u00fang \u0111\u1eafn v\u00e0 \u0111\u1ea3m b\u1ea3o tu\u1ed5i th\u1ecd cao. Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu b\u1ea1n d\u1eabn d\u00f2ng \u0111i\u1ec7n c\u1ee7a \u0111\u1ed9ng c\u01a1 qua ch\u00ednh c\u00f4ng t\u1eafc, b\u1ea1n s\u1ebd chuy\u1ec3n t\u1eeb mi\u1ec1n t\u00edn hi\u1ec7u sang mi\u1ec1n c\u00f4ng su\u1ea5t, v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a ti\u1ebfp \u0111i\u1ec3m \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong ph\u1ea7n cu\u1ed1i c\u1ee7a b\u00e0i vi\u1ebft n\u00e0y s\u1ebd tr\u1edf th\u00e0nh y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh.<\/p>\n\n\n<div class=\"bp-cta-mid\">\n<div class=\"bp-cta-mid-copy\">\n<p class=\"bp-cta-mid-lead\">Tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng linh ki\u1ec7n thay th\u1ebf, h\u00e3y x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc ph\u00eda t\u1ea3i: d\u00f2ng \u0111i\u1ec7n c\u1ee7a \u0111\u1ed9ng c\u01a1 ho\u1eb7c cu\u1ed9n d\u00e2y, ho\u1eb7c t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o c\u1ee7a b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u2014 v\u00e0 xem li\u1ec7u n\u00f3 ph\u1ea3i d\u1eebng l\u1ea1i hay ph\u00e1t t\u00edn hi\u1ec7u.<\/p>\n<p class=\"bp-cta-mid-note\">C\u00e1c h\u00e0ng \u201cDC\u201d v\u00e0 \u201c\u0111i\u1ec7n c\u1ea3m\u201d tr\u00ean b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh lo\u1ea1i linh ki\u1ec7n.<\/p>\n<\/div>\n<a class=\"bp-cta-mid-btn\" href=\"https:\/\/www.omch.com\/vi\/contact\/\" target=\"_self\">Ki\u1ec3m tra th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt m\u1ea1ch ng\u1eaft<\/a>\n<\/div>\n\n<h2>K\u1ebft n\u1ed1i c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a PLC ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n<\/h2>\n<p>M\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u1ea5p t\u00edn hi\u1ec7u cho \u0111\u1ea7u v\u00e0o r\u1eddi r\u1ea1c c\u1ee7a PLC c\u0169ng c\u00f3 c\u1ea5u tr\u00fac ba c\u1ef1c t\u01b0\u01a1ng t\u1ef1, c\u1ed9ng th\u00eam m\u1ed9t k\u1ebft n\u1ed1i b\u1ed5 sung m\u00e0 ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng hay b\u1ecf qua: \u0111\u01b0\u1eddng d\u1eabn tr\u1edf v\u1ec1 c\u1ee7a \u0111\u1ea7u v\u00e0o.<\/p>\n<p>C\u00f4ng t\u1eafc l\u00e0 m\u1ed9t <strong>ti\u1ebfp x\u00fac kh\u00f4<\/strong>. Thi\u1ebft b\u1ecb n\u00e0y kh\u00f4ng cung c\u1ea5p hay ti\u00eau th\u1ee5 d\u00f2ng \u0111i\u1ec7n, m\u00e0 ch\u1ec9 c\u00f3 ch\u1ee9c n\u0103ng \u0111\u00f3ng v\u00e0 ng\u1eaft m\u1ea1ch. M\u1ea1ch \u0111\u01b0\u1ee3c ho\u00e0n th\u00e0nh nh\u1edd ngu\u1ed3n \u0111i\u1ec7n ri\u00eang c\u1ee7a th\u1ebb \u0111\u1ea7u v\u00e0o, v\u00e0 v\u1ea5n \u0111\u1ec1 duy nh\u1ea5t li\u00ean quan \u0111\u1ebfn vi\u1ec7c n\u1ed1i d\u00e2y l\u00e0 th\u1ebb c\u1ee7a b\u1ea1n y\u00eau c\u1ea7u b\u1ed1 tr\u00ed c\u1ef1c t\u00ednh nh\u01b0 th\u1ebf n\u00e0o.<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Ch\u1ecdn lo\u1ea1i th\u1ebb<\/th><th>D\u00f2ng \u0111i\u1ec7n +24 VDC \u0111i \u0111\u1ebfn \u0111\u00e2u<\/th><th>\u0110\u1ea7u ra c\u1ee7a c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi \u0111\u00e2u<\/th><th>V\u1ecb tr\u00ed \u0111\u1eb7t th\u1ebb th\u00f4ng th\u01b0\u1eddng<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>\u0110\u1ea7u v\u00e0o \u00e2m (d\u00f2ng \u0111i\u1ec7n ch\u1ea1y v\u00e0o \u0111\u1ea7u v\u00e0o; th\u01b0\u1eddng th\u1ea5y trong c\u00e1c b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ki\u1ec3u AB \u1edf B\u1eafc M\u1ef9)<\/td><td>\u0110\u1ebfn c\u1ed5ng COM<\/td><td>C\u1ed5ng NO ho\u1eb7c NC, sau \u0111\u00f3 n\u1ed1i v\u1edbi k\u00eanh \u0111\u1ea7u v\u00e0o<\/td><td>Th\u1ebb \u1edf ch\u1ebf \u0111\u1ed9 th\u00f4ng th\u01b0\u1eddng, sau \u0111\u00f3 chuy\u1ec3n sang 0 VDC (\u0111\u01b0\u1eddng \u0111i\u1ec7n \u00e2m)<\/td><\/tr>\n<tr><td>Ngu\u1ed3n c\u1ea5p \u0111\u1ea7u v\u00e0o (d\u00f2ng \u0111i\u1ec7n ch\u1ea1y ra kh\u1ecfi \u0111\u1ea7u v\u00e0o; th\u01b0\u1eddng th\u1ea5y trong c\u00e1c b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ki\u1ec3u Siemens)<\/td><td>\u0110\u1ebfn ph\u1ea7n th\u1ebb th\u00f4ng th\u01b0\u1eddng<\/td><td>C\u1ed5ng NO ho\u1eb7c NC, sau \u0111\u00f3 n\u1ed1i v\u1edbi k\u00eanh \u0111\u1ea7u v\u00e0o<\/td><td>Chuy\u1ec3n sang c\u1ed5ng COM, sau \u0111\u00f3 chuy\u1ec3n sang 0 VDC<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>D\u00f9 th\u1ebb c\u1ee7a b\u1ea1n s\u1eed d\u1ee5ng c\u00e1ch b\u1ed1 tr\u00ed n\u00e0o \u0111i ch\u0103ng n\u1eefa, m\u1ea1ch v\u00f2ng ph\u1ea3i \u0111\u01b0\u1ee3c kh\u00e9p k\u00edn: ngu\u1ed3n \u0111i\u1ec7n \u0111i ra kh\u1ecfi b\u1ed9 c\u1ea5p ngu\u1ed3n, \u0111i qua ti\u1ebfp \u0111i\u1ec3m c\u00f4ng t\u1eafc, \u0111i v\u00e0o \u0111\u1ea7u v\u00e0o, v\u00e0 quay tr\u1edf l\u1ea1i b\u1ed9 c\u1ea5p ngu\u1ed3n qua c\u1ef1c chung c\u1ee7a th\u1ebb \u0111\u1ea7u v\u00e0o. N\u1ebfu thi\u1ebfu \u0111o\u1ea1n cu\u1ed1i c\u00f9ng n\u00e0y, s\u1ebd kh\u00f4ng c\u00f3 g\u00ec x\u1ea3y ra. \u0110\u00e2y ch\u00ednh x\u00e1c l\u00e0 l\u1ed7i \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong ch\u1ee7 \u0111\u1ec1 PLCTalk \u1edf tr\u00ean. C\u00f4ng t\u1eafc \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n v\u00e0 n\u1ed1i d\u00e2y v\u1edbi \u0111\u1ea7u v\u00e0o \u0111\u00fang c\u00e1ch, nh\u01b0ng c\u1ef1c chung \u0111\u1ea7u v\u00e0o c\u1ee7a CPU kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi 0 V, do \u0111\u00f3 \u0111\u1ea7u v\u00e0o kh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i d\u00f9 c\u1ea7n g\u1ea1t \u0111\u01b0\u1ee3c nh\u1ea5n nh\u01b0 th\u1ebf n\u00e0o \u0111i ch\u0103ng n\u1eefa. C\u00e1ch kh\u1eafc ph\u1ee5c l\u00e0 n\u1ed1i m\u1ed9t d\u00e2y v\u00e0o c\u1ef1c chung \u0111\u1ea7u v\u00e0o.<\/p>\n<p>Sau khi ho\u00e0n t\u1ea5t vi\u1ec7c n\u1ed1i d\u00e2y v\u1eadt l\u00fd, ch\u01b0\u01a1ng tr\u00ecnh ph\u1ea3i \u0111\u1ecdc t\u00edn hi\u1ec7u t\u1eeb ti\u1ebfp \u0111i\u1ec3m theo \u0111\u00fang c\u00e1ch n\u00f3 \u0111\u01b0\u1ee3c n\u1ed1i d\u00e2y. N\u1ed1i d\u00e2y cho ti\u1ebfp \u0111i\u1ec3m NC (c\u00e1ch b\u1ed1 tr\u00ed d\u1eebng c\u00f4ng vi\u1ec7c \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb t\u1eeb ph\u1ea7n tr\u01b0\u1edbc), v\u00e0 t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o s\u1ebd \u1edf m\u1ee9c logic 1 trong qu\u00e1 tr\u00ecnh di chuy\u1ec3n b\u00ecnh th\u01b0\u1eddng. Khi gi\u1edbi h\u1ea1n b\u1ecb k\u00edch ho\u1ea1t ho\u1eb7c d\u00e2y b\u1ecb \u0111\u1ee9t, t\u00edn hi\u1ec7u s\u1ebd chuy\u1ec3n sang 0, khi\u1ebfn tr\u1ee5c d\u1eebng l\u1ea1i \u1edf b\u1ea5t k\u1ef3 h\u01b0\u1edbng n\u00e0o. L\u1eadp tr\u00ecnh bi\u1ebfn s\u1ed1 sao cho 1 = \u201cch\u01b0a \u0111\u1ea1t gi\u1edbi h\u1ea1n\u201d, v\u00e0 m\u1ecdi c\u01a1 ch\u1ebf kh\u00f3a li\u00ean \u0111\u1ed9ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng d\u1ef1a tr\u00ean bit \u0111\u00f3 s\u1ebd ho\u1ea1t \u0111\u1ed9ng theo nguy\u00ean t\u1eafc an to\u00e0n (failsafe).<\/p>\n<p>Hai chi ti\u1ebft th\u1ef1c t\u1ebf. Hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng ti\u1ebfp \u0111i\u1ec3m \u2014 hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00f3ng\/m\u1edf li\u00ean t\u1ee5c khi c\u00e1c ti\u1ebfp \u0111i\u1ec3m ch\u1ea1m v\u00e0o nhau l\u1ea7n \u0111\u1ea7u \u2014 th\u01b0\u1eddng k\u00e9o d\u00e0i t\u1eeb 1\u20135 ms, v\u00e0 h\u1ea7u h\u1ebft c\u00e1c bo m\u1ea1ch \u0111\u1ea7u v\u00e0o \u0111\u1ec1u c\u00f3 b\u1ed9 l\u1ecdc trong kho\u1ea3ng 4\u201312 ms. N\u1ebfu m\u00e1y c\u1ee7a b\u1ea1n ph\u00e1t hi\u1ec7n c\u00e1c xung \u1ea3o tr\u00ean tr\u1ee5c chuy\u1ec3n \u0111\u1ed9ng nhanh, h\u00e3y ki\u1ec3m tra th\u1eddi gian l\u1ecdc \u0111\u1ea7u v\u00e0o c\u1ee7a bo m\u1ea1ch tr\u01b0\u1edbc khi th\u00eam b\u1ed9 h\u1eb9n gi\u1edd ph\u1ea7n m\u1ec1m (<a href=\"https:\/\/plcprogramming.io\/blog\/limit-switch-explained\">PLCprogramming.io<\/a>). V\u00e0 nguy\u00ean l\u00fd ti\u1ebfp \u0111i\u1ec3m kh\u00f4 n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng nguy\u00ean v\u1eb9n cho vi \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n robot. \u0110i\u1ec3m kh\u00e1c bi\u1ec7t duy nh\u1ea5t n\u1eb1m \u1edf d\u1ea3i \u0111i\u1ec7n \u00e1p (5 V ho\u1eb7c 3,3 V thay v\u00ec 24 V), ch\u00ednh v\u00ec v\u1eady m\u00e0 c\u00e1c ch\u1ee7 \u0111\u1ec1 v\u1ec1 robot li\u00ean quan \u0111\u1ebfn RoboRIO v\u00e0 REV hub \u0111ang gi\u1ea3i quy\u1ebft c\u00f9ng m\u1ed9t v\u1ea5n \u0111\u1ec1 nh\u01b0 c\u00e1c ch\u1ee7 \u0111\u1ec1 v\u1ec1 PLC.<\/p>\n\n\n<div class=\"bp-2-loop\">\n<p class=\"bp-2-title\"><span class=\"bp-2-title-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M17 19a1 1 0 0 1-1-1v-2a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2a1 1 0 0 1-1 1z\"\/><path d=\"M17 21v-2\"\/><path d=\"M19 14V6.5a1 1 0 0 0-7 0v11a1 1 0 0 1-7 0V10\"\/><path d=\"M21 21v-2\"\/><path d=\"M3 5V3\"\/><path d=\"M4 10a2 2 0 0 1-2-2V6a1 1 0 0 1 1-1h4a1 1 0 0 1 1 1v2a2 2 0 0 1-2 2z\"\/><path d=\"M7 5V3\"\/><\/svg><\/span>M\u1ed9t v\u00f2ng, n\u0103m ch\u1eb7ng<\/p>\n<div class=\"bp-2-flow\">\n<span class=\"bp-2-chip bp-2-chip-key\">+24 V<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip\">ti\u1ebfp \u0111i\u1ec3m c\u00f4ng t\u1eafc<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip\">c\u1ed5ng \u0111\u1ea7u v\u00e0o<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip bp-2-chip-key\">th\u1ebb th\u00f4ng th\u01b0\u1eddng<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip\">0 V<\/span>\n<\/div>\n<p class=\"bp-2-foot\">M\u1ed7i l\u01b0\u1ee3t \u0111i \u0111\u1ec1u ph\u1ea3i c\u00f3 n\u01b0\u1edbc \u0111i \u2014 l\u00e1 b\u00e0i th\u00f4ng th\u01b0\u1eddng ch\u00ednh l\u00e0 th\u1ee9 m\u00e0 m\u1ecdi ng\u01b0\u1eddi th\u01b0\u1eddng b\u1ecf qua.<\/p>\n<\/div>\n\n<h2>Ki\u1ec3m tra h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n: Ki\u1ec3m tra b\u1eb1ng \u0111\u1ed3ng h\u1ed3 \u0111o v\u00e0 tra c\u1ee9u c\u00e1c tri\u1ec7u ch\u1ee9ng<\/h2>\n<p>Tr\u01b0\u1edbc khi c\u1ea5p ngu\u1ed3n cho b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n\u00e0o, ba b\u01b0\u1edbc ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c s\u1ebd gi\u1ea3i quy\u1ebft m\u1ecdi th\u1eafc m\u1eafc v\u1ec1 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n, bao g\u1ed3m c\u1ea3 vi\u1ec7c x\u00e1c \u0111\u1ecbnh \u201cc\u1ef1c n\u00e0o l\u00e0 c\u1ef1c n\u00e0o\u201d tr\u00ean m\u1ed9t c\u00f4ng t\u1eafc kh\u00f4ng c\u00f3 k\u00fd hi\u1ec7u:<\/p>\n<ol>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c c\u1ef1c (t\u1eaft ngu\u1ed3n).<\/strong> Khi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng \u1edf tr\u1ea1ng th\u00e1i ngh\u1ec9, ch\u1ebf \u0111\u1ed9 ki\u1ec3m tra li\u00ean t\u1ee5c c\u1ee7a m\u00e1y \u0111o s\u1ebd ph\u00e1t ra ti\u1ebfng b\u00edp khi n\u1ed1i gi\u1eefa COM v\u00e0 NC, v\u00e0 kh\u00f4ng ph\u00e1t ra ti\u1ebfng b\u00edp khi n\u1ed1i gi\u1eefa COM v\u00e0 NO. Nh\u1ea5n v\u00e0o b\u1ed9 truy\u1ec1n \u0111\u1ed9ng: ti\u1ebfng b\u00edp s\u1ebd chuy\u1ec3n sang \u0111o\u1ea1n COM\u2013NO. D\u00f9 nh\u00e3n ghi g\u00ec \u0111i ch\u0103ng n\u1eefa, m\u00e1y \u0111o l\u00fac n\u00e0y \u0111\u00e3 cho b\u1ea1n bi\u1ebft s\u1ef1 th\u1eadt.<\/li>\n<li><strong>Ki\u1ec3m tra xem c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng ch\u1eadp m\u1ea1ch kh\u00f4ng.<\/strong> H\u00e3y ki\u1ec3m tra xem c\u00f3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 s\u1ef1 d\u1eabn \u0111i\u1ec7n gi\u1eefa hai \u0111i\u1ec3m ti\u1ebfp x\u00fac c\u1ed1 \u0111\u1ecbnh hay kh\u00f4ng, v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 d\u1eabn \u0111i\u1ec7n t\u1eeb b\u1ea5t k\u1ef3 \u0111\u1ea7u n\u1ed1i n\u00e0o \u0111\u1ebfn th\u00e2n c\u00f4ng t\u1eafc (tr\u1eeb khi th\u00e2n c\u00f4ng t\u1eafc thu\u1ed9c lo\u1ea1i kim lo\u1ea1i n\u1ed1i \u0111\u1ea5t v\u00e0 c\u00f3 \u0111\u1ea7u n\u1ed1i \u0111\u1ea5t ri\u00eang).<\/li>\n<li><strong>Ki\u1ec3m tra m\u1ea1ch \u0111i\u1ec7n, \u0111\u00e3 c\u1ea5p ngu\u1ed3n.<\/strong> \u0110o ngang qua t\u1ea3i ho\u1eb7c t\u1ea1i \u0111\u1ea7u v\u00e0o. \u0110i\u1ec7n \u00e1p ho\u1eb7c tr\u1ea1ng th\u00e1i logic ph\u1ea3i thay \u0111\u1ed5i khi nh\u1ea5n b\u1ed9 truy\u1ec1n \u0111\u1ed9ng. Tr\u00ean \u0111\u1ea7u v\u00e0o PLC, \u0111\u00e8n LED \u0111\u1ea7u v\u00e0o c\u1ee7a bo m\u1ea1ch s\u1ebd l\u00e0 \u201cng\u01b0\u1eddi b\u1ea1n\u201d c\u1ee7a b\u1ea1n. \u0110\u00e8n n\u00e0y ph\u1ea3i s\u00e1ng \u1edf m\u1ed9t tr\u1ea1ng th\u00e1i v\u00e0 t\u1eaft khi c\u1ea7n g\u1ea1t k\u00edch ho\u1ea1t (<a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">c\u00e1ch kh\u1eafc ph\u1ee5c t\u01b0\u01a1ng t\u1ef1 \u0111\u00e3 k\u1ebft th\u00fac chu\u1ed7i th\u1ea3o lu\u1eadn tr\u00ean PLCTalk<\/a>).<\/li>\n<\/ol>\n<p>N\u1ebfu thi\u1ebft b\u1ecb v\u1eabn ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng b\u00ecnh th\u01b0\u1eddng, h\u00e3y tra c\u1ee9u c\u00e1c tri\u1ec7u ch\u1ee9ng thay v\u00ec xem l\u1ea1i s\u01a1 \u0111\u1ed3:<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Tri\u1ec7u ch\u1ee9ng<\/th><th>Nguy\u00ean nh\u00e2n c\u00f3 kh\u1ea3 n\u0103ng cao nh\u1ea5t<\/th><th>H\u00e0nh \u0111\u1ed9ng<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Kh\u00f4ng bao gi\u1edd ng\u1eebng \/ lu\u00f4n tr\u00e0n \u0111\u1ea7y n\u0103ng l\u01b0\u1ee3ng<\/td><td>\u0110\u00e3 k\u1ebft n\u1ed1i sai cho ch\u1ee9c n\u0103ng (NC v\u00e0 NO b\u1ecb \u0111\u1ea3o ng\u01b0\u1ee3c) ho\u1eb7c d\u00e2y chung b\u1ecb n\u1ed1i sai<\/td><td>X\u00e1c \u0111\u1ecbnh l\u1ea1i ch\u1ee9c n\u0103ng c\u1ee7a c\u00f4ng t\u1eafc (d\u1eebng hay s\u1ef1 ki\u1ec7n), sau \u0111\u00f3 ki\u1ec3m tra l\u1ea1i COM-NO-NC so v\u1edbi \u0111\u1ed3ng h\u1ed3 \u0111o<\/td><\/tr>\n<tr><td>\u0110\u00e8n LED \u0111\u1ea7u v\u00e0o \/ th\u1ebb kh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i<\/td><td>\u0110\u1ea7u v\u00e0o chung kh\u00f4ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i, ho\u1eb7c ch\u01b0\u01a1ng tr\u00ecnh \u0111\u1ecdc ti\u1ebfp \u0111i\u1ec3m ng\u01b0\u1ee3c l\u1ea1i<\/td><td>\u0110o \u0111i\u1ec7n \u00e1p t\u1ea1i \u0111\u1ea7u v\u00e0o; ho\u00e0n thi\u1ec7n m\u1ea1ch h\u1ed3i; ki\u1ec3m tra c\u00e1c ti\u1ebfp \u0111i\u1ec3m NO v\u00e0 NC trong m\u1ea1ch logic<\/td><\/tr>\n<tr><td>C\u00e1c s\u1ef1 c\u1ed1 gi\u00e1n \u0111o\u1ea1n ho\u1eb7c t\u00edn hi\u1ec7u \u1ea3o<\/td><td>\u0110\u1ea7u n\u1ed1i l\u1ecfng l\u1ebbo ho\u1eb7c hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng ti\u1ebfp x\u00fac v\u01b0\u1ee3t qua b\u1ed9 l\u1ecdc \u0111\u1ea7u v\u00e0o<\/td><td>Si\u1ebft ch\u1eb7t c\u00e1c \u0111\u1ea7u n\u1ed1i; t\u0103ng th\u1eddi gian l\u1ecdc \u0111\u1ea7u v\u00e0o (d\u1ea3i 4\u201312 ms)<\/td><\/tr>\n<tr><td>C\u00e1c \u0111i\u1ec3m ti\u1ebfp x\u00fac b\u1ecb ch\u00e1y ho\u1eb7c b\u1ecb h\u00e0n d\u00ednh<\/td><td>Gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c ti\u1ebfp x\u00fac th\u1ea5p h\u01a1n t\u1ea3i th\u1ef1c t\u1ebf (chuy\u1ec3n m\u1ea1ch m\u1ed9t chi\u1ec1u ho\u1eb7c chuy\u1ec3n m\u1ea1ch c\u1ea3m \u1ee9ng)<\/td><td>Chuy\u1ec3n sang ph\u1ea7n ngu\u1ed3n \u0111i\u1ec7n b\u00ean d\u01b0\u1edbi: c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c cao h\u01a1n ho\u1eb7c r\u01a1le trung gian<\/td><\/tr>\n<tr><td>V\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n<\/td><td>Kh\u00f4ng c\u00f3 d\u00e2y k\u1ebft n\u1ed1i n\u00e0o \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t cho ch\u1ee9c n\u0103ng d\u1eebng c\u00f4ng vi\u1ec7c, v\u00e0 d\u00e2y \u0111\u00e3 b\u1ecb \u0111\u1ee9t<\/td><td>C\u00e0i \u0111\u1eb7t l\u1ea1i d\u00e2y \u0111i\u1ec7n th\u00e0nh ch\u1ebf \u0111\u1ed9 NC. N\u1ebfu c\u00f3 d\u00e2y b\u1ecb \u0111\u1ee9t, m\u00e1y ph\u1ea3i ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>V\u00e0 khi m\u00e1y ho\u1ea1t \u0111\u1ed9ng nh\u01b0ng ph\u1ea7n m\u1ec1m kh\u00f4ng t\u01b0\u01a1ng th\u00edch v\u1edbi ph\u1ea7n c\u1ee9ng \u2014 t\u1ee9c l\u00e0 gi\u1edbi h\u1ea1n ph\u1ea7n c\u1ee9ng ho\u1ea1t \u0111\u1ed9ng trong khi gi\u1edbi h\u1ea1n ph\u1ea7n m\u1ec1m l\u1ea1i kh\u00f4ng \u2014 th\u00ec v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf ch\u01b0\u01a1ng tr\u00ecnh, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u1edf h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn. H\u00e3y gi\u1eef nguy\u00ean gi\u1edbi h\u1ea1n ph\u1ea7n m\u1ec1m v\u00e0 c\u00f4ng t\u1eafc v\u1eadt l\u00fd \u0111\u1ec3 \u0111o l\u01b0\u1eddng <em>c\u0169ng v\u1eady<\/em> \u0111i\u1ec3m, v\u00e0 ki\u1ec3m tra ch\u00fang c\u00f9ng nhau, ch\u1ee9 kh\u00f4ng ph\u1ea3i ri\u00eang r\u1ebd.<\/p>\n\n<h2>T\u1eeb s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111\u1ebfn m\u00e3 s\u1ea3n ph\u1ea9m: C\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ea7n ki\u1ec3m tra tr\u01b0\u1edbc khi mua<\/h2>\n<p>\u0110\u1ecdc s\u01a1 \u0111\u1ed3 theo chi\u1ec1u thu\u1eadn s\u1ebd gi\u00fap b\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c m\u1ed9t m\u1ea1ch \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng. \u0110\u1ecdc theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i s\u1ebd gi\u00fap b\u1ea1n t\u00ecm \u0111\u01b0\u1ee3c linh ki\u1ec7n thay th\u1ebf ph\u00f9 h\u1ee3p. \u0110\u00e2y l\u00e0 b\u01b0\u1edbc m\u00e0 h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 h\u01b0\u1edbng d\u1eabn \u0111\u1ea5u d\u00e2y n\u00e0o \u0111\u1ec1 c\u1eadp \u0111\u1ebfn, b\u1edfi v\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 l\u00fac m\u00e3 linh ki\u1ec7n, ch\u1ee9 kh\u00f4ng ph\u1ea3i tu\u1ed1c-n\u01a1-v\u00edt, m\u1edbi l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh.<\/p>\n<h3>H\u00e3y \u0111\u1ecdc c\u00e1c k\u00fd hi\u1ec7u li\u00ean h\u1ec7 tr\u01b0\u1edbc khi xem danh m\u1ee5c<\/h3>\n<p>M\u1ed7i s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n \u0111\u1ec1u th\u1ec3 hi\u1ec7n c\u00e1c y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt. H\u00e3y \u0111\u1ebfm s\u1ed1 bi\u1ec3u t\u01b0\u1ee3ng c\u00f4ng t\u1eafc. L\u01b0u \u00fd xem m\u1ed7i c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c v\u1ebd v\u1edbi ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf hay th\u01b0\u1eddng \u0111\u00f3ng (bi\u1ec3u t\u01b0\u1ee3ng s\u1ebd cho b\u1ea1n bi\u1ebft, v\u00ec v\u1eady \u0111\u1eebng \u0111o\u00e1n d\u1ef1a tr\u00ean n\u1ed9i dung v\u0103n b\u1ea3n). X\u00e1c \u0111\u1ecbnh xem m\u1ed7i c\u00f4ng t\u1eafc c\u00f3 ch\u1ee9c n\u0103ng chuy\u1ec3n m\u1ea1ch ngu\u1ed3n hay c\u1ea5p t\u00edn hi\u1ec7u v\u00e0o. Hai bi\u1ec3u t\u01b0\u1ee3ng c\u00f4ng t\u1eafc v\u00e0 m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng r\u01a1-le c\u00f3 ngh\u0129a l\u00e0 c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn hai m\u1ea1ch; m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng c\u00f4ng t\u1eafc c\u1ea5p t\u00edn hi\u1ec7u v\u00e0o cho PLC c\u00f3 ngh\u0129a l\u00e0 c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn t\u00edn hi\u1ec7u. Ph\u1ee5 t\u00f9ng b\u1ea1n mua ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi s\u1ed1 l\u01b0\u1ee3ng m\u1ea1ch v\u00e0 tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m m\u00e0 m\u1ed7i m\u1ea1ch y\u00eau c\u1ea7u.<\/p>\n<h3>\u0110\u00e1nh gi\u00e1 ti\u1ebfp x\u00fac: V\u1ea5n \u0111\u1ec1 sinh t\u1eed trong l\u0129nh v\u1ef1c \u0111i\u1ec7n n\u0103ng<\/h3>\n<p>N\u1ebfu c\u00f4ng t\u1eafc ng\u1eaft tr\u1ef1c ti\u1ebfp \u0111\u1ed9ng c\u01a1, \u0111i\u1ec7n t\u1eeb, cu\u1ed9n d\u00e2y c\u00f4ng t\u1eafc t\u01a1 ho\u1eb7c b\u00f3ng \u0111\u00e8n, th\u00ec th\u00f4ng s\u1ed1 \u0111\u1ecbnh m\u1ee9c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a n\u00f3 ch\u00ednh l\u00e0 gi\u1edbi h\u1ea1n an to\u00e0n c\u1ee7a to\u00e0n b\u1ed9 thi\u1ebft k\u1ebf. Ba nguy\u00ean t\u1eafc sau \u0111\u00e2y gi\u00fap ng\u01b0\u1eddi mua tr\u00e1nh \u0111\u01b0\u1ee3c r\u1eafc r\u1ed1i:<\/p>\n<ul>\n<li><strong>Ch\u1ec9 s\u1ed1 n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ea3i, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t con s\u1ed1 c\u1ed1 \u0111\u1ecbnh.<\/strong> M\u1ed9t c\u00f4ng t\u1eafc c\u00f3 th\u1ec3 ng\u1eaft \u0111\u01b0\u1ee3c t\u1ea3i AC \u0111i\u1ec7n tr\u1edf 10 A m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng c\u00f3 th\u1ec3 kh\u00f4ng ng\u1eaft \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n 2 A c\u1ee7a \u0111\u1ed9ng c\u01a1 DC. Do d\u00f2ng \u0111i\u1ec7n DC kh\u00f4ng c\u00f3 \u0111i\u1ec3m giao c\u1eaft tr\u1ee5c \u0111\u1ec3 d\u1eadp t\u1eaft h\u1ed3 quang, n\u00ean c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t th\u01b0\u1eddng h\u1ea1 m\u1ee9c \u0111\u1ecbnh m\u1ee9c cho d\u00f2ng \u0111i\u1ec7n DC xu\u1ed1ng th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi m\u1ee9c \u0111\u1ecbnh m\u1ee9c cho d\u00f2ng \u0111i\u1ec7n AC.<\/li>\n<li><strong>C\u00e1c con s\u1ed1 th\u1ef1c t\u1ebf tr\u00f4ng nh\u01b0 th\u1ebf n\u00e0y.<\/strong> M\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n ki\u1ec3u con l\u0103n-c\u1ea7n g\u1ea1t ch\u1ecbu t\u1ea3i n\u1eb7ng \u0111i\u1ec3n h\u00ecnh c\u00f3 \u0111\u1ecbnh m\u1ee9c 10 A \u1edf 250 VAC \u0111\u1ed1i v\u1edbi t\u1ea3i \u0111i\u1ec7n tr\u1edf (c\u1ea3 NC v\u00e0 NO), 3 A \u1edf 480 VAC v\u00e0 ch\u1ec9 0,25 A \u1edf 250 VDC (<a href=\"https:\/\/www.omch.com\/vi\/az-7100\/\">V\u00ed d\u1ee5 v\u1ec1 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt AZ-7100<\/a>). M\u1ed9t b\u1ed9 truy\u1ec1n \u0111\u1ed9ng d\u1ecdc nh\u1ecf g\u1ecdn thu\u1ed9c c\u00f9ng d\u00f2ng s\u1ea3n ph\u1ea9m trong danh m\u1ee5c n\u00e0y c\u00f3 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c 5 A \u1edf \u0111i\u1ec7n \u00e1p 250 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf) v\u00e0 ch\u1ec9 0,2 A \u1edf \u0111i\u1ec7n \u00e1p 250 VDC (<a href=\"https:\/\/www.omch.com\/vi\/tz-8108\/\">V\u00ed d\u1ee5 v\u1ec1 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a TZ-8108<\/a>). N\u1ebfu t\u1ea3i c\u1ee7a b\u1ea1n l\u00e0 m\u1ed9t \u0111i\u1ec7n t\u1eeb m\u1ed9t chi\u1ec1u ho\u1eb7c m\u1ed9t \u0111\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u nh\u1ecf, h\u00e3y so s\u00e1nh v\u1edbi <strong>Chuy\u00ean m\u1ee5c DC<\/strong>, ch\u1ee9 kh\u00f4ng ph\u1ea3i con s\u1ed1 250 VAC \u0111\u01b0\u1ee3c ghi tr\u00ean nh\u00e3n.<\/li>\n<li><strong>C\u00e1c t\u1ea3i c\u1ea3m \u1ee9ng c\u1ea7n gi\u1ea3m c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c ho\u1eb7c s\u1eed d\u1ee5ng r\u01a1le trung gian.<\/strong> Cu\u1ed9n d\u00e2y c\u1ee7a c\u00f4ng t\u1eafc \u0111i\u1ec7n \u0111\u1ed9ng c\u01a1 v\u00e0 cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb l\u00e0 c\u00e1c linh ki\u1ec7n c\u1ea3m \u1ee9ng. Khi ng\u1eaft m\u1ea1ch, ch\u00fang t\u1ea1o ra tia l\u1eeda \u0111i\u1ec7n v\u00e0 l\u00e0m h\u00e0n d\u00ednh c\u00e1c ti\u1ebfp \u0111i\u1ec3m, khi\u1ebfn c\u00e1c ti\u1ebfp \u0111i\u1ec3m n\u00e0y c\u00f3 tu\u1ed5i th\u1ecd cao h\u01a1n c\u1ea3 tu\u1ed5i th\u1ecd c\u1ee7a b\u1ea1n khi ho\u1ea1t \u0111\u1ed9ng v\u1edbi t\u1ea3i \u0111i\u1ec7n tr\u1edf (<a href=\"https:\/\/plcprogramming.io\/blog\/limit-switch-explained\">PLCprogramming.io<\/a>). C\u00e1ch l\u00e0m ti\u00eau chu\u1ea9n l\u00e0: \u0111\u1ec3 c\u00f4ng t\u1eafc \u0111i\u1ec1u khi\u1ec3n cu\u1ed9n d\u00e2y c\u1ee7a r\u01a1le ho\u1eb7c c\u00f4ng t\u1eafc t\u01a1, v\u00e0 \u0111\u1ec3 ch\u00fang th\u1ef1c hi\u1ec7n vi\u1ec7c chuy\u1ec3n m\u1ea1ch ngu\u1ed3n. V\u1ec1 m\u1eb7t c\u01a1 h\u1ecdc, \u0111\u00e2y c\u0169ng ch\u00ednh l\u00e0 v\u1ecb tr\u00ed ph\u00f9 h\u1ee3p nh\u1ea5t \u0111\u1ec3 l\u1eafp \u0111\u1eb7t c\u00f4ng t\u1eafc ngay t\u1eeb \u0111\u1ea7u.<\/li>\n<\/ul>\n\n\n<div class=\"bp-3-ratings\">\n<p class=\"bp-3-title\"><span class=\"bp-3-title-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"13 2 3 14 12 14 11 22 21 10 12 10 13 2\"\/><\/svg><\/span>T\u1ed5ng quan v\u1ec1 c\u00e1c m\u1ee9c \u0111\u1ecbnh m\u1ee9c ti\u1ebfp x\u00fac \u2014 xem c\u1ed9t DC<\/p>\n<div class=\"bp-3-grid\">\n<div class=\"bp-3-unit\">\n<p class=\"bp-3-unit-head\">C\u1ea7n g\u1ea1t con l\u0103n ch\u1ecbu t\u1ea3i n\u1eb7ng<\/p>\n<p class=\"bp-3-line\"><span>250 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf)<\/span><span class=\"bp-3-num\">10 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>480 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf)<\/span><span class=\"bp-3-num\">3 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>250 VDC<\/span><span class=\"bp-3-num\">0,25 A<\/span><\/p>\n<\/div>\n<div class=\"bp-3-unit\">\n<p class=\"bp-3-unit-head\">Thi\u1ebft k\u1ebf nh\u1ecf g\u1ecdn v\u1edbi c\u01a1 ch\u1ebf di chuy\u1ec3n d\u1ecdc<\/p>\n<p class=\"bp-3-line\"><span>250 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf)<\/span><span class=\"bp-3-num\">5 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>125 volt m\u1ed9t chi\u1ec1u<\/span><span class=\"bp-3-num\">0,4 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>250 VDC<\/span><span class=\"bp-3-num\">0,2 A<\/span><\/p>\n<\/div>\n<\/div>\n<p class=\"bp-3-foot\">Cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb v\u00e0 \u0111\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u: h\u00e3y so s\u00e1nh v\u1edbi c\u1ed9t \u201cDC\u201d, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u1edbi ti\u00eau \u0111\u1ec1 \u201c250 VAC\u201d.<\/p>\n<\/div>\n\n<h3>Cu\u1ed9c s\u1ed1ng, b\u1ed9 truy\u1ec1n \u0111\u1ed9ng v\u00e0 l\u1ed9 tr\u00ecnh thay th\u1ebf<\/h3>\n<p>Tr\u00ean b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f3 hai ch\u1ec9 s\u1ed1 v\u1ec1 tu\u1ed5i th\u1ecd, v\u00e0 hai ch\u1ec9 s\u1ed1 n\u00e0y kh\u00f4ng th\u1ec3 thay th\u1ebf cho nhau. <strong>Tu\u1ed5i th\u1ecd \u0111i\u1ec7n<\/strong>, s\u1ed1 l\u1ea7n ho\u1ea1t \u0111\u1ed9ng \u1edf m\u1ee9c t\u1ea3i \u0111\u1ecbnh m\u1ee9c t\u1ed1i \u0111a, l\u00e0 con s\u1ed1 d\u00f9ng \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n kho\u1ea3ng th\u1eddi gian thay th\u1ebf; \u0111\u1ed1i v\u1edbi c\u00e1c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u00f4ng nghi\u1ec7p, d\u1ef1 ki\u1ebfn s\u1ebd thu\u1ed9c lo\u1ea1i c\u00f3 tu\u1ed5i th\u1ecd 500.000 l\u1ea7n ho\u1ea1t \u0111\u1ed9ng. <strong>Tu\u1ed5i th\u1ecd c\u01a1 h\u1ecdc<\/strong>, trong tr\u01b0\u1eddng h\u1ee3p chuy\u1ec3n m\u1ea1ch kh\u00f4ng t\u1ea3i, con s\u1ed1 n\u00e0y cao h\u01a1n r\u1ea5t nhi\u1ec1u, th\u01b0\u1eddng l\u00ean \u0111\u1ebfn h\u00e0ng tri\u1ec7u l\u1ea7n. N\u1ebfu b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u1ec9 n\u00eau con s\u1ed1 c\u01a1 h\u1ecdc t\u00ednh b\u1eb1ng h\u00e0ng tri\u1ec7u, h\u00e3y coi \u0111\u00f3 l\u00e0 th\u00f4ng tin qu\u1ea3ng c\u00e1o cho \u0111\u1ebfn khi c\u00f3 th\u00f4ng s\u1ed1 v\u1ec1 tu\u1ed5i th\u1ecd \u0111i\u1ec7n \u0111\u01b0\u1ee3c ghi k\u00e8m b\u00ean c\u1ea1nh.<\/p>\n<p>B\u1ed9 truy\u1ec1n \u0111\u1ed9ng quy\u1ebft \u0111\u1ecbnh c\u00e1ch th\u1ee9c c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t: c\u1ea7n g\u1ea1t con l\u0103n d\u00e0nh cho c\u01a1 c\u1ea5u cam v\u00e0 d\u1ed1c (v\u00e0 l\u00e0 ki\u1ec3u ph\u1ed5 bi\u1ebfn nh\u1ea5t trong c\u00f4ng nghi\u1ec7p), p\u00edt-t\u00f4ng d\u00e0nh cho ti\u1ebfp x\u00fac tr\u1ef1c di\u1ec7n, v\u00e0 \u0111\u1ea7u d\u00f2 d\u1ea1ng s\u1ee3i d\u00e0nh cho c\u1ea3m bi\u1ebfn \u0111a h\u01b0\u1edbng nh\u1eb9. Nhi\u1ec1u th\u00e2n c\u00f4ng t\u1eafc h\u1ed7 tr\u1ee3 \u0111\u1ea7u c\u00f3 th\u1ec3 thay th\u1ebf, do \u0111\u00f3 khi c\u1ea7n thay th\u1ebf, ng\u01b0\u1eddi ta th\u01b0\u1eddng ch\u1ec9 thay \u0111\u1ea7u thay v\u00ec thay c\u1ea3 c\u00f4ng t\u1eafc. H\u00e3y ki\u1ec3m tra c\u00e1ch l\u1eafp \u0111\u1eb7t v\u00e0 h\u01b0\u1edbng ho\u1ea1t \u0111\u1ed9ng tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng.<\/p>\n<p>Vi\u1ec7c thay th\u1ebf sau \u0111\u00f3 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n theo hai h\u01b0\u1edbng: s\u1eed d\u1ee5ng m\u00e3 s\u1ea3n ph\u1ea9m gi\u1ed1ng h\u1ec7t ho\u1eb7c thay th\u1ebf b\u1eb1ng s\u1ea3n ph\u1ea9m c\u00f3 c\u00e1c th\u00f4ng s\u1ed1 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng. \u0110\u1ed1i v\u1edbi ph\u01b0\u01a1ng \u00e1n thay th\u1ebf, h\u00e3y ki\u1ec3m tra <strong>s\u1ed1 l\u01b0\u1ee3ng m\u1ea1ch v\u00e0 tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m, \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c v\u00e0 lo\u1ea1i d\u00f2ng \u0111i\u1ec7n (AC so v\u1edbi DC), tu\u1ed5i th\u1ecd \u0111i\u1ec7n, c\u1ea5p b\u1ea3o v\u1ec7 IP cho m\u00f4i tr\u01b0\u1eddng, v\u00e0 ki\u1ec3u b\u1ed9 truy\u1ec1n \u0111\u1ed9ng<\/strong> kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u trong s\u01a1 \u0111\u1ed3. Khi c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn \u0111\u1ea7u v\u00e0o m\u1ee9c t\u00edn hi\u1ec7u, \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n h\u1ea7u nh\u01b0 kh\u00f4ng quan tr\u1ecdng, trong khi c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i l\u1ea1i r\u1ea5t quan tr\u1ecdng.<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Vai tr\u00f2 c\u1ee7a m\u1ea1ch<\/th><th>C\u00e1c th\u00f4ng s\u1ed1 quy\u1ebft \u0111\u1ecbnh chi ti\u1ebft<\/th><th>Khi c\u00e1c gi\u1ea3 \u0111\u1ecbnh c\u1ee7a vai tr\u00f2 n\u00e0y kh\u00f4ng c\u00f2n \u0111\u00fang n\u1eefa<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Ch\u1ebf \u0111\u1ed9 Power-through (c\u00f4ng t\u1eafc ng\u1eaft ngu\u1ed3n c\u1ea5p cho t\u1ea3i)<\/td><td>\u0110i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c, d\u00f2ng xoay chi\u1ec1u (AC) so v\u1edbi d\u00f2ng m\u1ed9t chi\u1ec1u (DC), tu\u1ed5i th\u1ecd \u0111i\u1ec7n<\/td><td>T\u1ea3i c\u1ea3m \u1ee9ng m\u1ed9t chi\u1ec1u ho\u1eb7c t\u1ea3i c\u00f3 d\u00f2ng kh\u1edfi \u0111\u1ed9ng cao: chuy\u1ec3n sang s\u1eed d\u1ee5ng r\u01a1le\/c\u00f4ng t\u1eafc t\u01a1 \u0111\u1ec3 chuy\u1ec3n m\u1ea1ch. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a c\u00f4ng t\u1eafc kh\u00f4ng c\u00f2n \u0111\u1ee7 \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u<\/td><\/tr>\n<tr><td>M\u1ee9c t\u00edn hi\u1ec7u (c\u00f4ng t\u1eafc c\u1ea5p t\u00edn hi\u1ec7u v\u00e0o \u0111\u1ea7u v\u00e0o c\u1ee7a PLC\/b\u1ed9 \u0111i\u1ec1u khi\u1ec3n)<\/td><td>C\u1ea5u h\u00ecnh \u0111\u1ea7u cu\u1ed1i (NO\/NC\/COM), tu\u1ed5i th\u1ecd c\u01a1 h\u1ecdc, ki\u1ec3u b\u1ed9 truy\u1ec1n \u0111\u1ed9ng<\/td><td>N\u1ebfu c\u00f4ng t\u1eafc \u0111\u00f3 c\u0169ng ph\u1ea3i ng\u1eaft ngu\u1ed3n \u0111i\u1ec7n. M\u1ed9t b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecbu t\u00edn hi\u1ec7u kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecbu t\u1ea3i \u0111i\u1ec7n<\/td><\/tr>\n<tr><td>Ph\u1ea3n h\u1ed3i hai m\u1ea1ch (v\u1ecb tr\u00ed c\u1eeda\/van)<\/td><td>S\u1ed1 l\u01b0\u1ee3ng m\u1ea1ch \u0111\u1ed9c l\u1eadp, tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m tr\u00ean m\u1ed7i m\u1ea1ch<\/td><td>Kh\u00f4ng gian h\u1eb9p ho\u1eb7c t\u1ea7n s\u1ed1 r\u1ea5t cao: c\u00f4ng t\u1eafc vi m\u00f4 ho\u1eb7c c\u1ea3m bi\u1ebfn kh\u00f4ng ti\u1ebfp x\u00fac c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p h\u01a1n<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h2>\u0110i\u1ec1u n\u00e0y c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i \u0111ang nh\u1eadp kho c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n thay th\u1ebf<\/h2>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i v\u00e0 b\u00e1n bu\u00f4n ho\u1ea1t \u0111\u1ed9ng trong l\u0129nh v\u1ef1c s\u1eeda ch\u1eefa v\u00e0 b\u1ea3o tr\u00ec, c\u00e1c s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n \u1edf tr\u00ean kh\u00f4ng ch\u1ec9 l\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o; ch\u00fang ch\u00ednh l\u00e0 c\u00e2u h\u1ecfi \u0111\u1ea7u ti\u00ean trong m\u1ecdi cu\u1ed9c g\u1ecdi y\u00eau c\u1ea7u h\u1ed7 tr\u1ee3. Khi kh\u00e1ch h\u00e0ng n\u00f3i \u201cc\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n b\u1ecb h\u1ecfng\u201d, c\u00e2u tr\u1ea3 l\u1eddi h\u1eefu \u00edch kh\u00f4ng ph\u1ea3i l\u00e0 \u201cm\u1eabu n\u00e0o?\u201d m\u00e0 l\u00e0 \u201c<strong>C\u00f4ng t\u1eafc n\u00e0y c\u00f3 \u0111\u01b0\u1ee3c n\u1ed1i tr\u1ef1c ti\u1ebfp v\u1edbi \u0111\u1ed9ng c\u01a1 hay cu\u1ed9n d\u00e2y kh\u00f4ng, hay n\u00f3 c\u1ea5p ngu\u1ed3n cho b\u1ed9 \u0111i\u1ec1u khi\u1ec3n? V\u00e0 n\u00f3 c\u00f3 c\u1ea7n ph\u1ea3i ng\u1eaft ho\u1ea1t \u0111\u1ed9ng hay ch\u1ec9 \u0111\u1ec3 ph\u00e1t t\u00edn hi\u1ec7u?<\/strong>\u201d C\u00e2u h\u1ecfi \u0111\u00f3 s\u1ebd h\u01b0\u1edbng d\u1eabn kh\u00e1ch h\u00e0ng \u0111\u1ebfn b\u01b0\u1edbc ki\u1ec3m tra s\u1ef1 c\u1ed1 ph\u00f9 h\u1ee3p. Kh\u00e1ch h\u00e0ng \u1edf ph\u00eda ngu\u1ed3n \u0111i\u1ec7n c\u00f3 nguy c\u01a1 g\u1eb7p s\u1ef1 c\u1ed1 li\u00ean quan \u0111\u1ebfn th\u00f4ng s\u1ed1 \u0111\u1ecbnh m\u1ee9c ti\u1ebfp \u0111i\u1ec3m (h\u00e0ng \u201cti\u1ebfp \u0111i\u1ec3m b\u1ecb ch\u00e1y\u201d trong b\u1ea3ng tri\u1ec7u ch\u1ee9ng). Kh\u00e1ch h\u00e0ng \u1edf ph\u00eda t\u00edn hi\u1ec7u c\u00f3 nguy c\u01a1 g\u1eb7p s\u1ef1 c\u1ed1 li\u00ean quan \u0111\u1ebfn tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m v\u00e0 c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i (h\u00e0ng \u201ckh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i\u201d).<\/p>\n<p>\u0110\u00f3 c\u0169ng l\u00e0 l\u00fd do gi\u1ea3i th\u00edch cho c\u00e1ch th\u1ee9c qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho. M\u1ed9t n\u1ec1n t\u1ea3ng SPDT ch\u1ecbu t\u1ea3i n\u1eb7ng, c\u00f9ng m\u1ed9t d\u00f2ng th\u00e2n s\u1ea3n ph\u1ea9m \u00e1p d\u1ee5ng cho c\u1ea3 \u0111\u1ea7u \u0111i\u1ec1u khi\u1ec3n d\u1ea1ng con l\u0103n v\u00e0 d\u1ea1ng p\u00edt-t\u00f4ng, v\u1edbi c\u1ea3 hai tr\u1ea1ng th\u00e1i NO v\u00e0 NC \u0111\u1ec1u \u0111\u01b0\u1ee3c cung c\u1ea5p, gi\u00fap \u0111\u00e1p \u1ee9ng c\u1ea3 hai ch\u1ee9c n\u0103ng m\u1ea1ch t\u1eeb m\u1ed9t d\u00f2ng s\u1ea3n ph\u1ea9m duy nh\u1ea5t. Kh\u00e1ch h\u00e0ng s\u1eed d\u1ee5ng cho m\u1ea1ch ngu\u1ed3n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u1ee9ng minh cho tuy\u00ean b\u1ed1 \u0111\u00f3. Kh\u00e1ch h\u00e0ng s\u1eed d\u1ee5ng cho m\u1ea1ch t\u00edn hi\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i. C\u00e1c trang danh m\u1ee5c s\u1ea3n ph\u1ea9m c\u00f4ng b\u1ed1 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 tu\u1ed5i th\u1ecd ngay b\u00ean c\u1ea1nh m\u00e3 s\u1ea3n ph\u1ea9m, gi\u1ed1ng nh\u01b0 c\u00e1ch c\u00e1c b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt l\u00e0m, cho ph\u00e9p nh\u00e0 ph\u00e2n ph\u1ed1i tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi v\u1ec1 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt m\u00e0 kh\u00f4ng c\u1ea7n g\u1ecdi \u0111i\u1ec7n. \u0110\u00f3 ch\u00ednh x\u00e1c l\u00e0 kho\u1ea3ng tr\u1ed1ng d\u1ecbch v\u1ee5 m\u00e0 n\u1ed9i dung s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y hi\u1ec7n t\u1ea1i tr\u00ean web \u0111\u1ec3 l\u1ea1i: c\u00e1c h\u01b0\u1edbng d\u1eabn d\u1ea1y b\u1ea1n c\u00e1ch \u0111\u1ea5u d\u00e2y, nh\u01b0ng h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 h\u01b0\u1edbng d\u1eabn n\u00e0o cho b\u1ea1n bi\u1ebft n\u00ean y\u00eau c\u1ea7u g\u00ec t\u1eeb linh ki\u1ec7n m\u00e0 b\u1ea1n s\u1eafp mua. Quy\u1ebft \u0111\u1ecbnh cu\u1ed1i c\u00f9ng v\u1eabn thu\u1ed9c v\u1ec1 m\u1ea1ch \u0111i\u1ec7n c\u1ee7a ch\u00ednh kh\u00e1ch h\u00e0ng. B\u00e0i vi\u1ebft n\u00e0y cung c\u1ea5p cho b\u1ea1n nh\u1eefng c\u00e2u h\u1ecfi c\u1ea7n \u0111\u1eb7t ra, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u00e2u tr\u1ea3 l\u1eddi thay m\u1eb7t h\u1ecd. C\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i c\u00f3 th\u1ec3 \u0111\u1eb7t nh\u1eefng c\u00e2u h\u1ecfi n\u00e0y b\u1eb1ng ng\u00f4n ng\u1eef c\u1ee7a kh\u00e1ch h\u00e0ng s\u1ebd bi\u1ebfn m\u1ed9t c\u00e2u h\u1ecfi v\u1ec1 \u0111\u1ea5u d\u00e2y th\u00e0nh m\u1ed9t giao d\u1ecbch b\u00e1n h\u00e0ng.<\/p>\n<p><em>N\u1ebfu qu\u00fd kh\u00e1ch \u0111ang so s\u00e1nh c\u00e1c d\u00f2ng c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 mu\u1ed1n tham kh\u1ea3o b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f3 ghi r\u00f5 th\u00f4ng s\u1ed1 \u0111\u1ecbnh m\u1ee9c ti\u1ebfp \u0111i\u1ec3m, tu\u1ed5i th\u1ecd v\u00e0 c\u00e1c t\u00f9y ch\u1ecdn b\u1ed9 truy\u1ec1n \u0111\u1ed9ng (\u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 ch\u00ednh th\u1ee9c ch\u1ee9 kh\u00f4ng ph\u1ea3i ch\u1ec9 l\u00e0 b\u00e1o gi\u00e1), danh m\u1ee5c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u1ee7a OMCH li\u1ec7t k\u00ea c\u00e1c d\u00f2ng s\u1ea3n ph\u1ea9m ch\u1ecbu t\u1ea3i n\u1eb7ng v\u00e0 d\u00f2ng s\u1ea3n ph\u1ea9m nh\u1ecf g\u1ecdn k\u00e8m theo b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u1ea7y \u0111\u1ee7. Qu\u00fd kh\u00e1ch c\u00f3 th\u1ec3 tham kh\u1ea3o danh m\u1ee5c s\u1ea3n ph\u1ea9m ho\u1eb7c g\u1eedi chi ti\u1ebft m\u1ea1ch \u0111i\u1ec7n c\u1ee7a m\u00ecnh \u0111\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t ph\u00f9 h\u1ee3p v\u1edbi s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y.<\/em><\/p>\n\n\n<div class=\"bp-cta-end\">\n<p class=\"bp-cta-end-title\"><span class=\"bp-cta-end-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.536 21.686a.5.5 0 0 0 .937-.024l6.5-19a.496.496 0 0 0-.635-.635l-19 6.5a.5.5 0 0 0-.024.937l7.93 3.18a2 2 0 0 1 1.112 1.11z\"\/><path d=\"m21.854 2.147-10.94 10.939\"\/><\/svg><\/span>G\u1eedi c\u00e2u h\u1ecfi v\u1ec1 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n \u2014 Nh\u1eadn c\u00f4ng t\u1eafc ph\u00f9 h\u1ee3p<\/p>\n<p class=\"bp-cta-end-sub\">Vui l\u00f2ng cho ch\u00fang t\u00f4i bi\u1ebft c\u00f4ng t\u1eafc n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng d\u1eebng \u0111\u1ed9ng c\u01a1 tr\u1ef1c ti\u1ebfp hay cung c\u1ea5p t\u00edn hi\u1ec7u cho \u0111\u1ea7u v\u00e0o b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, v\u00e0 li\u1ec7u c\u00f4ng t\u1eafc n\u00e0y c\u00f3 b\u1eaft bu\u1ed9c ph\u1ea3i d\u1eebng \u0111\u1ed9ng c\u01a1 hay ch\u1ec9 c\u1ea7n ph\u00e1t t\u00edn hi\u1ec7u. C\u00e1c k\u1ef9 s\u01b0 c\u1ee7a ch\u00fang t\u00f4i s\u1ebd ki\u1ec3m tra th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a ti\u1ebfp \u0111i\u1ec3m v\u00e0 c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i d\u1ef1a tr\u00ean s\u01a1 \u0111\u1ed3 m\u1ea1ch c\u1ee7a qu\u00fd kh\u00e1ch tr\u01b0\u1edbc khi qu\u00fd kh\u00e1ch \u0111\u1eb7t h\u00e0ng.<\/p>\n<a class=\"bp-cta-end-btn\" href=\"https:\/\/www.omch.com\/vi\/contact\/\" target=\"_self\">Nh\u1eadn b\u00e1o gi\u00e1 ph\u00f9 h\u1ee3p v\u1edbi h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n<\/a>\n<\/div>\n\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol class=\"bd-refs\">\n<li><a href=\"https:\/\/plcprogramming.io\/blog\/limit-switch-explained\">PLCprogramming.io. \u201cGi\u1ea3i th\u00edch v\u1ec1 c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n | C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng + C\u00e1ch \u0111\u1ea5u d\u00e2y PLC.\u201d Th\u00e1ng 6 n\u0103m 2026.<\/a><\/li>\n<li><a href=\"https:\/\/tameson.com\/pages\/limit-switch\">Tameson. \u201cH\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n.\u201d Th\u00e1ng 1 n\u0103m 2024.<\/a><\/li>\n<li><a href=\"https:\/\/www.chiefdelphi.com\/t\/wiring-this-limit-switch\/492163\">Chief Delphi. \u201cC\u00e1ch n\u1ed1i d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n n\u00e0y\u201d (ch\u1ee7 \u0111\u1ec1 tr\u00ean di\u1ec5n \u0111\u00e0n FIRST Robotics). Th\u00e1ng 2 n\u0103m 2025.<\/a><\/li>\n<li><a href=\"https:\/\/forum.arduino.cc\/t\/how-to-wire-limit-switch-safely-and-read-switch-status\/1430294\">Di\u1ec5n \u0111\u00e0n Arduino. \u201cC\u00e1ch \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n an to\u00e0n v\u00e0 \u0111\u1ecdc tr\u1ea1ng th\u00e1i c\u00f4ng t\u1eafc.\u201d Th\u00e1ng 2 n\u0103m 2026.<\/a><\/li>\n<li><a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">PLCTalk. \u201cC\u00e1ch \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n S7-1200.\u201d Th\u00e1ng 6 n\u0103m 2022.<\/a><\/li>\n<li><a href=\"https:\/\/www.reddit.com\/r\/PLC\/comments\/1bhn3y0\/limit_switch_logic\/\">r\/PLC. \u201cLogic c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n.\u201d Th\u00e1ng 3 n\u0103m 2024.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/limit-switch\/\">OMCH. Danh m\u1ee5c s\u1ea3n ph\u1ea9m \u201cC\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n\u201d.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/az-7100\/\">OMCH. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u1ea7n g\u1ea1t con l\u0103n ch\u1ecbu t\u1ea3i n\u1eb7ng \u201cAZ-7100\u201d.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/tz-8108\/\">OMCH. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n nh\u1ecf g\u1ecdn \u201cTZ-8108\u201d.<\/a><\/li>\n<\/ol>\n<\/article>\n<\/div>\n\n<\/body><\/html>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>S\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n: C\u00e1ch \u0111\u1ea5u d\u00e2y c\u00e1c c\u1ef1c NO, NC v\u00e0 c\u1ef1c chung trong m\u1ea1ch \u0111\u1ed9ng c\u01a1, PLC v\u00e0 m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n. S\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n tr\u00f4ng c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n: ba c\u1ef1c, v\u00e0i \u0111\u01b0\u1eddng d\u00e2y, th\u1ebf l\u00e0 xong. Tuy nhi\u00ean, c\u00f9ng m\u1ed9t c\u00f4ng t\u1eafc ba c\u1ef1c n\u00e0y l\u1ea1i \u0111\u01b0\u1ee3c \u0111\u1ea5u d\u00e2y theo ba c\u00e1ch ho\u00e0n to\u00e0n kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o m\u1ea1ch m\u00e0 n\u00f3 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t: \u0111\u1ea5u tr\u1ef1c ti\u1ebfp v\u00e0o cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 ho\u1eb7c cu\u1ed9n d\u00e2y ti\u1ebfp \u0111i\u1ec3m, [\u2026]<\/p>","protected":false},"author":4,"featured_media":12351,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Limit Switch Wiring Diagram: NO, NC & Common Guide","_seopress_titles_desc":"Learn how to wire limit switches in motor, PLC, and control circuits, identify NO, NC, and common terminals, and test each connection safely.","_seopress_robots_index":"","footnotes":""},"categories":[79],"tags":[],"class_list":["post-12347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mmlblog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/comments?post=12347"}],"version-history":[{"count":1,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12347\/revisions"}],"predecessor-version":[{"id":12352,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12347\/revisions\/12352"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media\/12351"}],"wp:attachment":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media?parent=12347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/categories?post=12347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/tags?post=12347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":12347,"date":"2026-09-11T07:50:14","date_gmt":"2026-09-11T07:50:14","guid":{"rendered":"https:\/\/www.omch.com\/?p=12347"},"modified":"2026-09-11T07:50:16","modified_gmt":"2026-09-11T07:50:16","slug":"limit-switch-wiring-diagram","status":"publish","type":"post","link":"https:\/\/www.omch.com\/vi\/limit-switch-wiring-diagram\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n: C\u00e1ch n\u1ed1i d\u00e2y c\u00e1c \u0111\u1ea7u n\u1ed1i NO, NC v\u00e0 \u0111\u1ea7u n\u1ed1i chung"},"content":{"rendered":"\n\n\n\nS\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n: C\u00e1ch n\u1ed1i d\u00e2y c\u00e1c ti\u1ebfp \u0111i\u1ec3m NO, NC v\u00e0 d\u00e2y chung trong m\u1ea1ch \u0111\u1ed9ng c\u01a1, PLC v\u00e0 m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n<\/title>\n<\/head>\n<body>\n\n<div class=\"bd-post\">\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Manrope:wght@400;600;700&family=Roboto:wght@600;700&display=swap');\n\n.bd-post {\n \/* ---- color tokens: single source = design-plan Color Palette ---- *\/\n --body-bg: #FFFFFF;\n --text-primary: #333333;\n --text-secondary: #6E6E6E;\n --heading-ink: #000000;\n --accent: #479DE2;\n --accent-deep: #2A76B4;\n --accent-hot: #FD9649;\n --accent-hot-deep: #B85C17;\n --navy: #0D3972;\n --inverse-bg: #1E1E1E;\n --inverse-text: #FFFFFF;\n --inv-secondary: #B3B3B3;\n --card-bg: #F4F8FC;\n --card-border: #E0E0E0;\n --divider-dark: #444444;\n --btn-white: #FFFFFF;\n --btn-ink: #1E1E1E;\n \/* ---- spacing system: FIXED STANDARD ---- *\/\n --prose-width: 680px;\n --gap-attach: 16px;\n --gap-normal: 32px;\n --gap-section: 48px;\n --pad-compact: 16px;\n --pad-standard: 24px;\n font-family: \"Manrope\", sans-serif;\n font-size: 16px;\n font-weight: 400;\n line-height: 1.6;\n color: var(--text-primary);\n background: var(--body-bg);\n box-sizing: border-box;\n padding: 40px;\n max-width: 100%;\n}\n.bd-post a { overflow-wrap: anywhere; word-break: break-word; }\n.bd-post p, .bd-post li { overflow-wrap: break-word; }\n.bd-post .bd-post-article { max-width: var(--prose-width); margin: 0 auto; }\n.bd-post [class*=\"bp-\"], .bd-post [class*=\"rich-\"] { box-sizing: border-box; }\n\n\/* ---- prose spacing (FIXED STANDARD) ---- *\/\n.bd-post p { margin: 0 0 1em; }\n.bd-post h2 { font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 34px; line-height: 1.2; color: var(--heading-ink); margin: 48px 0 16px; }\n.bd-post h3 { font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 24px; line-height: 1.25; color: var(--heading-ink); margin: 32px 0 12px; }\n.bd-post ul, .bd-post ol { margin: 0 0 1em; padding-left: 1.5em; }\n.bd-post ul li::marker { color: var(--accent-deep); }\n.bd-post li { margin-bottom: 0.5em; }\n.bd-post strong { font-weight: 700; }\n\n\/* ---- anchors: permit-list forms only ---- *\/\n.bd-post p a, .bd-post li a, .bd-post blockquote a, .bd-post td a { color: var(--accent-deep); text-decoration: underline; text-decoration-color: currentColor; }\n\n\/* ---- block outer margins: direct children, specific classes ---- *\/\n.bd-post-article > .bp-1-break,\n.bd-post-article > .bp-3-ratings,\n.bd-post-article > .rich-table-wrap,\n.bd-post-article > .rich-callout-warning { margin: var(--gap-normal) 0; }\n.bd-post-article > .bp-2-loop { margin: var(--gap-section) 0 var(--gap-normal); }\n.bd-post-article > .bp-cta-mid { margin: var(--gap-section) 0 0; }\n.bd-post-article > .bp-cta-end { margin: var(--gap-section) 0 0; }\n\n\/* ---- BP-1: broken-wire signature block (high, solid inverse) ---- *\/\n.bp-1-break { background: var(--inverse-bg); color: var(--inverse-text); padding: var(--pad-standard); }\n.bp-1-title { margin: 0 0 6px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 18px; line-height: 1.3; color: var(--inverse-text); }\n.bp-1-title .bp-1-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent); }\n.bp-1-lede { margin: 0 0 14px; font-size: 14px; line-height: 1.5; color: var(--inv-secondary); }\n.bp-1-cols { display: flex; align-items: stretch; gap: 24px; }\n.bp-1-col { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; gap: 6px; border-top: 2px solid var(--accent); padding-top: 12px; }\n.bp-1-col-no { border-top-color: var(--accent-hot); }\n.bp-1-cols > .bp-1-col + .bp-1-col { border-left: 1px solid var(--divider-dark); padding-left: 24px; }\n.bp-1-col-head { display: flex; align-items: center; gap: 8px; margin: 0 0 2px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 13px; line-height: 1.4; letter-spacing: 0.4px; text-transform: uppercase; color: var(--inv-secondary); }\n.bp-1-col-head .bp-1-col-ic { display: inline-flex; flex: 0 0 auto; }\n.bp-1-col-head .bp-1-ic-ok { color: var(--accent); }\n.bp-1-col-head .bp-1-ic-no { color: var(--accent-hot); }\n.bp-1-ctx { margin: 0; font-size: 13px; line-height: 1.5; color: var(--inv-secondary); }\n.bp-1-mech { margin: 0; font-size: 15px; line-height: 1.55; color: var(--inverse-text); }\n.bp-1-verdict { margin: 6px 0 0; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 20px; line-height: 1.3; }\n.bp-1-verdict-ok { color: var(--accent); }\n.bp-1-verdict-no { color: var(--accent-hot); }\n\n\/* ---- BP-2: closed-loop flow (medium, tint + border) ---- *\/\n.bp-2-loop { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-compact); }\n.bp-2-title { margin: 0 0 10px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 15px; line-height: 1.4; color: var(--text-primary); }\n.bp-2-title .bp-2-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.bp-2-flow { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }\n.bp-2-chip { flex: 0 1 auto; background: var(--body-bg); border: 1px solid var(--card-border); border-radius: 6px; padding: 6px 12px; font-size: 14px; line-height: 1.4; color: var(--text-primary); }\n.bp-2-chip.bp-2-chip-key { font-weight: 700; }\n.bp-2-arrow { display: inline-flex; flex: 0 0 auto; align-items: center; justify-content: center; width: 20px; color: var(--accent-deep); }\n.bp-2-foot { margin: 10px 0 0; font-size: 13px; line-height: 1.5; color: var(--text-secondary); }\n\n\/* ---- BP-3: contact ratings reference card (medium, tint + border) ---- *\/\n.bp-3-ratings { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-standard); }\n.bp-3-title { margin: 0 0 12px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 16px; line-height: 1.4; color: var(--text-primary); }\n.bp-3-title .bp-3-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.bp-3-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }\n.bp-3-unit { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; gap: 6px; }\n.bp-3-unit-head { margin: 0; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 13px; line-height: 1.4; letter-spacing: 0.4px; text-transform: uppercase; color: var(--accent-deep); }\n.bp-3-line { margin: 0; display: flex; align-items: baseline; justify-content: space-between; gap: 8px; font-size: 14px; line-height: 1.5; color: var(--text-secondary); }\n.bp-3-line .bp-3-num { font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 17px; line-height: 1.3; color: var(--accent-deep); }\n.bp-3-foot { margin: 12px 0 0; border-top: 1px solid var(--card-border); padding-top: 10px; font-size: 13px; line-height: 1.5; color: var(--text-secondary); }\n\n\/* ---- Rich: comparison tables + native prose tables ---- *\/\n.rich-table-wrap { overflow-x: auto; }\n.rich-table { width: 100%; border-collapse: collapse; }\n.rich-table th { background: var(--card-bg); color: var(--navy); font-family: \"Roboto\", sans-serif; font-weight: 700; text-align: left; padding: 12px 14px; border-bottom: 2px solid var(--navy); }\n.rich-table td { padding: 12px 14px; border-bottom: 1px solid var(--card-border); color: var(--text-primary); vertical-align: top; }\n.rich-table tbody tr:nth-child(even) td { background: var(--card-bg); }\n.rich-table tbody tr td:first-child { font-weight: 600; }\n\n\/* ---- Rich: warning callout (low: tint + border + left bar) ---- *\/\n.rich-callout-warning { display: flex; align-items: flex-start; gap: 12px; background: var(--card-bg); border: 1px solid var(--card-border); border-left: 4px solid var(--accent-hot-deep); padding: var(--pad-compact); }\n.rich-callout-warning .rich-callout-icon { display: inline-flex; flex: 0 0 auto; color: var(--accent-hot-deep); margin-top: 2px; }\n.rich-callout-warning p { margin: 0; font-size: 15px; line-height: 1.6; color: var(--text-primary); }\n\n\/* ---- BP-cta-mid (banner, tint + border) ---- *\/\n.bp-cta-mid { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-standard); display: flex; flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; text-align: left; }\n.bp-cta-mid-copy { display: flex; flex-direction: column; gap: 4px; max-width: 430px; }\n.bp-cta-mid-lead { margin: 0; font-size: 16px; line-height: 1.55; color: var(--text-primary); }\n.bp-cta-mid-lead strong { font-weight: 700; }\n.bp-cta-mid-note { margin: 0; font-size: 13px; line-height: 1.5; color: var(--text-secondary); }\n.bp-cta-mid-btn { display: inline-block; flex: 0 0 auto; background: var(--accent-hot); color: var(--btn-ink); font-family: \"Manrope\", sans-serif; font-weight: 700; font-size: 15px; line-height: 1.2; text-decoration: none; border-radius: 6px; padding: 12px 24px; }\n\n\/* ---- BP-cta-end ---- *\/\n.bp-cta-end { background: var(--inverse-bg); color: var(--inverse-text); padding: var(--pad-standard); display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }\n.bp-cta-end-title { margin: 0; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 22px; line-height: 1.3; color: var(--inverse-text); }\n.bp-cta-end-title .bp-cta-end-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent); }\n.bp-cta-end-title .bp-cta-end-icon svg { width: 28px; height: 28px; }\n.bp-cta-end-sub { margin: 0; font-size: 16px; line-height: 1.6; color: var(--inv-secondary); max-width: 520px; }\n.bp-cta-end-btn { display: inline-block; background: var(--accent-hot); color: var(--btn-ink); font-family: \"Manrope\", sans-serif; font-weight: 700; font-size: 16px; line-height: 1.2; text-decoration: none; border-radius: 6px; padding: 14px 28px; }\n\n\/* ---- References ---- *\/\n.bd-refs { font-size: 14px; color: var(--text-secondary); }\n.bd-refs li { margin-bottom: 0.5em; }\n\n\/* ---- sanctioned motion (gated, no loops, hover only on designed blocks) ---- *\/\n@media (prefers-reduced-motion: no-preference) {\n .bd-post h2 { transition: color 0.2s ease-out, transform 0.2s ease-out; transform-origin: left; }\n .bd-post h2:hover { color: var(--accent-deep); transform: scale(1.02); }\n .bd-post p a, .bd-post li a { transition: color 0.2s ease-out; }\n .bd-post p a:hover, .bd-post li a:hover { color: var(--accent-hot-deep); }\n .bp-cta-end-btn { transition: background 0.2s ease-out, color 0.2s ease-out, transform 0.2s ease-out; }\n .bp-cta-end-btn:hover { background: var(--btn-white); color: var(--navy); transform: translateY(-1px); }\n .bp-cta-mid-btn { transition: background 0.2s ease-out, color 0.2s ease-out, transform 0.2s ease-out; }\n .bp-cta-mid-btn:hover { background: var(--navy); color: var(--btn-white); transform: translateY(-1px); }\n}\n\n\/* ---- mobile (\u2264768): mechanical adaptation ---- *\/\n@media (max-width: 768px) {\n .bd-post { padding: 16px; }\n .bd-post h2 { font-size: 26px; margin-top: 32px; }\n .bd-post h3 { font-size: 20px; margin-top: 24px; }\n .bp-cta-end-title .bp-cta-end-icon svg { width: 21px; height: 21px; }\n .bp-1-cols { flex-direction: column; gap: 16px; }\n .bp-1-cols > .bp-1-col + .bp-1-col { border-left: 0; padding-left: 0; }\n .bp-cta-mid { flex-direction: column; align-items: flex-start; text-align: left; }\n .bp-2-flow { flex-direction: column; align-items: center; gap: 2px; }\n .bp-2-flow .bp-2-arrow svg { transform: rotate(90deg); }\n .bp-3-grid { grid-template-columns: 1fr; }\n}\n@media (max-width: 767px) {\n .bd-post h2 { font-size: 26px; }\n .bd-post h3 { font-size: 20px; }\n}\n<\/style>\n<article class=\"bd-post-article\">\n<p>S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n tr\u00f4ng c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n: ba c\u1ef1c, v\u00e0i \u0111\u01b0\u1eddng d\u00e2y, th\u1ebf l\u00e0 xong. Tuy nhi\u00ean, c\u00f9ng m\u1ed9t c\u00f4ng t\u1eafc ba c\u1ef1c n\u00e0y l\u1ea1i \u0111\u01b0\u1ee3c n\u1ed1i theo ba c\u00e1ch ho\u00e0n to\u00e0n kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o m\u1ea1ch \u0111i\u1ec7n m\u00e0 n\u00f3 n\u1eb1m trong: n\u1ed1i tr\u1ef1c ti\u1ebfp v\u00e0o cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 ho\u1eb7c cu\u1ed9n d\u00e2y c\u00f4ng t\u1eafc t\u01a1, n\u1ed1i v\u00e0o th\u1ebb \u0111\u1ea7u v\u00e0o PLC, ho\u1eb7c n\u1ed1i song song v\u1edbi m\u1ed9t c\u1eb7p c\u00f4ng t\u1eafc tr\u00ean tr\u1ee5c \u0111\u1ea3o chi\u1ec1u. N\u1ebfu n\u1ed1i sai, s\u1ef1 c\u1ed1 s\u1ebd kh\u00f4ng bao gi\u1edd ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 \u201cn\u00f3 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng\u201d. M\u00e0 l\u00e0 <em>t\u1ec7 h\u01a1n<\/em>: m\u00e1y v\u1eabn ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng trong khi l\u1ebd ra ph\u1ea3i d\u1eebng l\u1ea1i r\u1ed3i.<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1c c\u00e1ch \u0111\u1ea5u d\u00e2y cho m\u1ed9t c\u00f4ng t\u1eafc, c\u00e1ch ch\u1ecdn lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m (NO hay NC) v\u00e0 l\u00fd do t\u1ea1i sao s\u1ef1 l\u1ef1a ch\u1ecdn \u0111\u00f3 quy\u1ebft \u0111\u1ecbnh h\u01b0\u1edbng s\u1ef1 c\u1ed1 c\u1ee7a m\u1ea1ch \u0111i\u1ec7n, c\u00e1ch k\u1ebft n\u1ed1i c\u00f9ng m\u1ed9t c\u00f4ng t\u1eafc v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a PLC ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, c\u00e1ch ki\u1ec3m tra k\u1ebft qu\u1ea3 c\u00f4ng vi\u1ec7c b\u1eb1ng \u0111\u1ed3ng h\u1ed3 \u0111o, v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 nh\u1eefng th\u00f4ng s\u1ed1 c\u1ea7n ki\u1ec3m tra khi mua s\u1ea3n ph\u1ea9m thay th\u1ebf. \u0110\u1ebfn cu\u1ed1i h\u01b0\u1edbng d\u1eabn, b\u1ea1n s\u1ebd c\u00f3 th\u1ec3 \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i: t\u1eeb m\u1ea1ch \u0111i\u1ec7n \u0111\u1ebfn m\u00e3 s\u1ea3n ph\u1ea9m.<\/p>\n\n<h2>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n l\u00e0 g\u00ec \u2014 v\u00e0 b\u00e0i vi\u1ebft n\u00e0y kh\u00f4ng \u0111\u1ec1 c\u1eadp \u0111\u1ebfn \u0111i\u1ec1u g\u00ec<\/h2>\n<p>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb c\u01a1 \u0111i\u1ec7n c\u00f3 b\u1ed9 truy\u1ec1n \u0111\u1ed9ng (p\u00edt-t\u00f4ng, c\u1ea7n l\u0103n, thanh g\u1ea1t ho\u1eb7c tr\u1ee5c quay) v\u00e0 m\u1ed9t b\u1ed9 ti\u1ebfp \u0111i\u1ec3m b\u00ean trong. Khi m\u1ed9t b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u00e1y m\u00f3c, ch\u1eb3ng h\u1ea1n nh\u01b0 pallet b\u0103ng t\u1ea3i, xe \u0111\u1ea9y ho\u1eb7c c\u1eeda, \u0111\u1ea9y b\u1ed9 truy\u1ec1n \u0111\u1ed9ng v\u01b0\u1ee3t qua \u0111i\u1ec3m c\u00e0i \u0111\u1eb7t, c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng t\u1ee9c th\u1eddi b\u00ean trong s\u1ebd \u0111\u1ea3o chi\u1ec1u c\u00e1c ti\u1ebfp \u0111i\u1ec3m trong v\u00f2ng ch\u01b0a \u0111\u1ea7y m\u1ed9t mili gi\u00e2y, t\u1eeb \u0111\u00f3 m\u1edf ho\u1eb7c \u0111\u00f3ng m\u1ea1ch \u0111i\u1ec7n. T\u00ean g\u1ecdi n\u00e0y xu\u1ea5t ph\u00e1t t\u1eeb ch\u1ee9c n\u0103ng ban \u0111\u1ea7u: \u0111\u00e1nh d\u1ea5u gi\u1edbi h\u1ea1n v\u1eadt l\u00fd c\u1ee7a h\u00e0nh tr\u00ecnh \u0111\u1ec3 m\u00e1y m\u00f3c d\u1eebng l\u1ea1i ho\u1eb7c \u0111\u1ea3o chi\u1ec1u tr\u01b0\u1edbc khi g\u00e2y h\u01b0 h\u1ecfng cho ch\u00ednh n\u00f3 ho\u1eb7c t\u1ea3i tr\u1ecdng.<\/p>\n<p>Tr\u01b0\u1edbc khi xem c\u00e1c s\u01a1 \u0111\u1ed3, xin l\u00e0m r\u00f5 m\u1ed9t \u0111i\u1ec1u \u0111\u1ec3 c\u00e1c b\u1ea1n kh\u00f4ng ph\u1ea3i l\u00e3ng ph\u00ed c\u1ea3 m\u1ed9t bu\u1ed5i chi\u1ec1u: b\u00e0i vi\u1ebft n\u00e0y n\u00f3i v\u1ec1 <strong>c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n ti\u1ebfp x\u00fac c\u01a1 h\u1ecdc<\/strong>, c\u00e1c c\u00f4ng t\u1eafc c\u00f4ng nghi\u1ec7p c\u00f3 \u0111\u1ea7u n\u1ed1i v\u00edt d\u00f9ng cho h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec1u khi\u1ec3n. \u201cC\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n\u201d m\u00e0 b\u1ea1n th\u1ea5y b\u00ean trong l\u00f2 s\u01b0\u1edfi ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u1eeda gara l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb kh\u00e1c (c\u00f4ng t\u1eafc nhi\u1ec7t ho\u1eb7c c\u00f4ng t\u1eafc v\u1ecb tr\u00ed c\u1eeda) v\u1edbi c\u00e1ch \u0111\u1ea5u d\u00e2y kh\u00e1c. N\u1ebfu b\u1ea1n \u0111ang s\u1eeda ch\u1eefa l\u00f2 s\u01b0\u1edfi ho\u1eb7c \u0111\u1ed9ng c\u01a1 c\u1eeda, c\u00e1c s\u01a1 \u0111\u1ed3 d\u01b0\u1edbi \u0111\u00e2y s\u1ebd kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00f4ng t\u1eafc c\u01a1 \u0111i\u1ec7n, m\u1ecdi v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n \u0111\u1ec1u t\u1eadp trung v\u00e0o ba c\u1ef1c, v\u00e0 ch\u1ec9 c\u1ea7n quy\u1ebft \u0111\u1ecbnh m\u1ed9t \u0111i\u1ec1u: ti\u1ebfp \u0111i\u1ec3m n\u00e0o s\u1ebd \u0111\u1ea3m nh\u1eadn ch\u1ee9c n\u0103ng ng\u1eaft m\u1ea1ch.<\/p>\n\n<h2>Ba \u0111\u1ea7u n\u1ed1i: C\u00e1c h\u00ecnh th\u1ee9c n\u1ed1i d\u00e2y c\u1ee7a m\u1ed9t c\u00f4ng t\u1eafc (2 d\u00e2y \/ 3 ch\u00e2n \/ 4 \u0111\u1ea7u n\u1ed1i)<\/h2>\n<p>M\u1ed7i kh\u1ed1i ti\u1ebfp \u0111i\u1ec3m c\u1ee7a c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n ti\u00eau chu\u1ea9n \u0111\u1ec1u c\u00f3 ba \u0111\u1ea7u n\u1ed1i: <strong>COM<\/strong> (th\u01b0\u1eddng g\u1eb7p), <strong>KH\u00d4NG<\/strong> (th\u01b0\u1eddng m\u1edf), v\u00e0 <strong>NC<\/strong> (th\u01b0\u1eddng \u0111\u00f3ng).<\/p>\n<ul>\n<li>Khi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng \u1edf tr\u1ea1ng th\u00e1i ngh\u1ec9, m\u1ea1ch COM\u2013NC \u1edf tr\u1ea1ng th\u00e1i \u0111\u00f3ng li\u00ean t\u1ee5c v\u00e0 m\u1ea1ch COM\u2013NO \u1edf tr\u1ea1ng th\u00e1i h\u1edf.<\/li>\n<li>Khi nh\u1ea5n v\u00e0o b\u1ed9 truy\u1ec1n \u0111\u1ed9ng, c\u00e1c ti\u1ebfp \u0111i\u1ec3m s\u1ebd chuy\u1ec3n \u0111\u1ed5i \u0111\u1ed3ng th\u1eddi: ti\u1ebfp \u0111i\u1ec3m COM\u2013NC m\u1edf ra v\u00e0 ti\u1ebfp \u0111i\u1ec3m COM\u2013NO \u0111\u00f3ng l\u1ea1i.<\/li>\n<\/ul>\n<p>V\u00ec ti\u1ebfp \u0111i\u1ec3m \u0111\u1ed9ng chuy\u1ec3n \u0111\u1ed5i gi\u1eefa hai ti\u1ebfp \u0111i\u1ec3m c\u1ed1 \u0111\u1ecbnh, n\u00ean c\u00f4ng t\u1eafc n\u00e0y l\u00e0 thi\u1ebft b\u1ecb m\u1ed9t c\u1ef1c hai v\u1ecb tr\u00ed (SPDT). B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ri\u00eang ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf (NO), ri\u00eang ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng \u0111\u00f3ng (NC) ho\u1eb7c c\u1ea3 hai. Hai m\u1ea1ch \u0111i\u1ec7n \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i c\u00f9ng m\u1ed9t l\u00fac b\u1edfi m\u1ed9t b\u1ed9 truy\u1ec1n \u0111\u1ed9ng.<\/p>\n<p>Ch\u00ednh kh\u1ed1i n\u1ed1i ba c\u1ef1c \u0111\u00f3 l\u00e0 \u0111i\u1ec1u m\u00e0 ng\u01b0\u1eddi ta th\u01b0\u1eddng g\u1ecdi l\u00e0 c\u00e1c d\u1ea1ng \u201c2 d\u00e2y\u201d, \u201c3 d\u00e2y\u201d v\u00e0 \u201c4 d\u00e2y\u201d, v\u00e0 thu\u1eadt ng\u1eef n\u00e0y c\u00f3 \u00fd ngh\u0129a r\u1ed9ng h\u01a1n so v\u1edbi v\u1ebb b\u1ec1 ngo\u00e0i:<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Nh\u1eefng g\u00ec b\u1ea1n c\u00f3<\/th><th>\u00dd ngh\u0129a c\u1ee7a \u0111i\u1ec1u \u0111\u00f3 l\u00e0 g\u00ec<\/th><th>C\u00e1ch \u0111\u1ea5u d\u00e2y th\u00f4ng th\u01b0\u1eddng<\/th><th>Ph\u00f9 h\u1ee3p nh\u1ea5t cho<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>2 d\u00e2y (hai \u0111i\u1ec3m k\u1ebft n\u1ed1i)<\/td><td>M\u1ed9t ti\u1ebfp \u0111i\u1ec3m c\u1ee7a kh\u1ed1i COM\/NO\/NC, ho\u1eb7c m\u1ed9t c\u00f4ng t\u1eafc 2 c\u1ef1c<\/td><td>C\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c n\u1ed1i d\u00e2y theo m\u1ea1ch n\u1ed1i ti\u1ebfp v\u1edbi t\u1ea3i, ngu\u1ed3n \u0111i\u1ec7n ho\u1eb7c \u0111\u1ea7u v\u00e0o<\/td><td>C\u00e1c m\u1ea1ch d\u1eebng\/ch\u1ea1y \u0111\u01a1n gi\u1ea3n nh\u1ea5t; c\u01a1 ch\u1ebf d\u1eebng khi \u0111\u1ea1t gi\u1edbi h\u1ea1n h\u00e0nh tr\u00ecnh<\/td><\/tr>\n<tr><td>3 ch\u00e2n \/ 3 c\u1ef1c<\/td><td>SPDT \u0111\u1ea7y \u0111\u1ee7: COM + NO + NC \u0111\u1ec1u \u0111\u01b0\u1ee3c d\u1eabn ra ngo\u00e0i<\/td><td>Ch\u1ecdn NO ho\u1eb7c NC cho t\u1eebng ch\u1ee9c n\u0103ng; c\u1ea3 hai t\u00f9y ch\u1ecdn \u0111\u1ec1u c\u00f3 s\u1eb5n<\/td><td>M\u1ed9t c\u00f4ng t\u1eafc v\u1eeba \u0111\u1ea3m nh\u1eadn ch\u1ee9c n\u0103ng d\u1eebng v\u1eeba \u0111\u1ea3m nh\u1eadn ch\u1ee9c n\u0103ng t\u00edn hi\u1ec7u<\/td><\/tr>\n<tr><td>4 c\u1ef1c<\/td><td>Hai m\u1ea1ch ti\u1ebfp \u0111i\u1ec3m \u0111\u1ed9c l\u1eadp trong c\u00f9ng m\u1ed9t th\u00e2n (v\u00ed d\u1ee5: hai m\u1ea1ch chuy\u1ec3n \u0111\u1ed5i, ho\u1eb7c NO + NC v\u1edbi c\u00e1c c\u1ef1c chung ri\u00eang bi\u1ec7t)<\/td><td>Hai t\u1ea3i ho\u1eb7c hai \u0111\u1ea7u v\u00e0o \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi m\u1ed9t b\u1ed9 truy\u1ec1n \u0111\u1ed9ng<\/td><td>Ph\u1ea3n h\u1ed3i v\u1ecb tr\u00ed c\u1eeda\/van tr\u00ean hai m\u1ea1ch ri\u00eang bi\u1ec7t<\/td><\/tr>\n<tr><td>\u201c4 d\u00e2y\u201d (d\u00e2y c\u00e1p \u0111i\u1ec1u khi\u1ec3n)<\/td><td>M\u1ed9t d\u00e2y c\u00e1p c\u00f3 \u0111\u1ea7u n\u1ed1i t\u1eeb b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, ch\u1ee9 kh\u00f4ng ph\u1ea3i t\u1eeb c\u00e1c c\u1ef1c c\u1ee7a c\u00f4ng t\u1eafc<\/td><td>H\u00e3y l\u00e0m theo h\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, kh\u00f4ng ph\u1ea3i theo m\u00e0u c\u1ee7a c\u00f4ng t\u1eafc<\/td><td>D\u00e2y n\u1ecbt \u0111i\u1ec7n cho robot\/ph\u01b0\u01a1ng ti\u1ec7n. Kh\u00f4ng n\u00ean nh\u1ea7m l\u1eabn v\u1edbi c\u00e1c \u0111\u1ea7u n\u1ed1i c\u00f4ng t\u1eafc<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>C\u1ea7n gi\u1ea3i th\u00edch r\u00f5 v\u1ec1 \u201cc\u01a1 ch\u1ebf 4 d\u00e2y\u201d. Trong l\u0129nh v\u1ef1c robot v\u00e0 th\u1ee7y l\u1ef1c (v\u00ed d\u1ee5 nh\u01b0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n trung t\u00e2m c\u1ee7a robot FTC, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n r\u01a1-mo\u00f3c t\u1ef1 \u0111\u1ed5), ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00f9ng thu\u1eadt ng\u1eef \u201cc\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n 4 d\u00e2y\u201d khi mu\u1ed1n ch\u1ec9 <strong>d\u00e2y c\u00e1p b\u1ed9 \u0111i\u1ec1u khi\u1ec3n<\/strong>: b\u1ed1n d\u00e2y d\u1eabn, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u b\u1eb1ng m\u00e3 m\u00e0u, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u00e0u \u0111en cho d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 m\u00e0u n\u00e2u cho cu\u1ed9n d\u00e2y l\u00ean. \u0110\u00f3 l\u00e0 m\u1ed9t s\u1ee3i c\u00e1p, kh\u00f4ng ph\u1ea3i s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ea7u n\u1ed1i. Tr\u00ean th\u00e2n c\u00f4ng t\u1eafc, y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh lu\u00f4n l\u00e0 kh\u1ed1i \u0111\u1ea7u n\u1ed1i. H\u00e3y d\u00e1n nh\u00e3n cho c\u00e1c \u0111\u1ea7u n\u1ed1i, \u0111\u1ebfm s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ea7u n\u1ed1i v\u00e0 \u0111\u1eebng bao gi\u1edd tin v\u00e0o m\u00e0u s\u1eafc c\u1ee7a d\u00e2y d\u1eabn.<\/p>\n<p>M\u00e0u d\u00e2y th\u1ef1c s\u1ef1 kh\u00f4ng \u0111\u00e1ng tin c\u1eady trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y. C\u00e1c h\u01b0\u1edbng d\u1eabn d\u00e0nh cho ng\u01b0\u1eddi ti\u00eau d\u00f9ng th\u01b0\u1eddng n\u00eau \u201cm\u00e0u \u0111\u1ecf l\u00e0 c\u1ef1c d\u01b0\u01a1ng (+), m\u00e0u \u0111en l\u00e0 c\u1ef1c \u00e2m (-)\u201d, v\u00e0 ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng b\u1ed1i r\u1ed1i kh\u00f4ng bi\u1ebft n\u00ean n\u1ed1i m\u00e0u n\u00e0o v\u00e0o \u0111\u00e2u. C\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a m\u1ed9t c\u1ed1 v\u1ea5n robotics gi\u00e0u kinh nghi\u1ec7m tr\u00ean m\u1ed9t ch\u1ee7 \u0111\u1ec1 di\u1ec5n \u0111\u00e0n FIRST ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u201cm\u00e0u d\u00e2y kh\u00f4ng quan tr\u1ecdng\u2026 th\u00f4ng th\u01b0\u1eddng COM v\u00e0 NO \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi \u0111\u1ea5t v\u00e0 t\u00edn hi\u1ec7u.\u201d C\u00e1c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u00f4ng nghi\u1ec7p kh\u00f4ng c\u00f3 ti\u00eau chu\u1ea9n m\u00e0u d\u00e2y chung, do \u0111\u00f3 hai c\u00f4ng t\u1eafc tr\u00f4ng gi\u1ed1ng h\u1ec7t nhau c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t v\u1edbi c\u00e1c quy \u01b0\u1edbc b\u00ean trong kh\u00e1c nhau. C\u00e1ch nh\u1eadn bi\u1ebft duy nh\u1ea5t \u0111\u00e1ng tin c\u1eady l\u00e0 k\u00fd hi\u1ec7u tr\u00ean \u0111\u1ea7u n\u1ed1i (COM\/NO\/NC, ho\u1eb7c \u0111\u01b0\u1ee3c \u0111\u00e1nh s\u1ed1 1\u20132\u20133\u20134) k\u1ebft h\u1ee3p v\u1edbi vi\u1ec7c ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c.<\/p>\n<p>C\u00f4ng t\u1eafc vi m\u00f4 c\u0169ng c\u00f3 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0ng trong m\u1ed9t th\u00e2n c\u00f4ng t\u1eafc nh\u1ecf h\u01a1n: \u0111\u00e2y l\u00e0 lo\u1ea1i c\u00f4ng t\u1eafc h\u00e0nh \u0111\u1ed9ng b\u1eadt\/t\u1eaft thu nh\u1ecf v\u1edbi kh\u1ed1i ti\u1ebfp \u0111i\u1ec3m COM\/NO\/NC gi\u1ed1ng h\u1ec7t, th\u01b0\u1eddng c\u00f3 \u0111\u1ecbnh m\u1ee9c trong d\u1ea3i 10\u201315 A \u1edf 250 VAC (<a href=\"https:\/\/tameson.com\/pages\/limit-switch\">Tameson<\/a>). N\u1ebfu b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ea5u d\u00e2y cho m\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n k\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n th\u00ec b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 \u0111\u1ea5u d\u00e2y cho m\u1ed9t c\u00f4ng t\u1eafc vi m\u00f4. C\u00e1ch \u0111\u1ea5u d\u00e2y c\u00e1c c\u1ef1c l\u00e0 ho\u00e0n to\u00e0n gi\u1ed1ng nhau.<\/p>\n\n\n<div style=\"margin:32px 0; padding:20px; background:#EAF3FB; border:1px solid #D3D3D3; border-radius:12px;\">\n <p style=\"margin:0 0 12px; font-family:'Roboto',sans-serif; font-size:18px; font-weight:700; line-height:1.35; color:#0D3972;\">\n Xem: C\u00e1ch k\u1ebft n\u1ed1i c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 \u0111\u1ea5u d\u00e2y NO\/NC\n <\/p>\n\n <div style=\"position:relative; width:100%; aspect-ratio:16 \/ 9; overflow:hidden; border-radius:8px; background:#000;\">\n <iframe\n src=\"https:\/\/www.youtube.com\/embed\/BM7i5BNdZp4?rel=0\"\n title=\"K\u1ebft n\u1ed1i c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 c\u00e1ch \u0111\u1ea5u d\u00e2y NO\/NC\"\n loading=\"lazy\"\n style=\"position:absolute; inset:0; width:100%; height:100%; border:0;\"\n allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\"\n referrerpolicy=\"strict-origin-when-cross-origin\"\n allowfullscreen>\n <\/iframe>\n <\/div>\n<\/div>\n\n<h2>NO hay NC? L\u1ef1a ch\u1ecdn lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m b\u1ecb ng\u1eaft \u0111\u00fang c\u00e1ch<\/h2>\n<p>C\u00e2u h\u1ecfi m\u00e0 m\u1ecdi ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng \u0111\u1eb7t ra: \u201cT\u00f4i n\u00ean d\u00f9ng NO hay NC?\u201d, th\u01b0\u1eddng \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi b\u1eb1ng m\u1ed9t c\u00e2u kh\u1ea9u hi\u1ec7u: <em>S\u1eed d\u1ee5ng NC \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n<\/em>. C\u00e2u kh\u1ea9u hi\u1ec7u \u0111\u00f3 ch\u1ec9 \u0111\u00fang m\u1ed9t n\u1eeda v\u00e0 g\u00e2y ra nh\u1eefng t\u00e1c h\u1ea1i th\u1ef1c s\u1ef1 khi \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng m\u1ed9t c\u00e1ch m\u00f9 qu\u00e1ng, b\u1edfi v\u00ec n\u00f3 b\u1ecf qua b\u1ea3n ch\u1ea5t c\u1ee7a m\u1ed1i li\u00ean h\u1ec7 \u0111\u00f3 <em>\u0111\u1ec3<\/em> trong m\u1ea1ch c\u1ee7a b\u1ea1n.<\/p>\n<h3>H\u00e0m n\u00e0y x\u00e1c \u0111\u1ecbnh lo\u1ea1i t\u00e1c v\u1ee5: t\u00e1c v\u1ee5 d\u1eebng (stop-jobs) hay t\u00e1c v\u1ee5 s\u1ef1 ki\u1ec7n (event-jobs)<\/h3>\n<p>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n th\u1ef1c hi\u1ec7n m\u1ed9t trong hai ch\u1ee9c n\u0103ng, v\u00e0 ch\u1ee9c n\u0103ng \u0111\u00f3 quy\u1ebft \u0111\u1ecbnh lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m:<\/p>\n<ul>\n<li><strong>C\u00f4ng vi\u1ec7c t\u1ea1m ng\u01b0ng<\/strong>: ch\u1ed1t gi\u1edbi h\u1ea1n h\u00e0nh tr\u00ecnh, c\u01a1 ch\u1ebf kh\u00f3a an to\u00e0n, thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ch\u1ed1ng v\u01b0\u1ee3t h\u00e0nh tr\u00ecnh. M\u1ea1ch ho\u1ea1t \u0111\u1ed9ng \u1edf tr\u1ea1ng th\u00e1i b\u00ecnh th\u01b0\u1eddng v\u00e0 ph\u1ea3i <em>th\u1ea3<\/em> khi \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n. N\u1ed1i d\u00e2y <strong>NC<\/strong> ti\u1ebfp \u0111i\u1ec3m n\u1ed1i ti\u1ebfp. D\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua (ho\u1eb7c t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o \u1edf m\u1ee9c logic 1) khi m\u00e1y \u0111ang di chuy\u1ec3n; vi\u1ec7c m\u1edf ti\u1ebfp \u0111i\u1ec3m NC khi \u0111\u1ea1t gi\u1edbi h\u1ea1n s\u1ebd ng\u1eaft m\u1ea1ch.<\/li>\n<li><strong>C\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn s\u1ef1 ki\u1ec7n<\/strong>: \u0111\u1ebfn v\u1ecb tr\u00ed, ph\u00e1t hi\u1ec7n v\u1ecb tr\u00ed ban \u0111\u1ea7u, \u0111\u1ebfm, x\u00e1c nh\u1eadn \u201c\u0111\u00e3 \u0111\u1ebfn\u201d. Kh\u00f4ng c\u00f3 ho\u1ea1t \u0111\u1ed9ng n\u00e0o di\u1ec5n ra cho \u0111\u1ebfn khi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng \u0111\u01b0\u1ee3c nh\u1ea5n. N\u1ed1i d\u00e2y <strong>KH\u00d4NG<\/strong> li\u00ean h\u1ec7. M\u1ea1ch ch\u1ec9 \u0111\u00f3ng (ho\u1eb7c gi\u00e1 tr\u1ecb \u0111\u1ea7u v\u00e0o chuy\u1ec3n sang 1) khi th\u1ef1c s\u1ef1 \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n.<\/li>\n<\/ul>\n<p>N\u1ebfu b\u1ea1n \u00e9p ch\u1ebf \u0111\u1ed9 NC v\u00e0o m\u1ed9t t\u00e1c v\u1ee5 s\u1ef1 ki\u1ec7n, m\u00e1y c\u1ee7a b\u1ea1n s\u1ebd k\u00edch ho\u1ea1t to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng <em>tr\u1eeb khi<\/em> khi c\u1ea7n thi\u1ebft. N\u1ebfu b\u1ea1n \u00e9p gi\u00e1 tr\u1ecb NO v\u00e0o l\u1ec7nh d\u1eebng c\u00f4ng vi\u1ec7c, b\u1ea1n s\u1ebd g\u1eb7p ph\u1ea3i t\u00ecnh tr\u1ea1ng l\u1ed7i nh\u01b0 d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h3>T\u1ea1i sao c\u00e1c c\u00f4ng vi\u1ec7c t\u1ea1m d\u1eebng n\u00ean \u0111\u01b0\u1ee3c coi l\u00e0 NC: ma tr\u1eadn d\u00e2y \u0111\u1ee9t<\/h3>\n<p>L\u00fd do kh\u00f4ng ph\u1ea3i l\u00e0 do quy \u01b0\u1edbc. \u0110\u00f3 l\u00e0 nh\u1eefng g\u00ec x\u1ea3y ra khi d\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng, \u0111\u00e2y l\u00e0 s\u1ef1 c\u1ed1 th\u01b0\u1eddng g\u1eb7p nh\u1ea5t trong th\u1ef1c t\u1ebf \u0111\u1ed1i v\u1edbi m\u1ea1ch n\u00e0y (<a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">cu\u1ed9c th\u1ea3o lu\u1eadn tr\u00ean PLCTalk<\/a>).<\/p>\n\n<div class=\"rich-callout-warning\">\n<span class=\"rich-callout-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86 1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"\/><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"\/><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"\/><\/svg><\/span>\n<p><strong>M\u1ed9t s\u1ee3i d\u00e2y b\u1ecb \u0111\u1ee9t n\u1eb1m trong m\u1ea1ch NO.<\/strong> V\u1edbi h\u1ec7 th\u1ed1ng kh\u00f4ng c\u00f3 d\u00e2y cho ch\u1ee9c n\u0103ng d\u1eebng, vi\u1ec7c \u0111\u1ee9t d\u00e2y s\u1ebd \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n ch\u00ednh x\u00e1c nh\u01b0 \u201cch\u01b0a \u0111\u1ea1t gi\u1edbi h\u1ea1n\u201d. M\u00e1y s\u1ebd ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u00f3 c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7. Trong h\u1ec7 th\u1ed1ng d\u00e2y NC, vi\u1ec7c \u0111\u1ee9t d\u00e2y kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c v\u1edbi t\u00ecnh tr\u1ea1ng c\u1ea3m bi\u1ebfn gi\u1edbi h\u1ea1n b\u1ecb k\u00edch ho\u1ea1t. D\u00f9 trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o, m\u1ea1ch \u0111i\u1ec7n c\u0169ng b\u1ecb ng\u1eaft v\u00e0 m\u00e1y s\u1ebd d\u1eebng l\u1ea1i.<\/p>\n<\/div>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>T\u00ecnh tr\u1ea1ng m\u1ea1ch \u0111i\u1ec7n<\/th><th>Wired NC (d\u1eebng c\u00f4ng vi\u1ec7c)<\/th><th>Wired NO (d\u1eebng c\u00f4ng vi\u1ec7c)<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>B\u00ecnh th\u01b0\u1eddng, ch\u01b0a \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n<\/td><td>\u0110i\u1ec1u khi\u1ec3n \/ \u0111\u1ea7u v\u00e0o = 1<\/td><td>M\u1edf \/ \u0111\u1ea7u v\u00e0o = 0<\/td><\/tr>\n<tr><td>\u0110\u00e3 \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n<\/td><td>M\u1edf, m\u00e1y d\u1eebng<\/td><td>\u0110\u00e3 \u0111\u00f3ng, m\u00e1y d\u1eebng ho\u1ea1t \u0111\u1ed9ng<\/td><\/tr>\n<tr><td><strong>D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng<\/strong><\/td><td><strong>M\u1edf, m\u00e1y d\u1eebng (an to\u00e0n)<\/strong><\/td><td><strong>M\u1edf, m\u00e1y v\u1eabn ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng (kh\u00f4ng b\u1ecb ph\u00e1t hi\u1ec7n)<\/strong><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>M\u1ed9t d\u00e2y b\u1ecb \u0111\u1ee9t kh\u00f4ng th\u1ec3 \u0111\u00e1nh l\u1eeba m\u1ea1ch NC. M\u1ea1ch s\u1ebd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. Ng\u01b0\u1ee3c l\u1ea1i, n\u00f3 l\u1ea1i \u0111\u00e1nh l\u1eeba ho\u00e0n to\u00e0n m\u1ea1ch NO: h\u1ec7 th\u1ed1ng cho r\u1eb1ng gi\u1edbi h\u1ea1n \u0111\u01a1n gi\u1ea3n l\u00e0 ch\u01b0a \u0111\u01b0\u1ee3c \u0111\u1ea1t \u0111\u1ebfn. S\u1ef1 b\u1ea5t \u0111\u1ed1i x\u1ee9ng n\u00e0y ch\u00ednh l\u00e0 l\u00fd do duy nh\u1ea5t \u1ee7ng h\u1ed9 vi\u1ec7c s\u1eed d\u1ee5ng m\u1ea1ch NC \u0111\u1ed1i v\u1edbi c\u00e1c gi\u1edbi h\u1ea1n li\u00ean quan \u0111\u1ebfn an to\u00e0n, v\u00e0 \u0111\u00e2y l\u00e0 d\u00f2ng duy nh\u1ea5t trong b\u1ea3ng n\u00e0y \u0111\u00e1ng \u0111\u1ec3 ghi nh\u1edb. <strong>M\u1ed9t d\u00e2y b\u1ecb \u0111\u1ee9t s\u1ebd chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 an to\u00e0n (fails safe) qua ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng \u0111\u00f3ng (NC) v\u00e0 chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 im l\u1eb7ng (fails silent) qua ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf (NO).<\/strong><\/p>\n\n\n<div class=\"bp-1-break\">\n<p class=\"bp-1-title\"><span class=\"bp-1-title-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M20 13c0 5-3.5 7.5-7.66 8.95a1 1 0 0 1-.67-.01C7.5 20.5 4 18 4 13V6a1 1 0 0 1 1-1c2 0 4.5-1.2 6.24-2.72a1.17 1.17 0 0 1 1.52 0C14.51 3.81 17 5 19 5a1 1 0 0 1 1 1z\"\/><path d=\"m9 12 2 2 4-4\"\/><\/svg><\/span>D\u00f2ng quy\u1ebft \u0111\u1ecbnh th\u00f4ng tin li\u00ean h\u1ec7 c\u1ee7a b\u1ea1n<\/p>\n<p class=\"bp-1-lede\">D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i l\u1ecfng \u2014 h\u00e0ng th\u1ee9 ba c\u1ee7a ma tr\u1eadn, h\u00ecnh ph\u00f3ng to.<\/p>\n<div class=\"bp-1-cols\">\n<div class=\"bp-1-col\">\n<p class=\"bp-1-col-head\"><span class=\"bp-1-col-ic bp-1-ic-ok\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><path d=\"m16 9-5.5 5.5L8 12\"\/><\/svg><\/span>Wired NC \u2014 t\u1ea1m d\u1eebng c\u00f4ng vi\u1ec7c<\/p>\n<p class=\"bp-1-ctx\">D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng<\/p>\n<p class=\"bp-1-mech\">C\u00f4ng t\u1eafc m\u1edf \u2014 \u0111i\u1ec7n \u00e1p \u0111\u1ea7u v\u00e0o gi\u1ea3m xu\u1ed1ng 0 V<\/p>\n<p class=\"bp-1-verdict bp-1-verdict-ok\">D\u1eebng an to\u00e0n<\/p>\n<\/div>\n<div class=\"bp-1-col bp-1-col-no\">\n<p class=\"bp-1-col-head\"><span class=\"bp-1-col-ic bp-1-ic-no\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><path d=\"m15 9-6 6\"\/><path d=\"m9 9 6 6\"\/><\/svg><\/span>Wired NO \u2014 ng\u1eebng c\u00f4ng vi\u1ec7c<\/p>\n<p class=\"bp-1-ctx\">D\u00e2y b\u1ecb \u0111\u1ee9t ho\u1eb7c \u0111\u1ea7u n\u1ed1i b\u1ecb l\u1ecfng<\/p>\n<p class=\"bp-1-mech\">K\u00eanh li\u00ean l\u1ea1c v\u1eabn m\u1edf \u2014 th\u00f4ng b\u00e1o hi\u1ec3n th\u1ecb l\u00e0 \u201cch\u01b0a \u0111\u1ea1t gi\u1edbi h\u1ea1n\u201d<\/p>\n<p class=\"bp-1-verdict bp-1-verdict-no\">M\u00e1y v\u1eabn ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n<p>Tuy nhi\u00ean, NC kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u201ct\u1ed1t h\u01a1n\u201d. C\u00e1c m\u1ea1ch NC v\u1eabn d\u1eabn \u0111i\u1ec7n trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. Cu\u1ed9n d\u00e2y ti\u1ebfp \u0111i\u1ec3m \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n li\u00ean t\u1ee5c 24\/7 s\u1ebd g\u00e2y ra nhi\u1ec7t v\u00e0 m\u00e0i m\u00f2n, trong khi c\u00e1c t\u00e1c v\u1ee5 theo s\u1ef1 ki\u1ec7n th\u1ef1c s\u1ef1 c\u1ea7n NO. Nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n l\u00e0: l\u1ef1a ch\u1ecdn ti\u1ebfp \u0111i\u1ec3m ph\u00f9 h\u1ee3p v\u1edbi ch\u1ee9c n\u0103ng; v\u00e0 khi ch\u1ee9c n\u0103ng \u0111\u00f3 l\u00e0 \u201cd\u1eebng\u201d, h\u00e3y ch\u1ecdn ti\u1ebfp \u0111i\u1ec3m c\u00f3 <em>th\u1ea5t b\u1ea1i<\/em> c\u0169ng l\u00e0 m\u1ed9t tr\u1ea1m d\u1eebng.<\/p>\n<h3>Hai c\u00f4ng t\u1eafc tr\u00ean m\u1ed9t \u0111\u1ed9ng c\u01a1 \u0111\u1ea3o chi\u1ec1u<\/h3>\n<p>T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm li\u00ean quan \u201cc\u00e1ch n\u1ed1i d\u00e2y 2 c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n\u201d m\u00f4 t\u1ea3 m\u1ea1ch tr\u1ee5c hai chi\u1ec1u c\u1ed5 \u0111i\u1ec3n: m\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n \u1edf m\u1ed7i \u0111\u1ea7u h\u00e0nh tr\u00ecnh, m\u1ed7i c\u00f4ng t\u1eafc d\u1eebng chuy\u1ec3n \u0111\u1ed9ng theo h\u01b0\u1edbng ri\u00eang c\u1ee7a m\u00ecnh. C\u00f3 hai sai l\u1ea7m ch\u1ee7 y\u1ebfu \u1edf \u0111\u00e2y.<\/p>\n<p>Tr\u01b0\u1edbc h\u1ebft, m\u1ed7i \u0111\u1ea7u ch\u1ec9 \u0111\u01b0\u1ee3c d\u1eebng l\u1ea1i theo h\u01b0\u1edbng c\u1ee7a ch\u00ednh n\u00f3. M\u1ed9t thi\u1ebft k\u1ebf ph\u1ed5 bi\u1ebfn d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng d\u1eebng l\u1ea1i <em>t\u1ea5t c\u1ea3<\/em> chuy\u1ec3n \u0111\u1ed9ng khi m\u1ed9t trong hai c\u00f4ng t\u1eafc b\u1ecb k\u00edch ho\u1ea1t. L\u00fac \u0111\u00f3, tr\u1ee5c s\u1ebd d\u1eebng l\u1ea1i t\u1ea1i gi\u1edbi h\u1ea1n CCW v\u00e0 kh\u00f4ng bao gi\u1edd c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n theo chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 di chuy\u1ec3n ra kh\u1ecfi v\u1ecb tr\u00ed \u0111\u00f3. M\u1ed9t ng\u01b0\u1eddi d\u00f9ng PLCTalk \u0111ang l\u1eafp r\u00e1p tr\u1ee5c \u0111\u1ed9ng c\u01a1 b\u01b0\u1edbc \u0111\u00e3 g\u1eb7p ph\u1ea3i ch\u00ednh t\u00ecnh hu\u1ed1ng n\u00e0y v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c kh\u1eafc ph\u1ee5c ngay trong ch\u1ee7 \u0111\u1ec1 th\u1ea3o lu\u1eadn: c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n CW ng\u0103n chuy\u1ec3n \u0111\u1ed9ng theo chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3, c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n CCW ng\u0103n chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3, v\u00e0 logic ph\u1ea3i duy tr\u00ec h\u01b0\u1edbng tho\u00e1t (<a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">PLCTalk, C\u00e1ch \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n S7-1200<\/a>). Trong m\u1ed9t ch\u1ee7 \u0111\u1ec1 tr\u00ean r\/PLC v\u1ec1 m\u1ed9t c\u1eb7p b\u1ed9 truy\u1ec1n \u0111\u1ed9ng tuy\u1ebfn t\u00ednh ho\u1ea1t \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u nhau, c\u00e2u tr\u1ea3 l\u1eddi nh\u1eadn \u0111\u01b0\u1ee3c c\u0169ng gi\u1ed1ng nh\u01b0 v\u1eady: \u201cb\u1ea1n s\u1ebd c\u1ea7n hai m\u1ea1ch logic ri\u00eang bi\u1ec7t cho ch\u1ebf \u0111\u1ed9 m\u1edf r\u1ed9ng v\u00e0 thu h\u1ed3i\u2026 n\u00fat thu h\u1ed3i v\u1eabn s\u1ebd ho\u1ea1t \u0111\u1ed9ng\u201d (<a href=\"https:\/\/www.reddit.com\/r\/PLC\/comments\/1bhn3y0\/limit_switch_logic\/\">r\/PLC, M\u1ea1ch logic c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n<\/a>).<\/p>\n<p>Th\u1ee9 hai, h\u00e3y ch\u1ecdn c\u01a1 ch\u1ebf ti\u1ebfp \u0111i\u1ec3m theo t\u1eebng h\u01b0\u1edbng. NC \u0111\u01b0\u1ee3c n\u1ed1i ti\u1ebfp v\u1edbi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng c\u1ee7a t\u1eebng h\u01b0\u1edbng, do \u0111\u00f3 n\u1ebfu d\u00e2y b\u1ecb \u0111\u1ee9t, h\u01b0\u1edbng \u0111\u00f3 s\u1ebd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng, trong khi h\u01b0\u1edbng ng\u01b0\u1ee3c l\u1ea1i v\u1eabn ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng nh\u1edd m\u1ea1ch ri\u00eang c\u1ee7a n\u00f3. \u0110\u1ed1i v\u1edbi b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ea3o chi\u1ec1u d\u1ef1a tr\u00ean c\u00f4ng t\u1eafc t\u01a1, m\u1ed7i gi\u1edbi h\u1ea1n h\u00e0nh tr\u00ecnh \u0111\u01b0\u1ee3c n\u1ed1i ti\u1ebfp v\u1edbi cu\u1ed9n d\u00e2y c\u1ee7a h\u01b0\u1edbng t\u01b0\u01a1ng \u1ee9ng, v\u00e0 hai c\u01a1 ch\u1ebf kh\u00f3a li\u00ean \u0111\u1ed9ng c\u1ee7a c\u00f4ng t\u1eafc t\u01a1 s\u1ebd x\u1eed l\u00fd ph\u1ea7n c\u00f2n l\u1ea1i.<\/p>\n<p>M\u1ed9t l\u01b0u \u00fd n\u1eefa t\u1eeb th\u1ef1c t\u1ebf. N\u1ebfu c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n d\u1eebng \u0111\u1ed9ng c\u01a1 b\u1eb1ng c\u00e1ch ng\u1eaft m\u1ea1ch <strong>m\u1ea1ch cu\u1ed9n d\u00e2y c\u1ee7a c\u00f4ng t\u1eafc t\u01a1<\/strong>, c\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a c\u00f4ng t\u1eafc ch\u1ec9 d\u1eabn d\u00f2ng \u0111i\u1ec7n cho cu\u1ed9n d\u00e2y m\u00e0 th\u00f4i. \u0110\u00f3 l\u00e0 c\u00e1ch b\u1ed1 tr\u00ed \u0111\u00fang \u0111\u1eafn v\u00e0 \u0111\u1ea3m b\u1ea3o tu\u1ed5i th\u1ecd cao. Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu b\u1ea1n d\u1eabn d\u00f2ng \u0111i\u1ec7n c\u1ee7a \u0111\u1ed9ng c\u01a1 qua ch\u00ednh c\u00f4ng t\u1eafc, b\u1ea1n s\u1ebd chuy\u1ec3n t\u1eeb mi\u1ec1n t\u00edn hi\u1ec7u sang mi\u1ec1n c\u00f4ng su\u1ea5t, v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a ti\u1ebfp \u0111i\u1ec3m \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong ph\u1ea7n cu\u1ed1i c\u1ee7a b\u00e0i vi\u1ebft n\u00e0y s\u1ebd tr\u1edf th\u00e0nh y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh.<\/p>\n\n\n<div class=\"bp-cta-mid\">\n<div class=\"bp-cta-mid-copy\">\n<p class=\"bp-cta-mid-lead\">Tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng linh ki\u1ec7n thay th\u1ebf, h\u00e3y x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc ph\u00eda t\u1ea3i: d\u00f2ng \u0111i\u1ec7n c\u1ee7a \u0111\u1ed9ng c\u01a1 ho\u1eb7c cu\u1ed9n d\u00e2y, ho\u1eb7c t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o c\u1ee7a b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u2014 v\u00e0 xem li\u1ec7u n\u00f3 ph\u1ea3i d\u1eebng l\u1ea1i hay ph\u00e1t t\u00edn hi\u1ec7u.<\/p>\n<p class=\"bp-cta-mid-note\">C\u00e1c h\u00e0ng \u201cDC\u201d v\u00e0 \u201c\u0111i\u1ec7n c\u1ea3m\u201d tr\u00ean b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh lo\u1ea1i linh ki\u1ec7n.<\/p>\n<\/div>\n<a class=\"bp-cta-mid-btn\" href=\"https:\/\/www.omch.com\/vi\/contact\/\" target=\"_self\">Ki\u1ec3m tra th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt m\u1ea1ch ng\u1eaft<\/a>\n<\/div>\n\n<h2>K\u1ebft n\u1ed1i c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a PLC ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n<\/h2>\n<p>M\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u1ea5p t\u00edn hi\u1ec7u cho \u0111\u1ea7u v\u00e0o r\u1eddi r\u1ea1c c\u1ee7a PLC c\u0169ng c\u00f3 c\u1ea5u tr\u00fac ba c\u1ef1c t\u01b0\u01a1ng t\u1ef1, c\u1ed9ng th\u00eam m\u1ed9t k\u1ebft n\u1ed1i b\u1ed5 sung m\u00e0 ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng hay b\u1ecf qua: \u0111\u01b0\u1eddng d\u1eabn tr\u1edf v\u1ec1 c\u1ee7a \u0111\u1ea7u v\u00e0o.<\/p>\n<p>C\u00f4ng t\u1eafc l\u00e0 m\u1ed9t <strong>ti\u1ebfp x\u00fac kh\u00f4<\/strong>. Thi\u1ebft b\u1ecb n\u00e0y kh\u00f4ng cung c\u1ea5p hay ti\u00eau th\u1ee5 d\u00f2ng \u0111i\u1ec7n, m\u00e0 ch\u1ec9 c\u00f3 ch\u1ee9c n\u0103ng \u0111\u00f3ng v\u00e0 ng\u1eaft m\u1ea1ch. M\u1ea1ch \u0111\u01b0\u1ee3c ho\u00e0n th\u00e0nh nh\u1edd ngu\u1ed3n \u0111i\u1ec7n ri\u00eang c\u1ee7a th\u1ebb \u0111\u1ea7u v\u00e0o, v\u00e0 v\u1ea5n \u0111\u1ec1 duy nh\u1ea5t li\u00ean quan \u0111\u1ebfn vi\u1ec7c n\u1ed1i d\u00e2y l\u00e0 th\u1ebb c\u1ee7a b\u1ea1n y\u00eau c\u1ea7u b\u1ed1 tr\u00ed c\u1ef1c t\u00ednh nh\u01b0 th\u1ebf n\u00e0o.<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Ch\u1ecdn lo\u1ea1i th\u1ebb<\/th><th>D\u00f2ng \u0111i\u1ec7n +24 VDC \u0111i \u0111\u1ebfn \u0111\u00e2u<\/th><th>\u0110\u1ea7u ra c\u1ee7a c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi \u0111\u00e2u<\/th><th>V\u1ecb tr\u00ed \u0111\u1eb7t th\u1ebb th\u00f4ng th\u01b0\u1eddng<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>\u0110\u1ea7u v\u00e0o \u00e2m (d\u00f2ng \u0111i\u1ec7n ch\u1ea1y v\u00e0o \u0111\u1ea7u v\u00e0o; th\u01b0\u1eddng th\u1ea5y trong c\u00e1c b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ki\u1ec3u AB \u1edf B\u1eafc M\u1ef9)<\/td><td>\u0110\u1ebfn c\u1ed5ng COM<\/td><td>C\u1ed5ng NO ho\u1eb7c NC, sau \u0111\u00f3 n\u1ed1i v\u1edbi k\u00eanh \u0111\u1ea7u v\u00e0o<\/td><td>Th\u1ebb \u1edf ch\u1ebf \u0111\u1ed9 th\u00f4ng th\u01b0\u1eddng, sau \u0111\u00f3 chuy\u1ec3n sang 0 VDC (\u0111\u01b0\u1eddng \u0111i\u1ec7n \u00e2m)<\/td><\/tr>\n<tr><td>Ngu\u1ed3n c\u1ea5p \u0111\u1ea7u v\u00e0o (d\u00f2ng \u0111i\u1ec7n ch\u1ea1y ra kh\u1ecfi \u0111\u1ea7u v\u00e0o; th\u01b0\u1eddng th\u1ea5y trong c\u00e1c b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ki\u1ec3u Siemens)<\/td><td>\u0110\u1ebfn ph\u1ea7n th\u1ebb th\u00f4ng th\u01b0\u1eddng<\/td><td>C\u1ed5ng NO ho\u1eb7c NC, sau \u0111\u00f3 n\u1ed1i v\u1edbi k\u00eanh \u0111\u1ea7u v\u00e0o<\/td><td>Chuy\u1ec3n sang c\u1ed5ng COM, sau \u0111\u00f3 chuy\u1ec3n sang 0 VDC<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>D\u00f9 th\u1ebb c\u1ee7a b\u1ea1n s\u1eed d\u1ee5ng c\u00e1ch b\u1ed1 tr\u00ed n\u00e0o \u0111i ch\u0103ng n\u1eefa, m\u1ea1ch v\u00f2ng ph\u1ea3i \u0111\u01b0\u1ee3c kh\u00e9p k\u00edn: ngu\u1ed3n \u0111i\u1ec7n \u0111i ra kh\u1ecfi b\u1ed9 c\u1ea5p ngu\u1ed3n, \u0111i qua ti\u1ebfp \u0111i\u1ec3m c\u00f4ng t\u1eafc, \u0111i v\u00e0o \u0111\u1ea7u v\u00e0o, v\u00e0 quay tr\u1edf l\u1ea1i b\u1ed9 c\u1ea5p ngu\u1ed3n qua c\u1ef1c chung c\u1ee7a th\u1ebb \u0111\u1ea7u v\u00e0o. N\u1ebfu thi\u1ebfu \u0111o\u1ea1n cu\u1ed1i c\u00f9ng n\u00e0y, s\u1ebd kh\u00f4ng c\u00f3 g\u00ec x\u1ea3y ra. \u0110\u00e2y ch\u00ednh x\u00e1c l\u00e0 l\u1ed7i \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong ch\u1ee7 \u0111\u1ec1 PLCTalk \u1edf tr\u00ean. C\u00f4ng t\u1eafc \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n v\u00e0 n\u1ed1i d\u00e2y v\u1edbi \u0111\u1ea7u v\u00e0o \u0111\u00fang c\u00e1ch, nh\u01b0ng c\u1ef1c chung \u0111\u1ea7u v\u00e0o c\u1ee7a CPU kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi 0 V, do \u0111\u00f3 \u0111\u1ea7u v\u00e0o kh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i d\u00f9 c\u1ea7n g\u1ea1t \u0111\u01b0\u1ee3c nh\u1ea5n nh\u01b0 th\u1ebf n\u00e0o \u0111i ch\u0103ng n\u1eefa. C\u00e1ch kh\u1eafc ph\u1ee5c l\u00e0 n\u1ed1i m\u1ed9t d\u00e2y v\u00e0o c\u1ef1c chung \u0111\u1ea7u v\u00e0o.<\/p>\n<p>Sau khi ho\u00e0n t\u1ea5t vi\u1ec7c n\u1ed1i d\u00e2y v\u1eadt l\u00fd, ch\u01b0\u01a1ng tr\u00ecnh ph\u1ea3i \u0111\u1ecdc t\u00edn hi\u1ec7u t\u1eeb ti\u1ebfp \u0111i\u1ec3m theo \u0111\u00fang c\u00e1ch n\u00f3 \u0111\u01b0\u1ee3c n\u1ed1i d\u00e2y. N\u1ed1i d\u00e2y cho ti\u1ebfp \u0111i\u1ec3m NC (c\u00e1ch b\u1ed1 tr\u00ed d\u1eebng c\u00f4ng vi\u1ec7c \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb t\u1eeb ph\u1ea7n tr\u01b0\u1edbc), v\u00e0 t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o s\u1ebd \u1edf m\u1ee9c logic 1 trong qu\u00e1 tr\u00ecnh di chuy\u1ec3n b\u00ecnh th\u01b0\u1eddng. Khi gi\u1edbi h\u1ea1n b\u1ecb k\u00edch ho\u1ea1t ho\u1eb7c d\u00e2y b\u1ecb \u0111\u1ee9t, t\u00edn hi\u1ec7u s\u1ebd chuy\u1ec3n sang 0, khi\u1ebfn tr\u1ee5c d\u1eebng l\u1ea1i \u1edf b\u1ea5t k\u1ef3 h\u01b0\u1edbng n\u00e0o. L\u1eadp tr\u00ecnh bi\u1ebfn s\u1ed1 sao cho 1 = \u201cch\u01b0a \u0111\u1ea1t gi\u1edbi h\u1ea1n\u201d, v\u00e0 m\u1ecdi c\u01a1 ch\u1ebf kh\u00f3a li\u00ean \u0111\u1ed9ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng d\u1ef1a tr\u00ean bit \u0111\u00f3 s\u1ebd ho\u1ea1t \u0111\u1ed9ng theo nguy\u00ean t\u1eafc an to\u00e0n (failsafe).<\/p>\n<p>Hai chi ti\u1ebft th\u1ef1c t\u1ebf. Hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng ti\u1ebfp \u0111i\u1ec3m \u2014 hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00f3ng\/m\u1edf li\u00ean t\u1ee5c khi c\u00e1c ti\u1ebfp \u0111i\u1ec3m ch\u1ea1m v\u00e0o nhau l\u1ea7n \u0111\u1ea7u \u2014 th\u01b0\u1eddng k\u00e9o d\u00e0i t\u1eeb 1\u20135 ms, v\u00e0 h\u1ea7u h\u1ebft c\u00e1c bo m\u1ea1ch \u0111\u1ea7u v\u00e0o \u0111\u1ec1u c\u00f3 b\u1ed9 l\u1ecdc trong kho\u1ea3ng 4\u201312 ms. N\u1ebfu m\u00e1y c\u1ee7a b\u1ea1n ph\u00e1t hi\u1ec7n c\u00e1c xung \u1ea3o tr\u00ean tr\u1ee5c chuy\u1ec3n \u0111\u1ed9ng nhanh, h\u00e3y ki\u1ec3m tra th\u1eddi gian l\u1ecdc \u0111\u1ea7u v\u00e0o c\u1ee7a bo m\u1ea1ch tr\u01b0\u1edbc khi th\u00eam b\u1ed9 h\u1eb9n gi\u1edd ph\u1ea7n m\u1ec1m (<a href=\"https:\/\/plcprogramming.io\/blog\/limit-switch-explained\">PLCprogramming.io<\/a>). V\u00e0 nguy\u00ean l\u00fd ti\u1ebfp \u0111i\u1ec3m kh\u00f4 n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng nguy\u00ean v\u1eb9n cho vi \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n robot. \u0110i\u1ec3m kh\u00e1c bi\u1ec7t duy nh\u1ea5t n\u1eb1m \u1edf d\u1ea3i \u0111i\u1ec7n \u00e1p (5 V ho\u1eb7c 3,3 V thay v\u00ec 24 V), ch\u00ednh v\u00ec v\u1eady m\u00e0 c\u00e1c ch\u1ee7 \u0111\u1ec1 v\u1ec1 robot li\u00ean quan \u0111\u1ebfn RoboRIO v\u00e0 REV hub \u0111ang gi\u1ea3i quy\u1ebft c\u00f9ng m\u1ed9t v\u1ea5n \u0111\u1ec1 nh\u01b0 c\u00e1c ch\u1ee7 \u0111\u1ec1 v\u1ec1 PLC.<\/p>\n\n\n<div class=\"bp-2-loop\">\n<p class=\"bp-2-title\"><span class=\"bp-2-title-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M17 19a1 1 0 0 1-1-1v-2a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2a1 1 0 0 1-1 1z\"\/><path d=\"M17 21v-2\"\/><path d=\"M19 14V6.5a1 1 0 0 0-7 0v11a1 1 0 0 1-7 0V10\"\/><path d=\"M21 21v-2\"\/><path d=\"M3 5V3\"\/><path d=\"M4 10a2 2 0 0 1-2-2V6a1 1 0 0 1 1-1h4a1 1 0 0 1 1 1v2a2 2 0 0 1-2 2z\"\/><path d=\"M7 5V3\"\/><\/svg><\/span>M\u1ed9t v\u00f2ng, n\u0103m ch\u1eb7ng<\/p>\n<div class=\"bp-2-flow\">\n<span class=\"bp-2-chip bp-2-chip-key\">+24 V<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip\">ti\u1ebfp \u0111i\u1ec3m c\u00f4ng t\u1eafc<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip\">c\u1ed5ng \u0111\u1ea7u v\u00e0o<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip bp-2-chip-key\">th\u1ebb th\u00f4ng th\u01b0\u1eddng<\/span>\n<span class=\"bp-2-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span>\n<span class=\"bp-2-chip\">0 V<\/span>\n<\/div>\n<p class=\"bp-2-foot\">M\u1ed7i l\u01b0\u1ee3t \u0111i \u0111\u1ec1u ph\u1ea3i c\u00f3 n\u01b0\u1edbc \u0111i \u2014 l\u00e1 b\u00e0i th\u00f4ng th\u01b0\u1eddng ch\u00ednh l\u00e0 th\u1ee9 m\u00e0 m\u1ecdi ng\u01b0\u1eddi th\u01b0\u1eddng b\u1ecf qua.<\/p>\n<\/div>\n\n<h2>Ki\u1ec3m tra h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n: Ki\u1ec3m tra b\u1eb1ng \u0111\u1ed3ng h\u1ed3 \u0111o v\u00e0 tra c\u1ee9u c\u00e1c tri\u1ec7u ch\u1ee9ng<\/h2>\n<p>Tr\u01b0\u1edbc khi c\u1ea5p ngu\u1ed3n cho b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n\u00e0o, ba b\u01b0\u1edbc ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c s\u1ebd gi\u1ea3i quy\u1ebft m\u1ecdi th\u1eafc m\u1eafc v\u1ec1 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n, bao g\u1ed3m c\u1ea3 vi\u1ec7c x\u00e1c \u0111\u1ecbnh \u201cc\u1ef1c n\u00e0o l\u00e0 c\u1ef1c n\u00e0o\u201d tr\u00ean m\u1ed9t c\u00f4ng t\u1eafc kh\u00f4ng c\u00f3 k\u00fd hi\u1ec7u:<\/p>\n<ol>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c c\u1ef1c (t\u1eaft ngu\u1ed3n).<\/strong> Khi b\u1ed9 truy\u1ec1n \u0111\u1ed9ng \u1edf tr\u1ea1ng th\u00e1i ngh\u1ec9, ch\u1ebf \u0111\u1ed9 ki\u1ec3m tra li\u00ean t\u1ee5c c\u1ee7a m\u00e1y \u0111o s\u1ebd ph\u00e1t ra ti\u1ebfng b\u00edp khi n\u1ed1i gi\u1eefa COM v\u00e0 NC, v\u00e0 kh\u00f4ng ph\u00e1t ra ti\u1ebfng b\u00edp khi n\u1ed1i gi\u1eefa COM v\u00e0 NO. Nh\u1ea5n v\u00e0o b\u1ed9 truy\u1ec1n \u0111\u1ed9ng: ti\u1ebfng b\u00edp s\u1ebd chuy\u1ec3n sang \u0111o\u1ea1n COM\u2013NO. D\u00f9 nh\u00e3n ghi g\u00ec \u0111i ch\u0103ng n\u1eefa, m\u00e1y \u0111o l\u00fac n\u00e0y \u0111\u00e3 cho b\u1ea1n bi\u1ebft s\u1ef1 th\u1eadt.<\/li>\n<li><strong>Ki\u1ec3m tra xem c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng ch\u1eadp m\u1ea1ch kh\u00f4ng.<\/strong> H\u00e3y ki\u1ec3m tra xem c\u00f3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 s\u1ef1 d\u1eabn \u0111i\u1ec7n gi\u1eefa hai \u0111i\u1ec3m ti\u1ebfp x\u00fac c\u1ed1 \u0111\u1ecbnh hay kh\u00f4ng, v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 d\u1eabn \u0111i\u1ec7n t\u1eeb b\u1ea5t k\u1ef3 \u0111\u1ea7u n\u1ed1i n\u00e0o \u0111\u1ebfn th\u00e2n c\u00f4ng t\u1eafc (tr\u1eeb khi th\u00e2n c\u00f4ng t\u1eafc thu\u1ed9c lo\u1ea1i kim lo\u1ea1i n\u1ed1i \u0111\u1ea5t v\u00e0 c\u00f3 \u0111\u1ea7u n\u1ed1i \u0111\u1ea5t ri\u00eang).<\/li>\n<li><strong>Ki\u1ec3m tra m\u1ea1ch \u0111i\u1ec7n, \u0111\u00e3 c\u1ea5p ngu\u1ed3n.<\/strong> \u0110o ngang qua t\u1ea3i ho\u1eb7c t\u1ea1i \u0111\u1ea7u v\u00e0o. \u0110i\u1ec7n \u00e1p ho\u1eb7c tr\u1ea1ng th\u00e1i logic ph\u1ea3i thay \u0111\u1ed5i khi nh\u1ea5n b\u1ed9 truy\u1ec1n \u0111\u1ed9ng. Tr\u00ean \u0111\u1ea7u v\u00e0o PLC, \u0111\u00e8n LED \u0111\u1ea7u v\u00e0o c\u1ee7a bo m\u1ea1ch s\u1ebd l\u00e0 \u201cng\u01b0\u1eddi b\u1ea1n\u201d c\u1ee7a b\u1ea1n. \u0110\u00e8n n\u00e0y ph\u1ea3i s\u00e1ng \u1edf m\u1ed9t tr\u1ea1ng th\u00e1i v\u00e0 t\u1eaft khi c\u1ea7n g\u1ea1t k\u00edch ho\u1ea1t (<a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">c\u00e1ch kh\u1eafc ph\u1ee5c t\u01b0\u01a1ng t\u1ef1 \u0111\u00e3 k\u1ebft th\u00fac chu\u1ed7i th\u1ea3o lu\u1eadn tr\u00ean PLCTalk<\/a>).<\/li>\n<\/ol>\n<p>N\u1ebfu thi\u1ebft b\u1ecb v\u1eabn ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng b\u00ecnh th\u01b0\u1eddng, h\u00e3y tra c\u1ee9u c\u00e1c tri\u1ec7u ch\u1ee9ng thay v\u00ec xem l\u1ea1i s\u01a1 \u0111\u1ed3:<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Tri\u1ec7u ch\u1ee9ng<\/th><th>Nguy\u00ean nh\u00e2n c\u00f3 kh\u1ea3 n\u0103ng cao nh\u1ea5t<\/th><th>H\u00e0nh \u0111\u1ed9ng<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Kh\u00f4ng bao gi\u1edd ng\u1eebng \/ lu\u00f4n tr\u00e0n \u0111\u1ea7y n\u0103ng l\u01b0\u1ee3ng<\/td><td>\u0110\u00e3 k\u1ebft n\u1ed1i sai cho ch\u1ee9c n\u0103ng (NC v\u00e0 NO b\u1ecb \u0111\u1ea3o ng\u01b0\u1ee3c) ho\u1eb7c d\u00e2y chung b\u1ecb n\u1ed1i sai<\/td><td>X\u00e1c \u0111\u1ecbnh l\u1ea1i ch\u1ee9c n\u0103ng c\u1ee7a c\u00f4ng t\u1eafc (d\u1eebng hay s\u1ef1 ki\u1ec7n), sau \u0111\u00f3 ki\u1ec3m tra l\u1ea1i COM-NO-NC so v\u1edbi \u0111\u1ed3ng h\u1ed3 \u0111o<\/td><\/tr>\n<tr><td>\u0110\u00e8n LED \u0111\u1ea7u v\u00e0o \/ th\u1ebb kh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i<\/td><td>\u0110\u1ea7u v\u00e0o chung kh\u00f4ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i, ho\u1eb7c ch\u01b0\u01a1ng tr\u00ecnh \u0111\u1ecdc ti\u1ebfp \u0111i\u1ec3m ng\u01b0\u1ee3c l\u1ea1i<\/td><td>\u0110o \u0111i\u1ec7n \u00e1p t\u1ea1i \u0111\u1ea7u v\u00e0o; ho\u00e0n thi\u1ec7n m\u1ea1ch h\u1ed3i; ki\u1ec3m tra c\u00e1c ti\u1ebfp \u0111i\u1ec3m NO v\u00e0 NC trong m\u1ea1ch logic<\/td><\/tr>\n<tr><td>C\u00e1c s\u1ef1 c\u1ed1 gi\u00e1n \u0111o\u1ea1n ho\u1eb7c t\u00edn hi\u1ec7u \u1ea3o<\/td><td>\u0110\u1ea7u n\u1ed1i l\u1ecfng l\u1ebbo ho\u1eb7c hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng ti\u1ebfp x\u00fac v\u01b0\u1ee3t qua b\u1ed9 l\u1ecdc \u0111\u1ea7u v\u00e0o<\/td><td>Si\u1ebft ch\u1eb7t c\u00e1c \u0111\u1ea7u n\u1ed1i; t\u0103ng th\u1eddi gian l\u1ecdc \u0111\u1ea7u v\u00e0o (d\u1ea3i 4\u201312 ms)<\/td><\/tr>\n<tr><td>C\u00e1c \u0111i\u1ec3m ti\u1ebfp x\u00fac b\u1ecb ch\u00e1y ho\u1eb7c b\u1ecb h\u00e0n d\u00ednh<\/td><td>Gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c ti\u1ebfp x\u00fac th\u1ea5p h\u01a1n t\u1ea3i th\u1ef1c t\u1ebf (chuy\u1ec3n m\u1ea1ch m\u1ed9t chi\u1ec1u ho\u1eb7c chuy\u1ec3n m\u1ea1ch c\u1ea3m \u1ee9ng)<\/td><td>Chuy\u1ec3n sang ph\u1ea7n ngu\u1ed3n \u0111i\u1ec7n b\u00ean d\u01b0\u1edbi: c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c cao h\u01a1n ho\u1eb7c r\u01a1le trung gian<\/td><\/tr>\n<tr><td>V\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n<\/td><td>Kh\u00f4ng c\u00f3 d\u00e2y k\u1ebft n\u1ed1i n\u00e0o \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t cho ch\u1ee9c n\u0103ng d\u1eebng c\u00f4ng vi\u1ec7c, v\u00e0 d\u00e2y \u0111\u00e3 b\u1ecb \u0111\u1ee9t<\/td><td>C\u00e0i \u0111\u1eb7t l\u1ea1i d\u00e2y \u0111i\u1ec7n th\u00e0nh ch\u1ebf \u0111\u1ed9 NC. N\u1ebfu c\u00f3 d\u00e2y b\u1ecb \u0111\u1ee9t, m\u00e1y ph\u1ea3i ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>V\u00e0 khi m\u00e1y ho\u1ea1t \u0111\u1ed9ng nh\u01b0ng ph\u1ea7n m\u1ec1m kh\u00f4ng t\u01b0\u01a1ng th\u00edch v\u1edbi ph\u1ea7n c\u1ee9ng \u2014 t\u1ee9c l\u00e0 gi\u1edbi h\u1ea1n ph\u1ea7n c\u1ee9ng ho\u1ea1t \u0111\u1ed9ng trong khi gi\u1edbi h\u1ea1n ph\u1ea7n m\u1ec1m l\u1ea1i kh\u00f4ng \u2014 th\u00ec v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf ch\u01b0\u01a1ng tr\u00ecnh, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u1edf h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn. H\u00e3y gi\u1eef nguy\u00ean gi\u1edbi h\u1ea1n ph\u1ea7n m\u1ec1m v\u00e0 c\u00f4ng t\u1eafc v\u1eadt l\u00fd \u0111\u1ec3 \u0111o l\u01b0\u1eddng <em>c\u0169ng v\u1eady<\/em> \u0111i\u1ec3m, v\u00e0 ki\u1ec3m tra ch\u00fang c\u00f9ng nhau, ch\u1ee9 kh\u00f4ng ph\u1ea3i ri\u00eang r\u1ebd.<\/p>\n\n<h2>T\u1eeb s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111\u1ebfn m\u00e3 s\u1ea3n ph\u1ea9m: C\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ea7n ki\u1ec3m tra tr\u01b0\u1edbc khi mua<\/h2>\n<p>\u0110\u1ecdc s\u01a1 \u0111\u1ed3 theo chi\u1ec1u thu\u1eadn s\u1ebd gi\u00fap b\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c m\u1ed9t m\u1ea1ch \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng. \u0110\u1ecdc theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i s\u1ebd gi\u00fap b\u1ea1n t\u00ecm \u0111\u01b0\u1ee3c linh ki\u1ec7n thay th\u1ebf ph\u00f9 h\u1ee3p. \u0110\u00e2y l\u00e0 b\u01b0\u1edbc m\u00e0 h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 h\u01b0\u1edbng d\u1eabn \u0111\u1ea5u d\u00e2y n\u00e0o \u0111\u1ec1 c\u1eadp \u0111\u1ebfn, b\u1edfi v\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 l\u00fac m\u00e3 linh ki\u1ec7n, ch\u1ee9 kh\u00f4ng ph\u1ea3i tu\u1ed1c-n\u01a1-v\u00edt, m\u1edbi l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh.<\/p>\n<h3>H\u00e3y \u0111\u1ecdc c\u00e1c k\u00fd hi\u1ec7u li\u00ean h\u1ec7 tr\u01b0\u1edbc khi xem danh m\u1ee5c<\/h3>\n<p>M\u1ed7i s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n \u0111\u1ec1u th\u1ec3 hi\u1ec7n c\u00e1c y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt. H\u00e3y \u0111\u1ebfm s\u1ed1 bi\u1ec3u t\u01b0\u1ee3ng c\u00f4ng t\u1eafc. L\u01b0u \u00fd xem m\u1ed7i c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c v\u1ebd v\u1edbi ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf hay th\u01b0\u1eddng \u0111\u00f3ng (bi\u1ec3u t\u01b0\u1ee3ng s\u1ebd cho b\u1ea1n bi\u1ebft, v\u00ec v\u1eady \u0111\u1eebng \u0111o\u00e1n d\u1ef1a tr\u00ean n\u1ed9i dung v\u0103n b\u1ea3n). X\u00e1c \u0111\u1ecbnh xem m\u1ed7i c\u00f4ng t\u1eafc c\u00f3 ch\u1ee9c n\u0103ng chuy\u1ec3n m\u1ea1ch ngu\u1ed3n hay c\u1ea5p t\u00edn hi\u1ec7u v\u00e0o. Hai bi\u1ec3u t\u01b0\u1ee3ng c\u00f4ng t\u1eafc v\u00e0 m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng r\u01a1-le c\u00f3 ngh\u0129a l\u00e0 c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn hai m\u1ea1ch; m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng c\u00f4ng t\u1eafc c\u1ea5p t\u00edn hi\u1ec7u v\u00e0o cho PLC c\u00f3 ngh\u0129a l\u00e0 c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn t\u00edn hi\u1ec7u. Ph\u1ee5 t\u00f9ng b\u1ea1n mua ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi s\u1ed1 l\u01b0\u1ee3ng m\u1ea1ch v\u00e0 tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m m\u00e0 m\u1ed7i m\u1ea1ch y\u00eau c\u1ea7u.<\/p>\n<h3>\u0110\u00e1nh gi\u00e1 ti\u1ebfp x\u00fac: V\u1ea5n \u0111\u1ec1 sinh t\u1eed trong l\u0129nh v\u1ef1c \u0111i\u1ec7n n\u0103ng<\/h3>\n<p>N\u1ebfu c\u00f4ng t\u1eafc ng\u1eaft tr\u1ef1c ti\u1ebfp \u0111\u1ed9ng c\u01a1, \u0111i\u1ec7n t\u1eeb, cu\u1ed9n d\u00e2y c\u00f4ng t\u1eafc t\u01a1 ho\u1eb7c b\u00f3ng \u0111\u00e8n, th\u00ec th\u00f4ng s\u1ed1 \u0111\u1ecbnh m\u1ee9c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a n\u00f3 ch\u00ednh l\u00e0 gi\u1edbi h\u1ea1n an to\u00e0n c\u1ee7a to\u00e0n b\u1ed9 thi\u1ebft k\u1ebf. Ba nguy\u00ean t\u1eafc sau \u0111\u00e2y gi\u00fap ng\u01b0\u1eddi mua tr\u00e1nh \u0111\u01b0\u1ee3c r\u1eafc r\u1ed1i:<\/p>\n<ul>\n<li><strong>Ch\u1ec9 s\u1ed1 n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ea3i, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t con s\u1ed1 c\u1ed1 \u0111\u1ecbnh.<\/strong> M\u1ed9t c\u00f4ng t\u1eafc c\u00f3 th\u1ec3 ng\u1eaft \u0111\u01b0\u1ee3c t\u1ea3i AC \u0111i\u1ec7n tr\u1edf 10 A m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng c\u00f3 th\u1ec3 kh\u00f4ng ng\u1eaft \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n 2 A c\u1ee7a \u0111\u1ed9ng c\u01a1 DC. Do d\u00f2ng \u0111i\u1ec7n DC kh\u00f4ng c\u00f3 \u0111i\u1ec3m giao c\u1eaft tr\u1ee5c \u0111\u1ec3 d\u1eadp t\u1eaft h\u1ed3 quang, n\u00ean c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t th\u01b0\u1eddng h\u1ea1 m\u1ee9c \u0111\u1ecbnh m\u1ee9c cho d\u00f2ng \u0111i\u1ec7n DC xu\u1ed1ng th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi m\u1ee9c \u0111\u1ecbnh m\u1ee9c cho d\u00f2ng \u0111i\u1ec7n AC.<\/li>\n<li><strong>C\u00e1c con s\u1ed1 th\u1ef1c t\u1ebf tr\u00f4ng nh\u01b0 th\u1ebf n\u00e0y.<\/strong> M\u1ed9t c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n ki\u1ec3u con l\u0103n-c\u1ea7n g\u1ea1t ch\u1ecbu t\u1ea3i n\u1eb7ng \u0111i\u1ec3n h\u00ecnh c\u00f3 \u0111\u1ecbnh m\u1ee9c 10 A \u1edf 250 VAC \u0111\u1ed1i v\u1edbi t\u1ea3i \u0111i\u1ec7n tr\u1edf (c\u1ea3 NC v\u00e0 NO), 3 A \u1edf 480 VAC v\u00e0 ch\u1ec9 0,25 A \u1edf 250 VDC (<a href=\"https:\/\/www.omch.com\/vi\/az-7100\/\">V\u00ed d\u1ee5 v\u1ec1 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt AZ-7100<\/a>). M\u1ed9t b\u1ed9 truy\u1ec1n \u0111\u1ed9ng d\u1ecdc nh\u1ecf g\u1ecdn thu\u1ed9c c\u00f9ng d\u00f2ng s\u1ea3n ph\u1ea9m trong danh m\u1ee5c n\u00e0y c\u00f3 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c 5 A \u1edf \u0111i\u1ec7n \u00e1p 250 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf) v\u00e0 ch\u1ec9 0,2 A \u1edf \u0111i\u1ec7n \u00e1p 250 VDC (<a href=\"https:\/\/www.omch.com\/vi\/tz-8108\/\">V\u00ed d\u1ee5 v\u1ec1 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a TZ-8108<\/a>). N\u1ebfu t\u1ea3i c\u1ee7a b\u1ea1n l\u00e0 m\u1ed9t \u0111i\u1ec7n t\u1eeb m\u1ed9t chi\u1ec1u ho\u1eb7c m\u1ed9t \u0111\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u nh\u1ecf, h\u00e3y so s\u00e1nh v\u1edbi <strong>Chuy\u00ean m\u1ee5c DC<\/strong>, ch\u1ee9 kh\u00f4ng ph\u1ea3i con s\u1ed1 250 VAC \u0111\u01b0\u1ee3c ghi tr\u00ean nh\u00e3n.<\/li>\n<li><strong>C\u00e1c t\u1ea3i c\u1ea3m \u1ee9ng c\u1ea7n gi\u1ea3m c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c ho\u1eb7c s\u1eed d\u1ee5ng r\u01a1le trung gian.<\/strong> Cu\u1ed9n d\u00e2y c\u1ee7a c\u00f4ng t\u1eafc \u0111i\u1ec7n \u0111\u1ed9ng c\u01a1 v\u00e0 cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb l\u00e0 c\u00e1c linh ki\u1ec7n c\u1ea3m \u1ee9ng. Khi ng\u1eaft m\u1ea1ch, ch\u00fang t\u1ea1o ra tia l\u1eeda \u0111i\u1ec7n v\u00e0 l\u00e0m h\u00e0n d\u00ednh c\u00e1c ti\u1ebfp \u0111i\u1ec3m, khi\u1ebfn c\u00e1c ti\u1ebfp \u0111i\u1ec3m n\u00e0y c\u00f3 tu\u1ed5i th\u1ecd cao h\u01a1n c\u1ea3 tu\u1ed5i th\u1ecd c\u1ee7a b\u1ea1n khi ho\u1ea1t \u0111\u1ed9ng v\u1edbi t\u1ea3i \u0111i\u1ec7n tr\u1edf (<a href=\"https:\/\/plcprogramming.io\/blog\/limit-switch-explained\">PLCprogramming.io<\/a>). C\u00e1ch l\u00e0m ti\u00eau chu\u1ea9n l\u00e0: \u0111\u1ec3 c\u00f4ng t\u1eafc \u0111i\u1ec1u khi\u1ec3n cu\u1ed9n d\u00e2y c\u1ee7a r\u01a1le ho\u1eb7c c\u00f4ng t\u1eafc t\u01a1, v\u00e0 \u0111\u1ec3 ch\u00fang th\u1ef1c hi\u1ec7n vi\u1ec7c chuy\u1ec3n m\u1ea1ch ngu\u1ed3n. V\u1ec1 m\u1eb7t c\u01a1 h\u1ecdc, \u0111\u00e2y c\u0169ng ch\u00ednh l\u00e0 v\u1ecb tr\u00ed ph\u00f9 h\u1ee3p nh\u1ea5t \u0111\u1ec3 l\u1eafp \u0111\u1eb7t c\u00f4ng t\u1eafc ngay t\u1eeb \u0111\u1ea7u.<\/li>\n<\/ul>\n\n\n<div class=\"bp-3-ratings\">\n<p class=\"bp-3-title\"><span class=\"bp-3-title-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"13 2 3 14 12 14 11 22 21 10 12 10 13 2\"\/><\/svg><\/span>T\u1ed5ng quan v\u1ec1 c\u00e1c m\u1ee9c \u0111\u1ecbnh m\u1ee9c ti\u1ebfp x\u00fac \u2014 xem c\u1ed9t DC<\/p>\n<div class=\"bp-3-grid\">\n<div class=\"bp-3-unit\">\n<p class=\"bp-3-unit-head\">C\u1ea7n g\u1ea1t con l\u0103n ch\u1ecbu t\u1ea3i n\u1eb7ng<\/p>\n<p class=\"bp-3-line\"><span>250 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf)<\/span><span class=\"bp-3-num\">10 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>480 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf)<\/span><span class=\"bp-3-num\">3 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>250 VDC<\/span><span class=\"bp-3-num\">0,25 A<\/span><\/p>\n<\/div>\n<div class=\"bp-3-unit\">\n<p class=\"bp-3-unit-head\">Thi\u1ebft k\u1ebf nh\u1ecf g\u1ecdn v\u1edbi c\u01a1 ch\u1ebf di chuy\u1ec3n d\u1ecdc<\/p>\n<p class=\"bp-3-line\"><span>250 VAC (t\u1ea3i \u0111i\u1ec7n tr\u1edf)<\/span><span class=\"bp-3-num\">5 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>125 volt m\u1ed9t chi\u1ec1u<\/span><span class=\"bp-3-num\">0,4 A<\/span><\/p>\n<p class=\"bp-3-line\"><span>250 VDC<\/span><span class=\"bp-3-num\">0,2 A<\/span><\/p>\n<\/div>\n<\/div>\n<p class=\"bp-3-foot\">Cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb v\u00e0 \u0111\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u: h\u00e3y so s\u00e1nh v\u1edbi c\u1ed9t \u201cDC\u201d, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u1edbi ti\u00eau \u0111\u1ec1 \u201c250 VAC\u201d.<\/p>\n<\/div>\n\n<h3>Cu\u1ed9c s\u1ed1ng, b\u1ed9 truy\u1ec1n \u0111\u1ed9ng v\u00e0 l\u1ed9 tr\u00ecnh thay th\u1ebf<\/h3>\n<p>Tr\u00ean b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f3 hai ch\u1ec9 s\u1ed1 v\u1ec1 tu\u1ed5i th\u1ecd, v\u00e0 hai ch\u1ec9 s\u1ed1 n\u00e0y kh\u00f4ng th\u1ec3 thay th\u1ebf cho nhau. <strong>Tu\u1ed5i th\u1ecd \u0111i\u1ec7n<\/strong>, s\u1ed1 l\u1ea7n ho\u1ea1t \u0111\u1ed9ng \u1edf m\u1ee9c t\u1ea3i \u0111\u1ecbnh m\u1ee9c t\u1ed1i \u0111a, l\u00e0 con s\u1ed1 d\u00f9ng \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n kho\u1ea3ng th\u1eddi gian thay th\u1ebf; \u0111\u1ed1i v\u1edbi c\u00e1c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u00f4ng nghi\u1ec7p, d\u1ef1 ki\u1ebfn s\u1ebd thu\u1ed9c lo\u1ea1i c\u00f3 tu\u1ed5i th\u1ecd 500.000 l\u1ea7n ho\u1ea1t \u0111\u1ed9ng. <strong>Tu\u1ed5i th\u1ecd c\u01a1 h\u1ecdc<\/strong>, trong tr\u01b0\u1eddng h\u1ee3p chuy\u1ec3n m\u1ea1ch kh\u00f4ng t\u1ea3i, con s\u1ed1 n\u00e0y cao h\u01a1n r\u1ea5t nhi\u1ec1u, th\u01b0\u1eddng l\u00ean \u0111\u1ebfn h\u00e0ng tri\u1ec7u l\u1ea7n. N\u1ebfu b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u1ec9 n\u00eau con s\u1ed1 c\u01a1 h\u1ecdc t\u00ednh b\u1eb1ng h\u00e0ng tri\u1ec7u, h\u00e3y coi \u0111\u00f3 l\u00e0 th\u00f4ng tin qu\u1ea3ng c\u00e1o cho \u0111\u1ebfn khi c\u00f3 th\u00f4ng s\u1ed1 v\u1ec1 tu\u1ed5i th\u1ecd \u0111i\u1ec7n \u0111\u01b0\u1ee3c ghi k\u00e8m b\u00ean c\u1ea1nh.<\/p>\n<p>B\u1ed9 truy\u1ec1n \u0111\u1ed9ng quy\u1ebft \u0111\u1ecbnh c\u00e1ch th\u1ee9c c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t: c\u1ea7n g\u1ea1t con l\u0103n d\u00e0nh cho c\u01a1 c\u1ea5u cam v\u00e0 d\u1ed1c (v\u00e0 l\u00e0 ki\u1ec3u ph\u1ed5 bi\u1ebfn nh\u1ea5t trong c\u00f4ng nghi\u1ec7p), p\u00edt-t\u00f4ng d\u00e0nh cho ti\u1ebfp x\u00fac tr\u1ef1c di\u1ec7n, v\u00e0 \u0111\u1ea7u d\u00f2 d\u1ea1ng s\u1ee3i d\u00e0nh cho c\u1ea3m bi\u1ebfn \u0111a h\u01b0\u1edbng nh\u1eb9. Nhi\u1ec1u th\u00e2n c\u00f4ng t\u1eafc h\u1ed7 tr\u1ee3 \u0111\u1ea7u c\u00f3 th\u1ec3 thay th\u1ebf, do \u0111\u00f3 khi c\u1ea7n thay th\u1ebf, ng\u01b0\u1eddi ta th\u01b0\u1eddng ch\u1ec9 thay \u0111\u1ea7u thay v\u00ec thay c\u1ea3 c\u00f4ng t\u1eafc. H\u00e3y ki\u1ec3m tra c\u00e1ch l\u1eafp \u0111\u1eb7t v\u00e0 h\u01b0\u1edbng ho\u1ea1t \u0111\u1ed9ng tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng.<\/p>\n<p>Vi\u1ec7c thay th\u1ebf sau \u0111\u00f3 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n theo hai h\u01b0\u1edbng: s\u1eed d\u1ee5ng m\u00e3 s\u1ea3n ph\u1ea9m gi\u1ed1ng h\u1ec7t ho\u1eb7c thay th\u1ebf b\u1eb1ng s\u1ea3n ph\u1ea9m c\u00f3 c\u00e1c th\u00f4ng s\u1ed1 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng. \u0110\u1ed1i v\u1edbi ph\u01b0\u01a1ng \u00e1n thay th\u1ebf, h\u00e3y ki\u1ec3m tra <strong>s\u1ed1 l\u01b0\u1ee3ng m\u1ea1ch v\u00e0 tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m, \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c v\u00e0 lo\u1ea1i d\u00f2ng \u0111i\u1ec7n (AC so v\u1edbi DC), tu\u1ed5i th\u1ecd \u0111i\u1ec7n, c\u1ea5p b\u1ea3o v\u1ec7 IP cho m\u00f4i tr\u01b0\u1eddng, v\u00e0 ki\u1ec3u b\u1ed9 truy\u1ec1n \u0111\u1ed9ng<\/strong> kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u trong s\u01a1 \u0111\u1ed3. Khi c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn \u0111\u1ea7u v\u00e0o m\u1ee9c t\u00edn hi\u1ec7u, \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n h\u1ea7u nh\u01b0 kh\u00f4ng quan tr\u1ecdng, trong khi c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i l\u1ea1i r\u1ea5t quan tr\u1ecdng.<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>Vai tr\u00f2 c\u1ee7a m\u1ea1ch<\/th><th>C\u00e1c th\u00f4ng s\u1ed1 quy\u1ebft \u0111\u1ecbnh chi ti\u1ebft<\/th><th>Khi c\u00e1c gi\u1ea3 \u0111\u1ecbnh c\u1ee7a vai tr\u00f2 n\u00e0y kh\u00f4ng c\u00f2n \u0111\u00fang n\u1eefa<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Ch\u1ebf \u0111\u1ed9 Power-through (c\u00f4ng t\u1eafc ng\u1eaft ngu\u1ed3n c\u1ea5p cho t\u1ea3i)<\/td><td>\u0110i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c, d\u00f2ng xoay chi\u1ec1u (AC) so v\u1edbi d\u00f2ng m\u1ed9t chi\u1ec1u (DC), tu\u1ed5i th\u1ecd \u0111i\u1ec7n<\/td><td>T\u1ea3i c\u1ea3m \u1ee9ng m\u1ed9t chi\u1ec1u ho\u1eb7c t\u1ea3i c\u00f3 d\u00f2ng kh\u1edfi \u0111\u1ed9ng cao: chuy\u1ec3n sang s\u1eed d\u1ee5ng r\u01a1le\/c\u00f4ng t\u1eafc t\u01a1 \u0111\u1ec3 chuy\u1ec3n m\u1ea1ch. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a c\u00f4ng t\u1eafc kh\u00f4ng c\u00f2n \u0111\u1ee7 \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u<\/td><\/tr>\n<tr><td>M\u1ee9c t\u00edn hi\u1ec7u (c\u00f4ng t\u1eafc c\u1ea5p t\u00edn hi\u1ec7u v\u00e0o \u0111\u1ea7u v\u00e0o c\u1ee7a PLC\/b\u1ed9 \u0111i\u1ec1u khi\u1ec3n)<\/td><td>C\u1ea5u h\u00ecnh \u0111\u1ea7u cu\u1ed1i (NO\/NC\/COM), tu\u1ed5i th\u1ecd c\u01a1 h\u1ecdc, ki\u1ec3u b\u1ed9 truy\u1ec1n \u0111\u1ed9ng<\/td><td>N\u1ebfu c\u00f4ng t\u1eafc \u0111\u00f3 c\u0169ng ph\u1ea3i ng\u1eaft ngu\u1ed3n \u0111i\u1ec7n. M\u1ed9t b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecbu t\u00edn hi\u1ec7u kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecbu t\u1ea3i \u0111i\u1ec7n<\/td><\/tr>\n<tr><td>Ph\u1ea3n h\u1ed3i hai m\u1ea1ch (v\u1ecb tr\u00ed c\u1eeda\/van)<\/td><td>S\u1ed1 l\u01b0\u1ee3ng m\u1ea1ch \u0111\u1ed9c l\u1eadp, tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m tr\u00ean m\u1ed7i m\u1ea1ch<\/td><td>Kh\u00f4ng gian h\u1eb9p ho\u1eb7c t\u1ea7n s\u1ed1 r\u1ea5t cao: c\u00f4ng t\u1eafc vi m\u00f4 ho\u1eb7c c\u1ea3m bi\u1ebfn kh\u00f4ng ti\u1ebfp x\u00fac c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p h\u01a1n<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h2>\u0110i\u1ec1u n\u00e0y c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i \u0111ang nh\u1eadp kho c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n thay th\u1ebf<\/h2>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i v\u00e0 b\u00e1n bu\u00f4n ho\u1ea1t \u0111\u1ed9ng trong l\u0129nh v\u1ef1c s\u1eeda ch\u1eefa v\u00e0 b\u1ea3o tr\u00ec, c\u00e1c s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n \u1edf tr\u00ean kh\u00f4ng ch\u1ec9 l\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o; ch\u00fang ch\u00ednh l\u00e0 c\u00e2u h\u1ecfi \u0111\u1ea7u ti\u00ean trong m\u1ecdi cu\u1ed9c g\u1ecdi y\u00eau c\u1ea7u h\u1ed7 tr\u1ee3. Khi kh\u00e1ch h\u00e0ng n\u00f3i \u201cc\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n b\u1ecb h\u1ecfng\u201d, c\u00e2u tr\u1ea3 l\u1eddi h\u1eefu \u00edch kh\u00f4ng ph\u1ea3i l\u00e0 \u201cm\u1eabu n\u00e0o?\u201d m\u00e0 l\u00e0 \u201c<strong>C\u00f4ng t\u1eafc n\u00e0y c\u00f3 \u0111\u01b0\u1ee3c n\u1ed1i tr\u1ef1c ti\u1ebfp v\u1edbi \u0111\u1ed9ng c\u01a1 hay cu\u1ed9n d\u00e2y kh\u00f4ng, hay n\u00f3 c\u1ea5p ngu\u1ed3n cho b\u1ed9 \u0111i\u1ec1u khi\u1ec3n? V\u00e0 n\u00f3 c\u00f3 c\u1ea7n ph\u1ea3i ng\u1eaft ho\u1ea1t \u0111\u1ed9ng hay ch\u1ec9 \u0111\u1ec3 ph\u00e1t t\u00edn hi\u1ec7u?<\/strong>\u201d C\u00e2u h\u1ecfi \u0111\u00f3 s\u1ebd h\u01b0\u1edbng d\u1eabn kh\u00e1ch h\u00e0ng \u0111\u1ebfn b\u01b0\u1edbc ki\u1ec3m tra s\u1ef1 c\u1ed1 ph\u00f9 h\u1ee3p. Kh\u00e1ch h\u00e0ng \u1edf ph\u00eda ngu\u1ed3n \u0111i\u1ec7n c\u00f3 nguy c\u01a1 g\u1eb7p s\u1ef1 c\u1ed1 li\u00ean quan \u0111\u1ebfn th\u00f4ng s\u1ed1 \u0111\u1ecbnh m\u1ee9c ti\u1ebfp \u0111i\u1ec3m (h\u00e0ng \u201cti\u1ebfp \u0111i\u1ec3m b\u1ecb ch\u00e1y\u201d trong b\u1ea3ng tri\u1ec7u ch\u1ee9ng). Kh\u00e1ch h\u00e0ng \u1edf ph\u00eda t\u00edn hi\u1ec7u c\u00f3 nguy c\u01a1 g\u1eb7p s\u1ef1 c\u1ed1 li\u00ean quan \u0111\u1ebfn tr\u1ea1ng th\u00e1i ti\u1ebfp \u0111i\u1ec3m v\u00e0 c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i (h\u00e0ng \u201ckh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i\u201d).<\/p>\n<p>\u0110\u00f3 c\u0169ng l\u00e0 l\u00fd do gi\u1ea3i th\u00edch cho c\u00e1ch th\u1ee9c qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho. M\u1ed9t n\u1ec1n t\u1ea3ng SPDT ch\u1ecbu t\u1ea3i n\u1eb7ng, c\u00f9ng m\u1ed9t d\u00f2ng th\u00e2n s\u1ea3n ph\u1ea9m \u00e1p d\u1ee5ng cho c\u1ea3 \u0111\u1ea7u \u0111i\u1ec1u khi\u1ec3n d\u1ea1ng con l\u0103n v\u00e0 d\u1ea1ng p\u00edt-t\u00f4ng, v\u1edbi c\u1ea3 hai tr\u1ea1ng th\u00e1i NO v\u00e0 NC \u0111\u1ec1u \u0111\u01b0\u1ee3c cung c\u1ea5p, gi\u00fap \u0111\u00e1p \u1ee9ng c\u1ea3 hai ch\u1ee9c n\u0103ng m\u1ea1ch t\u1eeb m\u1ed9t d\u00f2ng s\u1ea3n ph\u1ea9m duy nh\u1ea5t. Kh\u00e1ch h\u00e0ng s\u1eed d\u1ee5ng cho m\u1ea1ch ngu\u1ed3n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u1ee9ng minh cho tuy\u00ean b\u1ed1 \u0111\u00f3. Kh\u00e1ch h\u00e0ng s\u1eed d\u1ee5ng cho m\u1ea1ch t\u00edn hi\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i. C\u00e1c trang danh m\u1ee5c s\u1ea3n ph\u1ea9m c\u00f4ng b\u1ed1 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 tu\u1ed5i th\u1ecd ngay b\u00ean c\u1ea1nh m\u00e3 s\u1ea3n ph\u1ea9m, gi\u1ed1ng nh\u01b0 c\u00e1ch c\u00e1c b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt l\u00e0m, cho ph\u00e9p nh\u00e0 ph\u00e2n ph\u1ed1i tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi v\u1ec1 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt m\u00e0 kh\u00f4ng c\u1ea7n g\u1ecdi \u0111i\u1ec7n. \u0110\u00f3 ch\u00ednh x\u00e1c l\u00e0 kho\u1ea3ng tr\u1ed1ng d\u1ecbch v\u1ee5 m\u00e0 n\u1ed9i dung s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y hi\u1ec7n t\u1ea1i tr\u00ean web \u0111\u1ec3 l\u1ea1i: c\u00e1c h\u01b0\u1edbng d\u1eabn d\u1ea1y b\u1ea1n c\u00e1ch \u0111\u1ea5u d\u00e2y, nh\u01b0ng h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 h\u01b0\u1edbng d\u1eabn n\u00e0o cho b\u1ea1n bi\u1ebft n\u00ean y\u00eau c\u1ea7u g\u00ec t\u1eeb linh ki\u1ec7n m\u00e0 b\u1ea1n s\u1eafp mua. Quy\u1ebft \u0111\u1ecbnh cu\u1ed1i c\u00f9ng v\u1eabn thu\u1ed9c v\u1ec1 m\u1ea1ch \u0111i\u1ec7n c\u1ee7a ch\u00ednh kh\u00e1ch h\u00e0ng. B\u00e0i vi\u1ebft n\u00e0y cung c\u1ea5p cho b\u1ea1n nh\u1eefng c\u00e2u h\u1ecfi c\u1ea7n \u0111\u1eb7t ra, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u00e2u tr\u1ea3 l\u1eddi thay m\u1eb7t h\u1ecd. C\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i c\u00f3 th\u1ec3 \u0111\u1eb7t nh\u1eefng c\u00e2u h\u1ecfi n\u00e0y b\u1eb1ng ng\u00f4n ng\u1eef c\u1ee7a kh\u00e1ch h\u00e0ng s\u1ebd bi\u1ebfn m\u1ed9t c\u00e2u h\u1ecfi v\u1ec1 \u0111\u1ea5u d\u00e2y th\u00e0nh m\u1ed9t giao d\u1ecbch b\u00e1n h\u00e0ng.<\/p>\n<p><em>N\u1ebfu qu\u00fd kh\u00e1ch \u0111ang so s\u00e1nh c\u00e1c d\u00f2ng c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n v\u00e0 mu\u1ed1n tham kh\u1ea3o b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f3 ghi r\u00f5 th\u00f4ng s\u1ed1 \u0111\u1ecbnh m\u1ee9c ti\u1ebfp \u0111i\u1ec3m, tu\u1ed5i th\u1ecd v\u00e0 c\u00e1c t\u00f9y ch\u1ecdn b\u1ed9 truy\u1ec1n \u0111\u1ed9ng (\u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 ch\u00ednh th\u1ee9c ch\u1ee9 kh\u00f4ng ph\u1ea3i ch\u1ec9 l\u00e0 b\u00e1o gi\u00e1), danh m\u1ee5c c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u1ee7a OMCH li\u1ec7t k\u00ea c\u00e1c d\u00f2ng s\u1ea3n ph\u1ea9m ch\u1ecbu t\u1ea3i n\u1eb7ng v\u00e0 d\u00f2ng s\u1ea3n ph\u1ea9m nh\u1ecf g\u1ecdn k\u00e8m theo b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u1ea7y \u0111\u1ee7. Qu\u00fd kh\u00e1ch c\u00f3 th\u1ec3 tham kh\u1ea3o danh m\u1ee5c s\u1ea3n ph\u1ea9m ho\u1eb7c g\u1eedi chi ti\u1ebft m\u1ea1ch \u0111i\u1ec7n c\u1ee7a m\u00ecnh \u0111\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t ph\u00f9 h\u1ee3p v\u1edbi s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y.<\/em><\/p>\n\n\n<div class=\"bp-cta-end\">\n<p class=\"bp-cta-end-title\"><span class=\"bp-cta-end-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.536 21.686a.5.5 0 0 0 .937-.024l6.5-19a.496.496 0 0 0-.635-.635l-19 6.5a.5.5 0 0 0-.024.937l7.93 3.18a2 2 0 0 1 1.112 1.11z\"\/><path d=\"m21.854 2.147-10.94 10.939\"\/><\/svg><\/span>G\u1eedi c\u00e2u h\u1ecfi v\u1ec1 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n \u2014 Nh\u1eadn c\u00f4ng t\u1eafc ph\u00f9 h\u1ee3p<\/p>\n<p class=\"bp-cta-end-sub\">Vui l\u00f2ng cho ch\u00fang t\u00f4i bi\u1ebft c\u00f4ng t\u1eafc n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng d\u1eebng \u0111\u1ed9ng c\u01a1 tr\u1ef1c ti\u1ebfp hay cung c\u1ea5p t\u00edn hi\u1ec7u cho \u0111\u1ea7u v\u00e0o b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, v\u00e0 li\u1ec7u c\u00f4ng t\u1eafc n\u00e0y c\u00f3 b\u1eaft bu\u1ed9c ph\u1ea3i d\u1eebng \u0111\u1ed9ng c\u01a1 hay ch\u1ec9 c\u1ea7n ph\u00e1t t\u00edn hi\u1ec7u. C\u00e1c k\u1ef9 s\u01b0 c\u1ee7a ch\u00fang t\u00f4i s\u1ebd ki\u1ec3m tra th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a ti\u1ebfp \u0111i\u1ec3m v\u00e0 c\u1ea5u h\u00ecnh \u0111\u1ea7u n\u1ed1i d\u1ef1a tr\u00ean s\u01a1 \u0111\u1ed3 m\u1ea1ch c\u1ee7a qu\u00fd kh\u00e1ch tr\u01b0\u1edbc khi qu\u00fd kh\u00e1ch \u0111\u1eb7t h\u00e0ng.<\/p>\n<a class=\"bp-cta-end-btn\" href=\"https:\/\/www.omch.com\/vi\/contact\/\" target=\"_self\">Nh\u1eadn b\u00e1o gi\u00e1 ph\u00f9 h\u1ee3p v\u1edbi h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n<\/a>\n<\/div>\n\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol class=\"bd-refs\">\n<li><a href=\"https:\/\/plcprogramming.io\/blog\/limit-switch-explained\">PLCprogramming.io. \u201cGi\u1ea3i th\u00edch v\u1ec1 c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n | C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng + C\u00e1ch \u0111\u1ea5u d\u00e2y PLC.\u201d Th\u00e1ng 6 n\u0103m 2026.<\/a><\/li>\n<li><a href=\"https:\/\/tameson.com\/pages\/limit-switch\">Tameson. \u201cH\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n.\u201d Th\u00e1ng 1 n\u0103m 2024.<\/a><\/li>\n<li><a href=\"https:\/\/www.chiefdelphi.com\/t\/wiring-this-limit-switch\/492163\">Chief Delphi. \u201cC\u00e1ch n\u1ed1i d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n n\u00e0y\u201d (ch\u1ee7 \u0111\u1ec1 tr\u00ean di\u1ec5n \u0111\u00e0n FIRST Robotics). Th\u00e1ng 2 n\u0103m 2025.<\/a><\/li>\n<li><a href=\"https:\/\/forum.arduino.cc\/t\/how-to-wire-limit-switch-safely-and-read-switch-status\/1430294\">Di\u1ec5n \u0111\u00e0n Arduino. \u201cC\u00e1ch \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n an to\u00e0n v\u00e0 \u0111\u1ecdc tr\u1ea1ng th\u00e1i c\u00f4ng t\u1eafc.\u201d Th\u00e1ng 2 n\u0103m 2026.<\/a><\/li>\n<li><a href=\"https:\/\/www.plctalk.net\/forums\/threads\/s7-1200-limit-switch-wiring.133144\/\">PLCTalk. \u201cC\u00e1ch \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n S7-1200.\u201d Th\u00e1ng 6 n\u0103m 2022.<\/a><\/li>\n<li><a href=\"https:\/\/www.reddit.com\/r\/PLC\/comments\/1bhn3y0\/limit_switch_logic\/\">r\/PLC. \u201cLogic c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n.\u201d Th\u00e1ng 3 n\u0103m 2024.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/limit-switch\/\">OMCH. Danh m\u1ee5c s\u1ea3n ph\u1ea9m \u201cC\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n\u201d.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/az-7100\/\">OMCH. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n c\u1ea7n g\u1ea1t con l\u0103n ch\u1ecbu t\u1ea3i n\u1eb7ng \u201cAZ-7100\u201d.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/tz-8108\/\">OMCH. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n nh\u1ecf g\u1ecdn \u201cTZ-8108\u201d.<\/a><\/li>\n<\/ol>\n<\/article>\n<\/div>\n\n<\/body><\/html>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>S\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n: C\u00e1ch \u0111\u1ea5u d\u00e2y c\u00e1c c\u1ef1c NO, NC v\u00e0 c\u1ef1c chung trong m\u1ea1ch \u0111\u1ed9ng c\u01a1, PLC v\u00e0 m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n. S\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y c\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n tr\u00f4ng c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n: ba c\u1ef1c, v\u00e0i \u0111\u01b0\u1eddng d\u00e2y, th\u1ebf l\u00e0 xong. Tuy nhi\u00ean, c\u00f9ng m\u1ed9t c\u00f4ng t\u1eafc ba c\u1ef1c n\u00e0y l\u1ea1i \u0111\u01b0\u1ee3c \u0111\u1ea5u d\u00e2y theo ba c\u00e1ch ho\u00e0n to\u00e0n kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o m\u1ea1ch m\u00e0 n\u00f3 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t: \u0111\u1ea5u tr\u1ef1c ti\u1ebfp v\u00e0o cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 ho\u1eb7c cu\u1ed9n d\u00e2y ti\u1ebfp \u0111i\u1ec3m, [\u2026]<\/p>","protected":false},"author":4,"featured_media":12351,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Limit Switch Wiring Diagram: NO, NC & Common Guide","_seopress_titles_desc":"Learn how to wire limit switches in motor, PLC, and control circuits, identify NO, NC, and common terminals, and test each connection safely.","_seopress_robots_index":"","footnotes":""},"categories":[79],"tags":[],"class_list":["post-12347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mmlblog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/comments?post=12347"}],"version-history":[{"count":1,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12347\/revisions"}],"predecessor-version":[{"id":12352,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12347\/revisions\/12352"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media\/12351"}],"wp:attachment":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media?parent=12347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/categories?post=12347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/tags?post=12347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}