S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: Lo\u1ea1i 3 d\u00e2y, 4 d\u00e2y v\u00e0 lo\u1ea1i xuy\u00ean ch\u00f9m (Gi\u1ea3i th\u00edch v\u1ec1 logic b\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng v\u00e0 b\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng)<\/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 --wire-brown: #6B4A2B;\n --wire-blue: #1F6FB2;\n --wire-black: #333333;\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-0-wires,\n.bd-post-article > .bp-1-thrub,\n.bd-post-article > .rich-table-wrap,\n.bd-post-article > .rich-callout-warning,\n.bd-post-article > .rich-checklist { margin: var(--gap-normal) 0; }\n.bd-post-article > .bp-0-wires { margin: var(--gap-attach) 0 var(--gap-normal); }\n.bd-post-article > .bp-cta-end { margin: var(--gap-section) 0 0; }\n\n\/* ---- BP-0: three-wire mnemonic card (low) ---- *\/\n.bp-0-wires { background: var(--card-bg); border: 1px solid var(--card-border); border-left: 4px solid var(--accent-deep); padding: var(--pad-compact); }\n.bp-0-title { margin: 0 0 12px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 15px; line-height: 1.4; color: var(--text-primary); }\n.bp-0-title .bp-0-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.bp-0-rows { display: flex; flex-direction: column; gap: 8px; }\n.bp-0-row { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 10px; }\n.bp-0-swatch { width: 24px; height: 24px; border-radius: 4px; display: inline-flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; line-height: 1; color: var(--btn-white); }\n.bp-0-swatch.bp-0-sw-bn { background: var(--wire-brown); }\n.bp-0-swatch.bp-0-sw-bu { background: var(--wire-blue); }\n.bp-0-swatch.bp-0-sw-bk { background: var(--wire-black); }\n.bp-0-label { font-size: 14px; line-height: 1.5; color: var(--text-primary); }\n.bp-0-label strong { font-weight: 700; }\n\n\/* ---- BP-1: through-beam two-unit signature block (high, solid inverse) ---- *\/\n.bp-1-thrub { background: var(--inverse-bg); color: var(--inverse-text); padding: var(--pad-standard); }\n.bp-1-title { margin: 0 0 14px; 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-pair { display: grid; grid-template-columns: minmax(0, 1fr) 48px minmax(0, 1fr); column-gap: 16px; align-items: stretch; }\n.bp-1-unit { min-width: 0; display: grid; grid-template-rows: 18px repeat(3, 1fr); row-gap: 6px; align-items: center; }\n.bp-1-unit-name { 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(--inv-secondary); }\n.bp-1-wire { margin: 0; font-size: 15px; line-height: 1.5; color: var(--inverse-text); display: flex; align-items: center; gap: 6px; }\n.bp-1-wire-code { font-weight: 700; }\n.bp-1-wire-arrow { display: inline-flex; flex: 0 0 auto; color: var(--inv-secondary); }\n.bp-1-wire.bp-1-out { justify-content: space-between; font-weight: 700; }\n.bp-1-wire-left { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; }\n.bp-1-out-tag { color: var(--accent); font-weight: 700; font-size: 12px; line-height: 1; letter-spacing: 0.5px; text-transform: uppercase; }\n.bp-1-note { margin: 0; font-size: 13px; line-height: 1.5; color: var(--inv-secondary); }\n.bp-1-beam { grid-column: 2; grid-row: 1; width: 48px; margin-left: -8px; align-self: center; justify-self: center; display: flex; align-items: center; justify-content: center; color: var(--accent); }\n.bp-1-divider { height: 1px; background: var(--divider-dark); border: 0; margin: 14px 0 12px; }\n.bp-1-foot { margin: 0; font-size: 13px; line-height: 1.5; color: var(--inv-secondary); }\n\n\/* ---- Rich: comparison 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-standard); }\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\/* ---- Rich: checklist cards (medium) ---- *\/\n.rich-checklist { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-standard); }\n.rich-checklist-title { margin: 0 0 12px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 17px; line-height: 1.4; color: var(--text-primary); }\n.rich-checklist-title .rich-checklist-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.rich-checklist-item { display: flex; align-items: flex-start; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--card-border); font-size: 15px; line-height: 1.6; color: var(--text-primary); }\n.rich-checklist-item:first-of-type { padding-top: 0; }\n.rich-checklist-item:last-child { border-bottom: 0; padding-bottom: 0; }\n.rich-checklist-item .rich-checklist-check { display: inline-flex; flex: 0 0 auto; color: var(--accent-deep); margin-top: 3px; }\n.rich-checklist-item p { margin: 0; }\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}\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-pair { grid-template-columns: 1fr; row-gap: 8px; }\n .bp-1-unit { display: flex; flex-direction: column; gap: 6px; }\n .bp-1-beam { grid-column: 1; grid-row: auto; width: auto; height: 36px; margin-left: 0; align-self: center; }\n .bp-1-beam svg { transform: rotate(90deg); }\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>N\u1ebfu b\u1ea1n \u0111\u00e3 t\u1eebng \u0111\u1ee9ng tr\u01b0\u1edbc m\u1ed9t chi\u1ebfc m\u00e1y c\u00f3 c\u1ea3m bi\u1ebfn quang b\u1ecb h\u1ecfng, tay c\u1ea7m m\u1ed9t chi\u1ebfc c\u1ea3m bi\u1ebfn thay th\u1ebf c\u00f3 nhi\u1ec1u d\u00e2y h\u01a1n chi\u1ebfc c\u0169, th\u00ec h\u01b0\u1edbng d\u1eabn n\u00e0y d\u00e0nh cho b\u1ea1n. Vi\u1ec7c n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n tr\u00f4ng c\u00f3 v\u1ebb ph\u1ee9c t\u1ea1p v\u00ec c\u00f9ng ba ho\u1eb7c b\u1ed1n m\u00e0u d\u00e2y l\u1ea1i \u1ea9n ch\u1ee9a nh\u1eefng h\u00e0nh vi r\u1ea5t kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o c\u1ea5u tr\u00fac c\u1ea3m bi\u1ebfn. Ch\u00fang ta s\u1ebd c\u00f9ng t\u00ecm hi\u1ec3u s\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y, t\u1eeb c\u00e1ch n\u1ed1i ba d\u00e2y \u0111\u01a1n gi\u1ea3n nh\u1ea5t cho \u0111\u1ebfn c\u00e1c c\u1eb7p c\u1ea3m bi\u1ebfn xuy\u00ean tia khi\u1ebfn ai c\u0169ng ph\u1ea3i b\u1ed1i r\u1ed1i. Ti\u1ebfp theo l\u00e0 logic \"b\u1eadt khi s\u00e1ng\/t\u1eaft khi t\u1ed1i\": ch\u00ednh n\u00f3 quy\u1ebft \u0111\u1ecbnh li\u1ec7u c\u1ea3m bi\u1ebfn c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang chi\u1ec1u hay ng\u01b0\u1ee3c chi\u1ec1u.<\/p>\n\n<h2>Ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: N\u00e2u, Xanh d\u01b0\u01a1ng, \u0110en<\/h2>\n<p>C\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n (photoeye) ph\u00e1t hi\u1ec7n v\u1eadt th\u1ec3 m\u00e0 kh\u00f4ng c\u1ea7n ti\u1ebfp x\u00fac v\u1edbi n\u00f3: m\u1ed9t b\u1ed9 ph\u00e1t chi\u1ebfu \u00e1nh s\u00e1ng, m\u1ed9t b\u1ed9 thu nh\u1eadn \u00e1nh s\u00e1ng \u0111\u00f3, v\u00e0 s\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa hai t\u00edn hi\u1ec7u n\u00e0y cho c\u1ea3m bi\u1ebfn bi\u1ebft li\u1ec7u c\u00f3 v\u1eadt th\u1ec3 n\u00e0o \u1edf \u0111\u00f3 hay kh\u00f4ng. Trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n qua c\u00e1ch k\u1ebft n\u1ed1i \u0111\u01a1n gi\u1ea3n ba d\u00e2y tr\u00ean h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb ch\u1ea1y b\u1eb1ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u (DC):<\/p>\n<ul>\n<li><strong>Brown (BN):<\/strong> ngu\u1ed3n d\u01b0\u01a1ng, k\u1ebft n\u1ed1i v\u1edbi +12\u201324 V DC<\/li>\n<li><strong>M\u00e0u xanh (BU):<\/strong> c\u1ef1c \u00e2m, n\u1ed1i v\u1edbi 0 V (c\u1ef1c chung DC)<\/li>\n<li><strong>\u0110en (BK):<\/strong> \u0111\u1ea7u ra chuy\u1ec3n m\u1ea1ch, \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c t\u1ea3i c\u1ee7a b\u1ea1n<\/li>\n<\/ul>\n\n\n<div class=\"bp-0-wires\">\n<p class=\"bp-0-title\"><span class=\"bp-0-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>T\u1ed5ng quan v\u1ec1 ba d\u00e2y d\u1eabn<\/p>\n<div class=\"bp-0-rows\">\n<div class=\"bp-0-row\"><span class=\"bp-0-swatch bp-0-sw-bn\">BN<\/span><span class=\"bp-0-label\"><strong>M\u00e0u n\u00e2u<\/strong> \u2014 Ngu\u1ed3n \u0111i\u1ec7n d\u01b0\u01a1ng, +12\u201324 V DC<\/span><\/div>\n<div class=\"bp-0-row\"><span class=\"bp-0-swatch bp-0-sw-bu\">BU<\/span><span class=\"bp-0-label\"><strong>Xanh d\u01b0\u01a1ng<\/strong> \u2014 c\u1ef1c \u00e2m ngu\u1ed3n, c\u1ef1c chung 0 V<\/span><\/div>\n<div class=\"bp-0-row\"><span class=\"bp-0-swatch bp-0-sw-bk\">BK<\/span><span class=\"bp-0-label\"><strong>M\u00e0u \u0111en<\/strong> \u2014 chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111\u1ea7u ra sang \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c t\u1ea3i<\/span><\/div>\n<\/div>\n<\/div>\n\n<p>Quy \u01b0\u1edbc m\u00e0u n\u00e0y tu\u00e2n theo ti\u00eau chu\u1ea9n IEC\/EN 60947-5-2, ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho c\u00e1c c\u1ea3m bi\u1ebfn c\u00f4ng nghi\u1ec7p d\u00f2ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u (DC) (<a href=\"https:\/\/www.pepperl-fuchs.com\/en-us\/support\/knowledge-and-literature\/knowledge-bases-for-industrial-sensors\/knowledge-base-for-inductive-sensors\/sensor-versions\/connection-methods-gp28962\">Pepperl+Fuchs, C\u01a1 s\u1edf ki\u1ebfn th\u1ee9c v\u1ec1 k\u1ebft n\u1ed1i theo ti\u00eau chu\u1ea9n EN 60947-5-2<\/a>). D\u00e2y m\u00e0u \u0111en l\u00e0 ph\u1ea7n ho\u1ea1t \u0111\u1ed9ng ch\u00ednh: \u0111\u00e2y l\u00e0 \u0111\u1ea7u ra c\u1ee7a b\u00f3ng b\u00e1n d\u1eabn, c\u00f3 ch\u1ee9c n\u0103ng ho\u1eb7c \u0111\u1ea9y ra \u0111i\u1ec7n \u00e1p +24 V (PNP, \u201csourcing\u201d) ho\u1eb7c k\u00e9o \u0111i\u1ec7n \u00e1p \u0111\u1ea7u v\u00e0o v\u1ec1 0 V (NPN, \u201csinking\u201d). B\u1ed9 nh\u1edb m\u1ed9t d\u00f2ng: <strong>PNP d\u1eabn ngu\u1ed3n t\u1eeb c\u1ef1c d\u01b0\u01a1ng, c\u00f2n NPN d\u1eabn ngu\u1ed3n v\u1ec1 c\u1ef1c \u00e2m.<\/strong> C\u1ea5p ngu\u1ed3n cho c\u1ea3m bi\u1ebfn, n\u1ed1i d\u00e2y m\u00e0u \u0111en v\u00e0o \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c cu\u1ed9n d\u00e2y r\u01a1le, v\u00e0 m\u1ea1ch \u0111i\u1ec7n s\u1ebd \u0111\u01b0\u1ee3c \u0111\u00f3ng.<\/p>\n<p>Tr\u01b0\u1edbc khi \u0111i s\u00e2u h\u01a1n, xin l\u00e0m r\u00f5 m\u1ed9t \u0111i\u1ec1u nhanh ch\u00f3ng, v\u00ec \u0111i\u1ec1u n\u00e0y khi\u1ebfn h\u1ea7u h\u1ebft m\u1ecdi ng\u01b0\u1eddi khi truy c\u1eadp trang n\u00e0y \u0111\u1ec1u c\u1ea3m th\u1ea5y b\u1ed1i r\u1ed1i: <em>c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n<\/em> \u0110\u00e8n \u0111\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng t\u1eeb ho\u00e0ng h\u00f4n \u0111\u1ebfn b\u00ecnh minh l\u1ea1i l\u00e0 m\u1ed9t c\u00e2u chuy\u1ec7n ho\u00e0n to\u00e0n kh\u00e1c. Thi\u1ebft b\u1ecb n\u00e0y c\u1ea3m bi\u1ebfn m\u1ee9c \u0111\u1ed9 \u00e1nh s\u00e1ng xung quanh \u0111\u1ec3 b\u1eadt h\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng 120\/240 V v\u00e0o ban \u0111\u00eam. N\u00f3 kh\u00f4ng c\u00f3 kh\u00e1i ni\u1ec7m v\u1ec1 \u201cv\u1eadt th\u1ec3\u201d, v\u00e0 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n c\u1ee7a n\u00f3 l\u00e0 d\u00e2y \u0111i\u1ec7n ngu\u1ed3n. B\u00e0i vi\u1ebft n\u00e0y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u1ea3m bi\u1ebfn quang \u00e1p su\u1ea5t th\u1ea5p d\u00f9ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c b\u1ed9 ph\u1eadn, g\u00f3i h\u00e0ng v\u00e0 pallet. C\u00f4ng vi\u1ec7c kh\u00e1c nhau, h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n c\u0169ng kh\u00e1c nhau.<\/p>\n\n<h2>Ba c\u1ea5u tr\u00fac c\u1ea3m bi\u1ebfn: H\u00e3y t\u00ecm hi\u1ec3u k\u1ef9 h\u1ec7 th\u1ed1ng tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh n\u1ed1i d\u00e2y<\/h2>\n<p>Tr\u01b0\u1edbc khi ch\u1ea1m v\u00e0o b\u1ea5t k\u1ef3 s\u1ee3i d\u00e2y n\u00e0o, h\u00e3y x\u00e1c \u0111\u1ecbnh r\u00f5 b\u1ea1n \u0111ang x\u1eed l\u00fd c\u1ea5u tr\u00fac quang \u0111i\u1ec7n n\u00e0o trong ba lo\u1ea1i n\u00e0y. C\u00e1ch \u0111\u1ea5u d\u00e2y c\u1ee7a ch\u00fang kh\u00e1c nhau, v\u00e0 ch\u00ednh vi\u1ec7c \u201ctr\u00f4ng ch\u00fang gi\u1ed1ng nhau\u201d l\u00e0 nguy\u00ean nh\u00e2n d\u1eabn \u0111\u1ebfn nh\u1eefng sai l\u1ea7m \u0111\u1eaft gi\u00e1.<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>C\u1ea5u tr\u00fac<\/th><th>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 nh\u1eadn bi\u1ebft \u0111i\u1ec1u \u0111\u00f3<\/th><th>Nh\u1eefng g\u00ec thi\u1ebft b\u1ecb n\u00e0y ph\u00e1t hi\u1ec7n<\/th><th>Nh\u1eefng \u0111i\u1ec3m c\u00f2n h\u1ea1n ch\u1ebf<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>C\u1ea3m bi\u1ebfn xuy\u00ean ch\u00f9m (\u0111\u1ed1i di\u1ec7n)<\/td><td>Hai \u0111\u01a1n v\u1ecb ri\u00eang bi\u1ec7t \u0111\u1ed1i di\u1ec7n nhau, kh\u00f4ng c\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1<\/td><td>V\u1eadt th\u1ec3 c\u1ea3n tr\u1edf ch\u00f9m \u00e1nh s\u00e1ng \u0111i qua gi\u1eefa ch\u00fang<\/td><td>C\u1ea7n hai thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh th\u1eb3ng h\u00e0ng, c\u1ea3 hai \u0111\u1ec1u \u0111ang \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n; kh\u00f4ng c\u00f3 l\u1ed1i t\u1eaft ch\u1ec9 d\u00f9ng m\u1ed9t \u0111\u1ea7u<\/td><\/tr>\n<tr><td>Ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c<\/td><td>M\u1ed9t \u0111\u1ea7u chi\u1ebfu v\u00e0o t\u1ea5m ph\u1ea3n x\u1ea1<\/td><td>V\u1eadt th\u1ec3 c\u1ea3n tr\u1edf ch\u00f9m tia ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i<\/td><td>C\u00e1c v\u1eadt th\u1ec3 s\u00e1ng b\u00f3ng ho\u1eb7c gi\u1ed1ng nh\u01b0 g\u01b0\u01a1ng ph\u00eda sau m\u1ee5c ti\u00eau c\u00f3 th\u1ec3 t\u1ea1o ra \u1ea3o gi\u00e1c v\u1ec1 m\u1ed9t ch\u00f9m tia r\u00f5 n\u00e9t; ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7u ch\u1ec9nh ng\u01b0\u1ee3c ph\u00e2n c\u1ef1c c\u00f3 th\u1ec3 kh\u1eafc ph\u1ee5c ph\u1ea7n l\u1edbn hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y<\/td><\/tr>\n<tr><td>Ph\u00e2n t\u00e1n (theo kho\u1ea3ng c\u00e1ch)<\/td><td>Ch\u1ec9 c\u00f3 m\u1ed9t \u0111\u1ea7u, kh\u00f4ng c\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1; ph\u00e1t hi\u1ec7n c\u00e1c v\u1eadt th\u1ec3 ph\u00eda tr\u01b0\u1edbc<\/td><td>V\u1eadt th\u1ec3 ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng tr\u1edf l\u1ea1i ch\u00ednh \u0111\u01a1n v\u1ecb \u0111\u00f3<\/td><td>T\u1ea7m ng\u1eafn; c\u00e1c v\u1eadt th\u1ec3 m\u00e0u \u0111en ho\u1eb7c trong su\u1ed1t ph\u1ea3n x\u1ea1 k\u00e9m<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>C\u00f2n c\u00f3 nh\u1eefng bi\u1ebfn th\u1ec3 \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n, bao g\u1ed3m c\u1ea3m bi\u1ebfn ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c ph\u00e2n c\u1ef1c, c\u1ea3m bi\u1ebfn khu\u1ebfch t\u00e1n lo\u1ea1i b\u1ecf n\u1ec1n, \u0111\u1ea7u c\u1ea3m bi\u1ebfn s\u1ee3i quang, c\u1ea3m bi\u1ebfn laser v\u00e0 c\u1ea3m bi\u1ebfn nh\u1eadn di\u1ec7n m\u00e0u. T\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i n\u00e0y \u0111\u1ec1u \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n t\u1eeb ba c\u1ea5u tr\u00fac tr\u00ean, v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn v\u1eabn gi\u1eef nguy\u00ean.<\/p>\n<p>C\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh lo\u1ea1i h\u1ec7 th\u1ed1ng ch\u01b0a bi\u1ebft l\u00e0 \u0111\u1eb7t ba c\u00e2u h\u1ecfi v\u00e0 tr\u1ea3 l\u1eddi ngay t\u1ea1i m\u00e1y:<\/p>\n<ol>\n<li><strong>M\u1ed9t c\u00e1i hay hai c\u00e1i?<\/strong> Hai b\u1ed9 ph\u1eadn \u0111\u1ed1i di\u1ec7n nhau c\u00f3 ngh\u0129a l\u00e0 ch\u1ebf \u0111\u1ed9 xuy\u00ean tia. L\u01b0u \u00fd r\u1eb1ng b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu l\u00e0 <em>hai m\u00e3 s\u1ea3n ph\u1ea9m ri\u00eang bi\u1ec7t<\/em>. H\u00e3y ghi c\u1ea3 hai \u0111i\u1ec1u \u0111\u00f3 l\u1ea1i.<\/li>\n<li><strong>C\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1 kh\u00f4ng?<\/strong> \u201cC\u00f3\u201d ngh\u0129a l\u00e0 ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c. \u201cKh\u00f4ng c\u00f3 b\u1ed9 ph\u1ea3n x\u1ea1\u201d v\u00e0 \u201cm\u1ed9t \u0111\u1ea7u\u201d ngh\u0129a l\u00e0 ph\u1ea3n x\u1ea1 khu\u1ebfch t\u00e1n.<\/li>\n<li><strong>M\u00e3 s\u1ea3n ph\u1ea9m \u1edf \u0111\u00e2u v\u1eady?<\/strong> Th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u1eadp tr\u00ean th\u00e2n. \u0110\u1ed1i v\u1edbi c\u1eb7p d\u1ea7m xuy\u00ean, c\u1ea3 hai n\u1eeda \u0111\u1ec1u c\u00f3 s\u1ed1 ri\u00eang v\u00e0 c\u00e1c s\u1ed1 n\u00e0y kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng tr\u00f9ng kh\u1edbp.<\/li>\n<\/ol>\n<p>H\u00e3y \u0111\u1eb7t ba c\u00e2u h\u1ecfi n\u00e0y qua \u0111i\u1ec7n tho\u1ea1i, t\u1ea1i bu\u1ed5i th\u1ea3o lu\u1eadn ho\u1eb7c t\u1ea1i k\u1ec7 ph\u1ee5 t\u00f9ng, v\u00e0 b\u1ea1n \u0111\u00e3 ng\u0103n ch\u1eb7n \u0111\u01b0\u1ee3c sai s\u00f3t ph\u1ed5 bi\u1ebfn nh\u1ea5t khi \u0111\u1eb7t h\u00e0ng trong danh m\u1ee5c n\u00e0y: mua nh\u1ea7m <em>c\u1ea5u tr\u00fac<\/em>, v\u00ed d\u1ee5 nh\u01b0 m\u1ed9t \u0111\u1ea7u chi\u1ebfu khu\u1ebfch t\u00e1n \u0111\u1ec3 thay th\u1ebf m\u1ed9t n\u1eeda c\u1ee7a c\u1eb7p c\u1ea3m bi\u1ebfn xuy\u00ean ch\u00f9m.<\/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: Video h\u01b0\u1edbng d\u1eabn n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n\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-nocookie.com\/embed\/g3utygIYy0E?rel=0\"\n title=\"H\u01b0\u1edbng d\u1eabn \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n\"\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\n <p style=\"margin:12px 0 0; font-size:14px; line-height:1.5; color:#6E6E6E;\">\n H\u00e3y xem ph\u1ea7n tr\u00ecnh di\u1ec5n th\u1ef1c t\u1ebf v\u1ec1 c\u00e1ch \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n tr\u01b0\u1edbc khi k\u1ebft n\u1ed1i t\u00edn hi\u1ec7u \u0111\u1ea7u ra v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a PLC.\n <\/p>\n<\/div>\n\n<h2>C\u1ea5u tr\u00fac m\u1ea1ch \u0111i\u1ec7n: B\u1ed9 ph\u1eadn n\u00e0o d\u1eabn t\u00edn hi\u1ec7u \u0111\u1ea7u ra?<\/h2>\n<h3>Lo\u1ea1i xuy\u00ean ch\u00f9m: b\u1ed9 ph\u00e1t ch\u1ec9 l\u00e0 ngu\u1ed3n s\u00e1ng \u2014 b\u1ed9 thu th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng \u0111i\u1ec1u khi\u1ec3n<\/h3>\n<p>\u0110\u00e2y l\u00e0 \u0111i\u1ec1u th\u1ef1c t\u1ebf gi\u00fap gi\u1ea3i quy\u1ebft h\u1ea7u h\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111\u1ea5u d\u00e2y xuy\u00ean thanh, v\u00e0 c\u0169ng l\u00e0 \u0111i\u1ec1u c\u1ea7n ghi nh\u1edb nh\u1ea5t t\u1eeb to\u00e0n b\u1ed9 b\u00e0i vi\u1ebft n\u00e0y:<\/p>\n<p><strong>Tr\u00ean c\u1ea3m bi\u1ebfn tia xuy\u00ean, t\u00edn hi\u1ec7u \u0111\u1ea7u ra lu\u00f4n \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1ea1i b\u1ed9 thu: b\u1ed9 ph\u00e1t ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t ngu\u1ed3n s\u00e1ng, v\u00e0 hai n\u1eeda c\u1ee7a c\u1ea3m bi\u1ebfn c\u00f3 m\u00e3 s\u1ea3n ph\u1ea9m kh\u00e1c nhau.<\/strong><\/p>\n\n\n<div class=\"bp-1-thrub\">\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=\"M4.9 16.1C1 12.2 1 5.8 4.9 1.9\"\/><path d=\"M7.8 4.7a6.14 6.14 0 0 0-.8 7.5\"\/><circle cx=\"12\" cy=\"9\" r=\"2\"\/><path d=\"M16.2 4.8c2 2 2.26 5.11.8 7.47\"\/><path d=\"M19.1 1.9a9.96 9.96 0 0 1 0 14.1\"\/><path d=\"M9.5 18h5\"\/><path d=\"m8 22 4-11 4 11\"\/><\/svg><\/span>Hai thi\u1ebft b\u1ecb. Ch\u1ec9 c\u00f3 m\u1ed9t thi\u1ebft b\u1ecb th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng chuy\u1ec3n m\u1ea1ch.<\/p>\n<div class=\"bp-1-pair\">\n<div class=\"bp-1-unit\">\n<p class=\"bp-1-unit-name\">B\u1ed9 ph\u00e1t<\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BN<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>+12\u201324 V DC<\/span><\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BU<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>0 V<\/span><\/p>\n<p class=\"bp-1-note\">Th\u01b0\u1eddng ch\u1ec9 c\u00f3 hai d\u00e2y<\/p>\n<\/div>\n<div class=\"bp-1-beam\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" 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><\/div>\n<div class=\"bp-1-unit\">\n<p class=\"bp-1-unit-name\">B\u1ed9 thu<\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BN<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>+12\u201324 V DC<\/span><\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BU<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>0 V<\/span><\/p>\n<p class=\"bp-1-wire bp-1-out\"><span class=\"bp-1-wire-left\"><span class=\"bp-1-wire-code\">BK<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>\u0110\u1ea7u v\u00e0o ho\u1eb7c t\u1ea3i c\u1ee7a PLC<\/span><\/span><span class=\"bp-1-out-tag\">\u0110\u1ea7u ra<\/span><\/p>\n<\/div>\n<\/div>\n<hr class=\"bp-1-divider\">\n<p class=\"bp-1-foot\">B\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu l\u00e0 hai m\u00e3 s\u1ea3n ph\u1ea9m ri\u00eang bi\u1ec7t \u2014 h\u00e3y n\u1ed1i d\u00e2y cho c\u1ea3 hai thi\u1ebft b\u1ecb v\u00e0 \u0111\u1eb7t h\u00e0ng ch\u00fang theo c\u1eb7p.<\/p>\n<\/div>\n\n<p>Tr\u01b0\u1edbc ti\u00ean, h\u00e3y n\u1ed1i d\u00e2y cho b\u1ed9 ph\u00e1t: d\u00e2y n\u00e2u n\u1ed1i v\u1edbi +V, d\u00e2y xanh d\u01b0\u01a1ng n\u1ed1i v\u1edbi 0 V. Th\u01b0\u1eddng th\u00ec ch\u1ec9 c\u00f3 v\u1eady th\u00f4i, v\u00ec nhi\u1ec1u b\u1ed9 ph\u00e1t l\u00e0 thi\u1ebft b\u1ecb hai d\u00e2y. Sau \u0111\u00f3, n\u1ed1i d\u00e2y cho b\u1ed9 thu: d\u00e2y n\u00e2u n\u1ed1i v\u1edbi +V, d\u00e2y xanh d\u01b0\u01a1ng n\u1ed1i v\u1edbi 0 V, v\u00e0 d\u00e2y \u0111en (d\u00e2y ra) n\u1ed1i v\u1edbi \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c t\u1ea3i c\u1ee7a b\u1ea1n (<a href=\"https:\/\/www.realpars.com\/blog\/photoelectric-sensor-wiring\">RealPars, c\u00e1ch \u0111\u1ea5u d\u00e2y v\u00e0 c\u00e0i \u0111\u1eb7t c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n<\/a>). N\u1ebfu b\u1ea1n c\u1ea5p ngu\u1ed3n cho b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu nh\u01b0ng kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u, c\u00e1c nguy\u00ean nh\u00e2n th\u01b0\u1eddng g\u1eb7p l\u00e0: d\u00e2y m\u00e0u \u0111en \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi b\u1ed9 ph\u00e1t (kh\u00f4ng c\u00f3 c\u00f4ng t\u1eafc n\u00e0o \u1edf \u0111\u00f3), c\u1eb7p thi\u1ebft b\u1ecb kh\u00f4ng \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh \u0111\u00fang, ho\u1eb7c lo\u1ea1i \u0111\u1ea7u ra kh\u00f4ng kh\u1edbp v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a b\u1ea1n \u2013 v\u1ea5n \u0111\u1ec1 n\u00e0y ch\u00fang ta s\u1ebd \u0111\u1ec1 c\u1eadp ngay sau \u0111\u00e2y. C\u1ea3 hai thi\u1ebft b\u1ecb \u0111\u1ec1u c\u1ea7n \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n; ch\u1ec9 c\u00f3 b\u1ed9 thu l\u00e0 c\u00f3 c\u00f4ng t\u1eafc.<\/p>\n<h3>C\u1ea3m bi\u1ebfn m\u1ed9t \u0111\u1ea7u v\u00e0 d\u00e2y th\u1ee9 t\u01b0: Ch\u1ee9c n\u0103ng c\u1ee7a d\u00e2y \u201ctr\u1eafng\u201d l\u00e0 g\u00ec<\/h3>\n<p>C\u00e1c \u0111\u1ea7u ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c v\u00e0 \u0111\u1ea7u ph\u1ea3n x\u1ea1 khu\u1ebfch t\u00e1n l\u00e0 c\u00e1c \u0111\u01a1n v\u1ecb \u0111\u1ed9c l\u1eadp, do \u0111\u00f3 ch\u00fang tu\u00e2n theo c\u1ea5u tr\u00fac ba d\u00e2y \u0111\u01a1n gi\u1ea3n nh\u01b0 \u0111\u00e3 n\u00eau \u1edf tr\u00ean. V\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p b\u1eaft \u0111\u1ea7u xu\u1ea5t hi\u1ec7n khi c\u00f3 th\u00eam d\u00e2y th\u1ee9 t\u01b0. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ba c\u00e1ch m\u00e0 c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t s\u1eed d\u1ee5ng d\u00e2y n\u00e0y, c\u00f9ng \u00fd ngh\u0129a c\u1ee7a t\u1eebng c\u00e1ch \u0111\u1ed1i v\u1edbi b\u1ea1n:<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>K\u1ebf ho\u1ea1ch<\/th><th>D\u00e2y<\/th><th>H\u00e0nh vi<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Ch\u1ebf \u0111\u1ed9 b\u1eadt tr\u00ean n\u1ec1n s\u00e1ng\/b\u1eadt tr\u00ean n\u1ec1n t\u1ed1i c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn<\/td><td>Tr\u1eafng<\/td><td>N\u1ed1i d\u00e2y m\u00e0u tr\u1eafng v\u1edbi c\u1ef1c d\u01b0\u01a1ng (+V) \u0111\u1ec3 \u0111\u00e8n s\u00e1ng; n\u1ed1i v\u1edbi 0 V \u0111\u1ec3 \u0111\u00e8n t\u1eaft<\/td><\/tr>\n<tr><td>C\u00e1c k\u1ebft qu\u1ea3 b\u1ed5 sung<\/td><td>M\u00e0u tr\u1eafng ho\u1eb7c m\u00e0u \u0111en th\u1ee9 hai<\/td><td>Hai \u0111\u1ea7u ra tr\u1ef1c ti\u1ebfp (m\u1ed9t lo\u1ea1i ho\u1ea1t \u0111\u1ed9ng khi s\u00e1ng, m\u1ed9t lo\u1ea1i ho\u1ea1t \u0111\u1ed9ng khi t\u1ed1i); h\u00e3y ch\u1ecdn lo\u1ea1i ph\u00f9 h\u1ee3p v\u1edbi m\u00e1y c\u1ee7a b\u1ea1n<\/td><\/tr>\n<tr><td>D\u1ea1y ho\u1eb7c ki\u1ec3m tra \u0111\u1ea7u v\u00e0o<\/td><td>Tr\u1eafng ho\u1eb7c x\u00e1m<\/td><td>Ch\u1ebf \u0111\u1ed9 xung \u0111\u1ec3 thi\u1ebft l\u1eadp ng\u01b0\u1ee1ng ho\u1eb7c d\u00f9ng l\u00e0m t\u00edn hi\u1ec7u ki\u1ec3m tra; \u0111\u1ec3 \u1edf ch\u1ebf \u0111\u1ed9 n\u1ed5i trong ch\u1ebf \u0111\u1ed9 ch\u1ea1y b\u00ecnh th\u01b0\u1eddng<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>C\u00f3 hai l\u01b0u \u00fd th\u1ef1c t\u1ebf \u1edf \u0111\u00e2y. Th\u1ee9 nh\u1ea5t: khi d\u00e2y ch\u1ecdn ch\u1ebf \u0111\u1ed9 s\u00e1ng\/t\u1ed1i v\u1eabn c\u00f2n <em>ch\u01b0a k\u1ebft th\u00fac<\/em>, c\u1ea3m bi\u1ebfn v\u1eabn ho\u1ea1t \u0111\u1ed9ng \u1edf ch\u1ebf \u0111\u1ed9 m\u1eb7c \u0111\u1ecbnh c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t. C\u00e1c thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh c\u00f3 th\u1ec3 kh\u00e1c nhau, v\u00ec v\u1eady \u0111\u1eebng bao gi\u1edd ch\u1ee7 quan: h\u00e3y ki\u1ec3m tra d\u00f2ng \u201cs\u01a1 \u0111\u1ed3 k\u1ebft n\u1ed1i\u201d trong b\u1ea3ng d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt, v\u00e0 n\u1ebfu s\u01a1 \u0111\u1ed3 \u0111\u00f3 kh\u00f4ng r\u00f5 r\u00e0ng (\u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng x\u1ea3y ra), h\u00e3y h\u1ecfi nh\u00e0 cung c\u1ea5p tr\u01b0\u1edbc khi \u0111\u01b0a m\u00e1y v\u00e0o v\u1eadn h\u00e0nh. Th\u1ee9 hai: m\u1ed9t s\u1ed1 c\u1ea3m bi\u1ebfn in k\u00fd hi\u1ec7u NO\/NC tr\u00ean th\u00e2n c\u1ea3m bi\u1ebfn trong khi b\u1ea3ng d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt l\u1ea1i s\u1eed d\u1ee5ng thu\u1eadt ng\u1eef \u201clight-on\u201d\/\u201cdark-on\u201d. Nh\u00e3n in n\u00e0y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn tr\u1ea1ng th\u00e1i kh\u00f4ng c\u00f3 ngu\u1ed3n \u0111i\u1ec7n v\u00e0 g\u00e2y nh\u1ea7m l\u1eabn cho nhi\u1ec1u ng\u01b0\u1eddi h\u01a1n l\u00e0 gi\u00fap \u00edch. H\u00e3y tin t\u01b0\u1edfng v\u00e0o s\u01a1 \u0111\u1ed3 k\u1ebft n\u1ed1i trong b\u1ea3ng d\u1eef li\u1ec7u, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u00e0o nh\u00e3n in tr\u00ean th\u00e2n c\u1ea3m bi\u1ebfn.<\/p>\n<p>C\u00f2n m\u1ed9t \u0111i\u1ec1u n\u1eefa c\u1ea7n l\u01b0u \u00fd khi thay th\u1ebf: c\u00e1c c\u1ea3m bi\u1ebfn ng\u1eaft k\u1ebft n\u1ed1i nhanh (M8\/M12). \u0110\u1ea7u n\u1ed1i c\u00f3 th\u1ec3 tr\u00f4ng gi\u1ed1ng h\u1ec7t nhau, nh\u01b0ng ch\u1ee9c n\u0103ng c\u1ee7a c\u00e1c ch\u00e2n c\u1eafm \u0111\u01b0\u1ee3c nh\u00e0 s\u1ea3n xu\u1ea5t ch\u1ec9 \u0111\u1ecbnh s\u1eb5n. M\u1ed9t thi\u1ebft b\u1ecb c\u00f3 c\u1ea5u h\u00ecnh \u201cch\u00e2n 4 = \u0111\u1ea7u ra\u201d s\u1ebd kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c v\u1edbi d\u00e2y c\u00e1p \u0111\u01b0\u1ee3c n\u1ed1i theo c\u1ea5u h\u00ecnh \u201cch\u00e2n 2 = \u0111\u1ea7u ra\u201d. Khi \u0111\u1eb7t h\u00e0ng c\u1ea3m bi\u1ebfn ng\u1eaft k\u1ebft n\u1ed1i nhanh, s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm ph\u1ea3i kh\u1edbp v\u1edbi d\u00e2y c\u00e1p \u0111\u00e3 c\u00f3 s\u1eb5n trong m\u00e1y.<\/p>\n\n<h2>Light-On so v\u1edbi Dark-On: \u1ee8ng d\u1ee5ng c\u1ee7a b\u1ea1n c\u1ea7n lo\u1ea1i logic \u0111\u1ea7u ra n\u00e0o?<\/h2>\n<p>B\u1ea1n \u0111\u00e3 n\u1ed1i \u0111\u00fang t\u1eebng s\u1ee3i d\u00e2y, ngu\u1ed3n \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1eadt, nh\u01b0ng c\u1ea3m bi\u1ebfn v\u1eabn ho\u1ea1t \u0111\u1ed9ng ng\u01b0\u1ee3c l\u1ea1i v\u1edbi y\u00eau c\u1ea7u c\u1ee7a m\u00e1y. Ch\u1ebf \u0111\u1ed9 \u201cb\u1eadt khi s\u00e1ng\/b\u1eadt khi t\u1ed1i\u201d l\u00e0 ch\u1ee7 \u0111\u1ec1 g\u00e2y nh\u1ea7m l\u1eabn nh\u1ea5t trong vi\u1ec7c n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n, v\u00e0 \u0111\u00e2y c\u0169ng l\u00e0 v\u1ea5n \u0111\u1ec1 m\u00e0 ngay c\u1ea3 c\u00e1c chuy\u00ean gia c\u0169ng c\u00f3 nh\u1eefng quan \u0111i\u1ec3m tr\u00e1i chi\u1ec1u.<\/p>\n<h3>\u00dd ngh\u0129a th\u1ef1c s\u1ef1 c\u1ee7a \u201clight-on\u201d v\u00e0 \u201cdark-on\u201d (v\u00e0 l\u00fd do t\u1ea1i sao \u201cNO\/NC\u201d l\u1ea1i khi\u1ebfn nhi\u1ec1u ng\u01b0\u1eddi b\u1ed1i r\u1ed1i)<\/h3>\n<p>C\u00e1c \u0111\u1ecbnh ngh\u0129a v\u1ec1 m\u1eb7t v\u1eadt l\u00fd r\u1ea5t \u0111\u01a1n gi\u1ea3n: m\u1ed9t <strong>\u0111\u00e8n s\u00e1ng<\/strong> thi\u1ebft b\u1ecb \u0111\u1ea7u ra s\u1ebd \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n khi b\u1ed9 thu nh\u1eadn \u0111\u1ee7 \u00e1nh s\u00e1ng; a <strong>dark-on<\/strong> \u0111\u1ea7u ra s\u1ebd k\u00edch ho\u1ea1t khi ch\u00f9m tia b\u1ecb che khu\u1ea5t ho\u1eb7c b\u1ed9 thu m\u1ea5t t\u00edn hi\u1ec7u (<a href=\"https:\/\/control.com\/technical-articles\/what-do-light-on-and-dark-on-mean-for-photoelectric-sensors\/\">control.com, \u00fd ngh\u0129a c\u1ee7a \u201clight-on\u201d v\u00e0 \u201cdark-on\u201d l\u00e0 g\u00ec<\/a>). V\u1ea5n \u0111\u1ec1 n\u1ea3y sinh khi ng\u01b0\u1eddi ta chuy\u1ec3n kh\u00e1i ni\u1ec7m n\u00e0y sang ng\u00f4n ng\u1eef \u201cth\u01b0\u1eddng m\u1edf\u201d\/\u201cth\u01b0\u1eddng \u0111\u00f3ng\u201d c\u1ee7a c\u00e1c c\u00f4ng t\u1eafc c\u01a1 kh\u00ed. M\u1ed9t b\u00e0i vi\u1ebft tr\u00ean blog c\u1ee7a m\u1ed9t nh\u00e0 s\u1ea3n xu\u1ea5t l\u1edbn \u0111\u00e3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi \u201cCh\u1ebf \u0111\u1ed9 \u2018\u0111\u00e8n s\u00e1ng\u2019 c\u00f3 gi\u1ed1ng v\u1edbi NO kh\u00f4ng?\u201d b\u1eb1ng c\u00e2u \u201cC\u00e2u tr\u1ea3 l\u1eddi ng\u1eafn g\u1ecdn l\u00e0 c\u00f3\u201d, sau \u0111\u00f3 \u0111\u1ecbnh ngh\u0129a ch\u1ebf \u0111\u1ed9 \u201cth\u00f4ng qua ch\u00f9m tia\u201d l\u00e0 \u201cth\u01b0\u1eddng \u0111\u00f3ng\u201d v\u00e0 ch\u1ebf \u0111\u1ed9 \u201cph\u00e2n t\u00e1n\u201d l\u00e0 \u201cth\u01b0\u1eddng m\u1edf\u201d (<a href=\"https:\/\/www.balluff.com\/en-us\/blog\/photoelectric-basics-light-on-or-dark-on\">Balluff, ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: ch\u1ebf \u0111\u1ed9 b\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng ho\u1eb7c ch\u1ebf \u0111\u1ed9 b\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng<\/a>), trong khi t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00ednh Omron \u0111\u1ecbnh ngh\u0129a ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n s\u1ef1 hi\u1ec7n di\u1ec7n khu\u1ebfch t\u00e1n \u0111i\u1ec3n h\u00ecnh l\u00e0 \u201c\u0111\u00e8n s\u00e1ng\u201d (<a href=\"https:\/\/www.ia.omron.com\/support\/guide\/43\/explanation_of_terms.html\">Omron, c\u00e1c thu\u1eadt ng\u1eef v\u1ec1 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n<\/a>). Hai ngu\u1ed3n \u0111\u00e1ng tin c\u1eady, hai b\u1ea3n d\u1ecbch kh\u00e1c nhau.<\/p>\n<p>\u0110\u00e2y l\u00e0 \u0111\u1ecbnh ngh\u0129a. NO\/NC \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a d\u1ef1a tr\u00ean m\u1ed9t <em>tr\u1ea1ng th\u00e1i ngh\u1ec9<\/em>, nh\u01b0ng tr\u1ea1ng th\u00e1i ngh\u1ec9 c\u1ee7a c\u1ea3m bi\u1ebfn quang ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea5u tr\u00fac c\u1ee7a n\u00f3. M\u1ed9t b\u1ed9 thu tia xuy\u00ean qua s\u1ebd \u1edf tr\u1ea1ng th\u00e1i s\u00e1ng khi kh\u00f4ng c\u00f3 v\u1eadt c\u1ea3n n\u00e0o trong ch\u00f9m tia; c\u00f2n \u0111\u1ea7u c\u1ea3m bi\u1ebfn khu\u1ebfch t\u00e1n s\u1ebd \u1edf tr\u1ea1ng th\u00e1i t\u1ed1i. V\u1eady n\u00ean h\u00e3y b\u1ecf qua ph\u1ea7n d\u1ecbch v\u00e0 thay v\u00e0o \u0111\u00f3 h\u00e3y \u0111\u1eb7t m\u1ed9t c\u00e2u h\u1ecfi: <strong>Khi \u0111\u1ed1i t\u01b0\u1ee3ng T\u1ed2N T\u1ea0I, k\u1ebft qu\u1ea3 \u0111\u1ea7u ra ph\u1ea3i l\u00e0 g\u00ec?<\/strong> V\u1eady th\u00ec h\u00e3y \u0111\u1ec3 c\u1ea5u tr\u00fac ch\u1ec9 cho b\u1ea1n bi\u1ebft ch\u1ebf \u0111\u1ed9 n\u00e0o s\u1ebd th\u1ef1c hi\u1ec7n \u0111i\u1ec1u \u0111\u00f3.<\/p>\n<h3>L\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean c\u1ea5u tr\u00fac: b\u00e0n l\u1eadt v\u00e0 h\u01b0\u1edbng an to\u00e0n<\/h3>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>C\u1ea5u tr\u00fac<\/th><th>Ch\u00f9m tia \u1edf tr\u1ea1ng th\u00e1i ngh\u1ec9 (kh\u00f4ng ph\u00e1t hi\u1ec7n th\u1ea5y g\u00ec)<\/th><th>C\u1ea7n b\u1eadt t\u00edn hi\u1ec7u \u0111\u1ea7u ra khi c\u00f3 v\u1eadt th\u1ec3 hi\u1ec7n di\u1ec7n<\/th><th>L\u00f4gic \u0111i\u1ec3n h\u00ecnh<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>C\u1ea3m bi\u1ebfn xuy\u00ean tia<\/td><td>\u0110\u00e8n b\u00e1o s\u00e1ng (\u0111\u00e8n tr\u00ean b\u1ed9 thu s\u00e1ng)<\/td><td>Ch\u1ebf \u0111\u1ed9 Dark-on: v\u1eadt th\u1ec3 che khu\u1ea5t ch\u00f9m tia<\/td><td>B\u1eadt ch\u1ebf \u0111\u1ed9 Dark-on \u0111\u1ec3 ph\u00e1t hi\u1ec7n kho\u1ea3ng ngh\u1ec9<\/td><\/tr>\n<tr><td>Ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c<\/td><td>C\u00f3 \u00e1nh s\u00e1ng (tia s\u00e1ng ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i t\u1eeb g\u01b0\u01a1ng ph\u1ea3n x\u1ea1)<\/td><td>Ch\u1ebf \u0111\u1ed9 Dark-on: v\u1eadt th\u1ec3 che khu\u1ea5t ch\u00f9m tia<\/td><td>B\u1eadt ch\u1ebf \u0111\u1ed9 Dark-on \u0111\u1ec3 ph\u00e1t hi\u1ec7n kho\u1ea3ng ngh\u1ec9<\/td><\/tr>\n<tr><td>Ph\u1ed5 bi\u1ebfn<\/td><td>T\u1ed1i (kh\u00f4ng ph\u1ea3n chi\u1ebfu khi \u1edf tr\u1ea1ng th\u00e1i t\u0129nh)<\/td><td>Ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng: v\u1eadt th\u1ec3 ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng tr\u1edf l\u1ea1i<\/td><td>B\u1eadt \u0111\u00e8n \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 hi\u1ec7n di\u1ec7n<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>H\u00e3y \u0111\u1ecdc k\u1ef9 b\u1ea3ng \u0111\u00f3 hai l\u1ea7n, v\u00ec \u0111\u00f3 ch\u00ednh l\u00e0 n\u01a1i \u1ea9n ch\u1ee9a nh\u1eefng sai s\u00f3t: y\u00eau c\u1ea7u \u201cb\u1eadt l\u00ean khi linh ki\u1ec7n \u0111\u1ebfn\u201d \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 <em>dark-on<\/em> tr\u00ean m\u1ed9t c\u1eb7p thanh d\u1eabn xuy\u00ean v\u00e0 <em>\u0111\u00e8n s\u00e1ng<\/em> tr\u00ean m\u1ed9t \u0111\u1ea7u ph\u00e2n t\u00e1n. N\u1ebfu s\u1eafp x\u1ebfp logic sai, t\u00edn hi\u1ec7u \u201cc\u00f3 b\u1ed9 ph\u1eadn\u201d s\u1ebd chuy\u1ec3n th\u00e0nh \u201cthi\u1ebfu b\u1ed9 ph\u1eadn\u201d. M\u00e1y s\u1ebd g\u1eb7p l\u1ed7i, c\u1ea5p li\u1ec7u qu\u00e1 m\u1ee9c ho\u1eb7c th\u1eadm ch\u00ed t\u1ec7 h\u01a1n, v\u1edbi c\u00e1c bi\u1ec3u hi\u1ec7n tr\u00f4ng gi\u1ed1ng nh\u01b0 l\u1ed7i d\u00e2y \u0111i\u1ec7n.<\/p>\n<p>N\u1ebfu b\u1ea1n \u0111\u00e3 mua m\u1ed9t c\u1ea3m bi\u1ebfn c\u00f3 \u0111\u1ea7u ra c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn ho\u1eb7c \u0111\u1ea7u ra b\u1ed5 sung, v\u1ea5n \u0111\u1ec1 n\u00e0y c\u00f3 th\u1ec3 kh\u1eafc ph\u1ee5c ngay t\u1ea1i \u0111\u1ea7u n\u1ed1i: n\u1ed1i l\u1ea1i d\u00e2y m\u00e0u tr\u1eafng, ho\u1eb7c chuy\u1ec3n d\u00e2y t\u00edn hi\u1ec7u sang \u0111\u1ea7u ra b\u1ed5 sung. Kh\u00f4ng c\u1ea7n ph\u1ea3i mua th\u00eam thi\u1ebft b\u1ecb m\u1edbi. V\u00e0 n\u1ebfu b\u1ea1n \u0111ang thay th\u1ebf m\u1ed9t c\u1ea3m bi\u1ebfn c\u0169, h\u00e3y quan s\u00e1t c\u1ea3m bi\u1ebfn c\u0169 trong su\u1ed1t m\u1ed9t chu k\u1ef3 ho\u00e0n ch\u1ec9nh v\u00e0 l\u01b0u \u00fd xem \u0111\u1ea7u ra c\u00f3 b\u1eadt khi b\u1ed9 ph\u1eadn \u0111\u00f3 c\u00f3 m\u1eb7t hay v\u1eafng m\u1eb7t. Quan s\u00e1t n\u00e0y c\u00f2n ch\u00ednh x\u00e1c h\u01a1n b\u1ea5t k\u1ef3 nh\u00e3n m\u00e1c n\u00e0o.<\/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>M\u1ed9t c\u1ea3m bi\u1ebfn quang ti\u00eau chu\u1ea9n kh\u00f4ng ph\u1ea3i l\u00e0 thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn v\u1ec1 an to\u00e0n. Tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng \u0111\u01b0\u1ee3c d\u1ef1a v\u00e0o thi\u1ebft b\u1ecb n\u00e0y, d\u00f9 \u1edf b\u1ea5t k\u1ef3 ch\u1ebf \u0111\u1ed9 k\u1ebft n\u1ed1i n\u00e0o, trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u1ea7n ph\u00e1t hi\u1ec7n tay ho\u1eb7c c\u01a1 th\u1ec3 \u0111ang d\u1eebng l\u1ea1i; \u0111\u00f3 l\u00e0 nhi\u1ec7m v\u1ee5 c\u1ee7a r\u00e8m \u00e1nh s\u00e1ng an to\u00e0n \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn. V\u00e0 khi b\u1ea1n ch\u1ecdn ch\u1ebf \u0111\u1ed9 \u201cb\u1eadt khi s\u00e1ng\u201d (light-on) ho\u1eb7c \u201cb\u1eadt khi t\u1ed1i\u201d (dark-on), h\u00e3y l\u01b0u \u00fd \u0111\u1ebfn h\u01b0\u1edbng s\u1ef1 c\u1ed1: \u1ed1ng k\u00ednh b\u1ea9n, ch\u00f9m tia y\u1ebfu d\u1ea7n ho\u1eb7c m\u1ea5t ngu\u1ed3n \u0111i\u1ec7n ph\u1ea3i khi\u1ebfn thi\u1ebft b\u1ecb chuy\u1ec3n sang tr\u1ea1ng th\u00e1i d\u1eebng\/l\u1ed7i, ch\u1ee9 kh\u00f4ng ph\u1ea3i tr\u1ea1ng th\u00e1i \u201can to\u00e0n\u201d.<\/p>\n<\/div>\n\n<h2>L\u1ef1a ch\u1ecdn \u0111\u1ea7u v\u00e0o ph\u00f9 h\u1ee3p cho PLC c\u1ee7a b\u1ea1n \u2014 v\u00e0 \u0111\u1eb7t mua linh ki\u1ec7n thay th\u1ebf ho\u1ea1t \u0111\u1ed9ng ngay t\u1eeb l\u1ea7n \u0111\u1ea7u ti\u00ean<\/h2>\n<p>C\u00e1c c\u1ea3m bi\u1ebfn quang DC \u0111\u01b0\u1ee3c \u0111\u1eb7t h\u00e0ng d\u01b0\u1edbi d\u1ea1ng PNP ho\u1eb7c NPN, v\u00e0 trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, l\u1ef1a ch\u1ecdn n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh s\u1eb5n t\u1ea1i nh\u00e0 m\u00e1y. Thi\u1ebft b\u1ecb kh\u00f4ng c\u00f3 c\u00f4ng t\u1eafc \u0111i\u1ec1u ch\u1ec9nh t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng, do \u0111\u00f3 h\u00e3y x\u00e1c nh\u1eadn lo\u1ea1i t\u00edn hi\u1ec7u \u0111\u1ea7u ra m\u00e0 thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o c\u1ee7a b\u1ea1n y\u00eau c\u1ea7u tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u00e0i ki\u1ec3m tra t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng ch\u1ec9 m\u1ea5t ba m\u01b0\u01a1i gi\u00e2y:<\/p>\n<ol>\n<li>N\u1ed1i tr\u1ef1c ti\u1ebfp \u0111\u1ea7u v\u00e0o PLC \u0111ang \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u1edbi ngu\u1ed3n +24 V. N\u1ebfu \u0111\u1ea7u v\u00e0o b\u1eadt, th\u00ec th\u1ebb \u0111ang \u1edf ch\u1ebf \u0111\u1ed9 ngu\u1ed3n ra: n\u00f3 c\u1ea7n m\u1ed9t <strong>PNP<\/strong> c\u1ea3m bi\u1ebfn.<\/li>\n<li>N\u1ebfu kh\u00f4ng, h\u00e3y n\u1ed1i \u0111\u1ea7u v\u00e0o v\u1edbi 0 V. N\u1ebfu l\u00fac n\u00e0y thi\u1ebft b\u1ecb b\u1eadt l\u00ean, th\u00ec th\u1ebb \u0111ang \u1edf ch\u1ebf \u0111\u1ed9 h\u00fat d\u00f2ng: n\u00f3 c\u1ea7n m\u1ed9t <strong>NPN<\/strong> c\u1ea3m bi\u1ebfn.<\/li>\n<\/ol>\n<p>V\u1eady th\u00ec h\u00e3y ghi nh\u1edb \u0111i\u1ec1u n\u00e0y: m\u1ed9t c\u1ea3m bi\u1ebfn NPN \u0111i\u1ec1u khi\u1ec3n \u0111\u1ea7u v\u00e0o ngu\u1ed3n \u201cc\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m cho ho\u1ea1t \u0111\u1ed9ng\u201d nh\u1edd m\u1ed9t \u0111i\u1ec7n tr\u1edf k\u00e9o l\u00ean ho\u1eb7c m\u1ed9t r\u01a1le trung gian. R\u01a1le th\u1ef1c s\u1ef1 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i, nh\u01b0ng \u0111\u00f3 ch\u1ec9 l\u00e0 gi\u1ea3i ph\u00e1p t\u1ea1m b\u1ee3 t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng v\u1edbi nh\u1eefng chi ph\u00ed th\u1ef1c t\u1ebf: th\u00eam m\u1ed9t linh ki\u1ec7n cho m\u1ed7i k\u00eanh, t\u1ed1c \u0111\u1ed9 ph\u1ea3n h\u1ed3i ch\u1eadm h\u01a1n v\u00e0 ph\u1ea3i b\u1ea3o tr\u00ec ti\u1ebfp \u0111i\u1ec3m. \u0110\u00e2y ch\u1ec9 l\u00e0 m\u1ed9t bi\u1ec7n ph\u00e1p t\u1ea1m th\u1eddi \u0111\u1ec3 h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t thi\u1ebft k\u1ebf \u0111\u00fang \u0111\u1eafn. Gi\u1ea3i ph\u00e1p tri\u1ec7t \u0111\u1ec3 l\u00e0 \u0111\u1eb7t h\u00e0ng v\u1edbi c\u1ef1c t\u00ednh ch\u00ednh x\u00e1c, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao \u0111\u01a1n \u0111\u1eb7t h\u00e0ng c\u1ee7a b\u1ea1n c\u1ea7n ph\u1ea3i c\u1ee5 th\u1ec3. Khi thay th\u1ebf m\u1ed9t c\u1ea3m bi\u1ebfn quang, h\u00e3y \u0111\u01b0a danh s\u00e1ch ki\u1ec3m tra n\u00e0y cho nh\u00e0 cung c\u1ea5p. M\u1ed7i m\u1ee5c trong danh s\u00e1ch \u0111\u1ec1u t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t th\u00f4ng s\u1ed1 m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c t\u1eeb thi\u1ebft b\u1ecb c\u0169:<\/p>\n\n<div class=\"rich-checklist\">\n<p class=\"rich-checklist-title\"><span class=\"rich-checklist-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=\"M13 5h8\"\/><path d=\"M13 12h8\"\/><path d=\"M13 19h8\"\/><path d=\"m3 17 2 2 4-4\"\/><path d=\"m3 7 2 2 4-4\"\/><\/svg><\/span>S\u00e1u th\u00f4ng tin c\u1ea7n ghi l\u1ea1i tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng c\u1ea3m bi\u1ebfn quang thay th\u1ebf<\/p>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>1. C\u1ea5u tr\u00fac c\u1ea3m bi\u1ebfn: lo\u1ea1i xuy\u00ean tia (c\u1ea3 hai m\u00e3 s\u1ea3n ph\u1ea9m: b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu), lo\u1ea1i ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c ho\u1eb7c lo\u1ea1i khu\u1ebfch t\u00e1n<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>2 Lo\u1ea1i \u0111\u1ea7u ra: PNP ho\u1eb7c NPN (ho\u1eb7c r\u01a1le \/ AC 2 d\u00e2y, \u0111\u1ed1i v\u1edbi c\u00e1c m\u00e1y c\u0169)<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>3. Logic \u0111\u1ea7u ra: b\u1eadt khi s\u00e1ng, b\u1eadt khi t\u1ed1i, c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn ho\u1eb7c b\u1ed5 sung<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>4 Ngu\u1ed3n c\u1ea5p v\u00e0 s\u1ed1 d\u00e2y: 12\u201324 V DC; 3 d\u00e2y ho\u1eb7c 4 d\u00e2y; chi\u1ec1u d\u00e0i d\u00e2y d\u1eabn ho\u1eb7c s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm M8\/M12<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>5. Ph\u1ea1m vi ph\u00e1t hi\u1ec7n v\u00e0 c\u00e1ch l\u1eafp \u0111\u1eb7t: ki\u1ec3m tra gi\u00e1 \u0111\u1ee1 c\u0169 v\u00e0 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u0169<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>6. M\u00f4i tr\u01b0\u1eddng: c\u00f3 th\u1ec3 phun n\u01b0\u1edbc, c\u00f3 b\u1ee5i ho\u1eb7c ngo\u00e0i tr\u1eddi; \u0111\u1ea1t ho\u1eb7c v\u01b0\u1ee3t m\u1ee9c x\u1ebfp h\u1ea1ng IP c\u0169<\/p><\/div>\n<\/div>\n\n<p>N\u1ebfu nh\u00e3n tr\u00ean thi\u1ebft b\u1ecb c\u0169 \u0111\u00e3 b\u1ecb m\u00f2n ho\u1eb7c bong tr\u00f3c, h\u00e3y th\u1ef1c hi\u1ec7n danh s\u00e1ch ki\u1ec3m tra theo tr\u00ecnh t\u1ef1 ng\u01b0\u1ee3c l\u1ea1i c\u00f9ng v\u1edbi nh\u00e0 cung c\u1ea5p \u2013 ng\u01b0\u1eddi c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean b\u1ed1i c\u1ea3nh c\u1ee7a m\u00e1y (c\u00e1ch l\u1eafp \u0111\u1eb7t, ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng) thay v\u00ec ph\u1ecfng \u0111o\u00e1n d\u1ef1a tr\u00ean h\u00ecnh \u1ea3nh.<\/p>\n\n<h2>D\u00e2y \u0111i\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u00fang c\u00e1ch nh\u01b0ng c\u1ea3m bi\u1ebfn v\u1eabn kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng? \u0110\u1eb7t l\u1ecbch ch\u1ea9n \u0111o\u00e1n t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/h2>\n<p>Khi m\u1ed9t c\u1ea3m bi\u1ebfn quang v\u1eeba \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t g\u1eb7p s\u1ef1 c\u1ed1, h\u00e3y ti\u1ebfn h\u00e0nh ch\u1ea9n \u0111o\u00e1n theo th\u1ee9 t\u1ef1 sau \u0111\u00e2y. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m h\u00e0ng gi\u1edd \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 t\u00ecm ki\u1ebfm nguy\u00ean nh\u00e2n m\u01a1 h\u1ed3:<\/p>\n\n<div class=\"rich-checklist\">\n<p class=\"rich-checklist-title\"><span class=\"rich-checklist-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=\"M13 5h8\"\/><path d=\"M13 12h8\"\/><path d=\"M13 19h8\"\/><path d=\"m3 17 2 2 4-4\"\/><path d=\"m3 7 2 2 4-4\"\/><\/svg><\/span>Ch\u1ea9n \u0111o\u00e1n ba b\u01b0\u1edbc: ki\u1ec3m tra theo th\u1ee9 t\u1ef1 sau \u0111\u00e2y<\/p>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>1. L\u1edbp d\u00e2y d\u1eabn: c\u1ef1c t\u00ednh b\u1ecb \u0111\u1ea3o ng\u01b0\u1ee3c (d\u00e2y n\u00e2u v\u00e0 xanh d\u01b0\u01a1ng b\u1ecb ho\u00e1n \u0111\u1ed5i), d\u00e2y \u0111en n\u1ed1i v\u1edbi c\u1ef1c ph\u00e1t, d\u00e2y tr\u1eafng c\u1ee7a c\u00f4ng t\u1eafc ch\u1ecdn b\u00ean tr\u00e1i kh\u00f4ng \u0111\u01b0\u1ee3c n\u1ed1i, s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm QD sai, ho\u1eb7c d\u00f2ng t\u1ea3i v\u01b0\u1ee3t qu\u00e1 c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c \u0111\u1ea7u ra; h\u00e3y \u0111\u1ed1i chi\u1ebfu v\u1edbi s\u01a1 \u0111\u1ed3 trong b\u1ea3ng d\u1eef li\u1ec7u tr\u01b0\u1edbc m\u1eb7t b\u1ea1n<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>2. L\u1edbp logic: ch\u1ebf \u0111\u1ed9 \u201cs\u00e1ng khi c\u00f3 t\u00edn hi\u1ec7u\u201d ho\u1eb7c \u201ct\u1ed1i khi c\u00f3 t\u00edn hi\u1ec7u\u201d \u0111\u01b0\u1ee3c ch\u1ecdn ng\u01b0\u1ee3c l\u1ea1i so v\u1edbi c\u1ea5u tr\u00fac (xem b\u1ea3ng \u0111\u1ea3o ng\u01b0\u1ee3c \u1edf tr\u00ean), ho\u1eb7c ch\u01b0\u01a1ng tr\u00ecnh PLC ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u0111\u1ecdc t\u00edn hi\u1ec7u theo d\u1ea1ng \u0111\u1ea3o ng\u01b0\u1ee3c; h\u00e3y quan s\u00e1t \u0111\u00e8n LED c\u1ee7a ch\u00ednh c\u1ea3m bi\u1ebfn khi m\u1ed9t chi ti\u1ebft \u0111i qua \u0111\u1ec3 ph\u00e2n bi\u1ec7t logic c\u1ee7a c\u1ea3m bi\u1ebfn v\u1edbi logic c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>3. L\u1edbp v\u1eadt l\u00fd: ch\u00f9m tia b\u1ecb l\u1ec7ch h\u01b0\u1edbng, th\u1ea5u k\u00ednh b\u1ecb b\u00e1m b\u1ee5i, s\u01b0\u01a1ng d\u1ea7u, h\u01a1i n\u01b0\u1edbc ng\u01b0ng t\u1ee5 ho\u1eb7c m\u00e0ng x\u00e0 ph\u00f2ng (nguy\u00ean nh\u00e2n h\u00e0ng \u0111\u1ea7u d\u1eabn \u0111\u1ebfn suy gi\u1ea3m kh\u1ea3 n\u0103ng c\u1ea3m bi\u1ebfn quang h\u1ecdc), \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi ho\u1eb7c \u00e1nh s\u00e1ng m\u00f4i tr\u01b0\u1eddng m\u1ea1nh chi\u1ebfu v\u00e0o b\u1ed9 thu t\u1ea7m xa, ho\u1eb7c n\u1ec1n s\u00e1ng b\u00f3ng ph\u1ea3n x\u1ea1 xung quanh m\u1ee5c ti\u00eau m\u1edd; h\u00e3y l\u00e0m s\u1ea1ch th\u1ea5u k\u00ednh, \u0111i\u1ec1u ch\u1ec9nh l\u1ea1i h\u01b0\u1edbng c\u1ee7a c\u1eb7p thi\u1ebft b\u1ecb v\u00e0 ki\u1ec3m tra trong c\u1ea3 hai \u0111i\u1ec1u ki\u1ec7n \u00e1nh s\u00e1ng<\/p><\/div>\n<\/div>\n\n<p>V\u1eabn kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng sau khi th\u1eed c\u1ea3 ba c\u00e1ch? H\u00e3y \u0111o \u0111i\u1ec7n \u00e1p tr\u00ean d\u00e2y \u0111\u1ea7u ra so v\u1edbi 0 V trong khi b\u1ea1n ch\u1eb7n ch\u00f9m tia: n\u1ebfu \u0111i\u1ec7n \u00e1p kh\u00f4ng thay \u0111\u1ed5i, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf c\u1ea3m bi\u1ebfn ho\u1eb7c ngu\u1ed3n c\u1ea5p c\u1ee7a n\u00f3; n\u1ebfu \u0111i\u1ec7n \u00e1p thay \u0111\u1ed5i nh\u01b0ng PLC kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf \u0111o\u1ea1n d\u00e2y gi\u1eefa \u0111\u1ea7u ra v\u00e0 \u0111\u1ea7u v\u00e0o. S\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y s\u1ebd gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111o\u1ea1n d\u00e2y n\u00e0o c\u00f3 v\u1ea5n \u0111\u1ec1.<\/p>\n\n<h2>Nhu c\u1ea7u thay th\u1ebf c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i v\u00e0 nh\u00e0 b\u00e1n bu\u00f4n<\/h2>\n<p>T\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec1u n\u00eau tr\u00ean \u2013 vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac, quy t\u1eafc ti\u1ebfp nh\u1eadn, b\u1ea3ng chuy\u1ec3n \u0111\u1ed5i \u2013 ch\u00ednh l\u00e0 y\u1ebfu t\u1ed1 ph\u00e2n bi\u1ec7t gi\u1eefa m\u1ed9t nh\u00e0 ph\u00e2n ph\u1ed1i ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c c\u00e1c cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1i v\u00e0 m\u1ed9t nh\u00e0 ph\u00e2n ph\u1ed1i nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u01a1n \u0111\u1eb7t h\u00e0ng. Kh\u00e1ch h\u00e0ng c\u1ee7a b\u1ea1n m\u00f4 t\u1ea3 c\u1ea3m bi\u1ebfn quang theo c\u00e1ch h\u1ecd nh\u00ecn th\u1ea5y: \u201clo\u1ea1i c\u00f3 hai \u0111\u1ea7u\u201d, \u201clo\u1ea1i c\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1\u201d, \u201clo\u1ea1i m\u1ed9t \u0111\u1ea7u c\u00f3 th\u1ec3 nh\u1eadn di\u1ec7n chai\u201d. Nh\u1eefng m\u00f4 t\u1ea3 n\u00e0y t\u01b0\u01a1ng \u1ee9ng m\u1ed9t-m\u1ed9t v\u1edbi ba c\u1ea5u tr\u00fac trong h\u01b0\u1edbng d\u1eabn n\u00e0y. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao ba c\u00e2u h\u1ecfi nh\u1eadn di\u1ec7n n\u00e0y c\u0169ng \u0111\u00f3ng vai tr\u00f2 nh\u01b0 k\u1ecbch b\u1ea3n ch\u0103m s\u00f3c kh\u00e1ch h\u00e0ng, v\u00e0 t\u1ea1i sao nh\u00e0 ph\u00e2n ph\u1ed1i c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi ch\u00fang trong m\u1ed9t cu\u1ed9c g\u1ecdi s\u1ebd gi\u00e0nh \u0111\u01b0\u1ee3c \u0111\u01a1n h\u00e0ng l\u1eb7p l\u1ea1i.<\/p>\n<p>C\u1ea5u tr\u00fac ti\u00eau chu\u1ea9n n\u00e0y gi\u00fap t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho v\u00e0 l\u1eadp b\u00e1o gi\u00e1. H\u00e3y qu\u1ea3n l\u00fd c\u00e1c c\u1eb7p c\u1ea3m bi\u1ebfn quang xuy\u00ean qua theo t\u1eebng c\u1eb7p, v\u00ec b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu th\u01b0\u1eddng h\u1ecfng h\u00f3c v\u00e0 \u0111\u01b0\u1ee3c thay th\u1ebf c\u00f9ng nhau. N\u00ean \u01b0u ti\u00ean s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb c\u00f3 logic c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn ho\u1eb7c logic b\u1ed5 sung khi ph\u00f9 h\u1ee3p: m\u1ed9t m\u00e3 SKU duy nh\u1ea5t c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng c\u1ea3 nhu c\u1ea7u \u201cb\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng\u201d v\u00e0 \u201cb\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng\u201d. L\u1eadp b\u00e1o gi\u00e1 cho m\u1ecdi \u0111\u01a1n h\u00e0ng b\u1eb1ng danh s\u00e1ch ki\u1ec3m tra s\u00e1u tr\u01b0\u1eddng: c\u1ea5u tr\u00fac, c\u1ef1c t\u00ednh, logic, ngu\u1ed3n c\u1ea5p\/d\u00e2y d\u1eabn, ph\u1ea1m vi, m\u00f4i tr\u01b0\u1eddng. \u0110\u1ed1i v\u1edbi c\u1ea3m bi\u1ebfn quang, c\u1ef1c t\u00ednh sai ho\u1eb7c logic b\u1ecb \u0111\u1ea3o ng\u01b0\u1ee3c s\u1ebd d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng \u201c\u0111\u00e3 nh\u1eadn h\u00e0ng nh\u01b0ng kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng\u201d v\u00e0 ph\u1ea3i tr\u1ea3 l\u1ea1i h\u00e0ng, v\u00e0 vi\u1ec7c tr\u1ea3 l\u1ea1i h\u00e0ng ch\u00ednh l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m gi\u1ea3m l\u1ee3i nhu\u1eadn. Kh\u00f4ng c\u00f3 g\u00ec l\u00e0 qu\u00e1 ph\u1ee9c t\u1ea1p c\u1ea3: \u0111\u00f3 ch\u00ednh l\u00e0 s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y m\u00e0 b\u1ea1n \u0111\u00e3 bi\u1ebft, \u0111\u01b0\u1ee3c di\u1ec5n gi\u1ea3i l\u1ea1i th\u00e0nh ch\u00ednh s\u00e1ch qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho.<\/p>\n<p><em>N\u1ebfu qu\u00fd kh\u00e1ch \u0111ang thay th\u1ebf c\u00e1c c\u1ea3m bi\u1ebfn quang v\u00e0 mu\u1ed1n ki\u1ec3m tra th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt tr\u01b0\u1edbc khi quy\u1ebft \u0111\u1ecbnh, d\u00f9 l\u00e0 v\u1ec1 c\u1ea5u tr\u00fac, lo\u1ea1i t\u00edn hi\u1ec7u \u0111\u1ea7u ra, ch\u1ebf \u0111\u1ed9 k\u00edch ho\u1ea1t khi s\u00e1ng\/t\u1ed1i hay s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm, h\u00e3y g\u1eedi th\u00f4ng tin chi ti\u1ebft c\u1ee7a thi\u1ebft b\u1ecb c\u0169 \u0111\u1ebfn \u0111\u1ed9i ng\u0169 l\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m c\u1ee7a OMCH. Ch\u00fang t\u00f4i s\u1ebd \u0111\u1ed1i chi\u1ebfu v\u1edbi c\u00e1c b\u1ea3n v\u1ebd v\u00e0 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt trong danh m\u1ee5c t\u1ef1 \u0111\u1ed9ng h\u00f3a v\u1edbi h\u01a1n 30 danh m\u1ee5c s\u1ea3n ph\u1ea9m c\u1ee7a ch\u00fang t\u00f4i, \u0111\u1ed3ng th\u1eddi s\u1ebd x\u00e1c nh\u1eadn m\u1eabu th\u1eed tr\u00ean m\u00e1y c\u1ee7a qu\u00fd kh\u00e1ch tr\u01b0\u1edbc khi qu\u00fd kh\u00e1ch \u0111\u1eb7t h\u00e0ng s\u1ed1 l\u01b0\u1ee3ng l\u1edbn.<\/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=\"M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z\"\/><polyline points=\"22,6 12,13 2,6\"\/><\/svg><\/span>Bi\u1ebfn c\u00e1c cu\u1ed9c g\u1ecdi y\u00eau c\u1ea7u thay th\u1ebf th\u00e0nh \u0111\u01a1n h\u00e0ng \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn<\/p>\n<p class=\"bp-cta-end-sub\">H\u00e3y g\u1eedi th\u00f4ng tin v\u1ec1 c\u1ea5u tr\u00fac, lo\u1ea1i \u0111\u1ea7u ra v\u00e0 logic \u201cs\u00e1ng khi b\u1eadt\/t\u1ed1i khi b\u1eadt\u201d m\u00e0 qu\u00fd kh\u00e1ch \u0111\u00e3 ghi nh\u1eadn t\u1eeb m\u00e1y \u2014 ho\u1eb7c h\u00ecnh \u1ea3nh v\u00e0 c\u00e1c d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft tr\u00ean thi\u1ebft b\u1ecb c\u0169 \u2014 \u0111\u1ec3 c\u00e1c k\u1ef9 s\u01b0 l\u1ef1a ch\u1ecdn c\u1ee7a ch\u00fang t\u00f4i ki\u1ec3m tra t\u00ednh t\u01b0\u01a1ng th\u00edch 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 \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra theo th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/a>\n<\/div>\n\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol class=\"bd-refs\">\n<li><a href=\"https:\/\/www.pepperl-fuchs.com\/en-us\/support\/knowledge-and-literature\/knowledge-bases-for-industrial-sensors\/knowledge-base-for-inductive-sensors\/sensor-versions\/connection-methods-gp28962\">Pepperl+Fuchs. \u201cC\u1ea3m bi\u1ebfn c\u1ea3m \u1ee9ng \u2013 K\u1ebft n\u1ed1i \u0111i\u1ec7n: M\u00e0u d\u00e2y v\u00e0 c\u00e1ch b\u1ed1 tr\u00ed ch\u00e2n c\u1eafm theo ti\u00eau chu\u1ea9n EN 60947-5-2.\u201d<\/a><\/li>\n<li><a href=\"https:\/\/www.ia.omron.com\/support\/guide\/43\/explanation_of_terms.html\">Omron Industrial Automation. \u201cC\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n \u2013 Gi\u1ea3i th\u00edch c\u00e1c thu\u1eadt ng\u1eef (Light-ON \/ Dark-ON).\u201d<\/a><\/li>\n<li><a href=\"https:\/\/www.balluff.com\/en-us\/blog\/photoelectric-basics-light-on-or-dark-on\">Balluff. \u201cKi\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n \u2013 Light-On ho\u1eb7c Dark-On.\u201d Th\u00e1ng 6 n\u0103m 2024.<\/a><\/li>\n<li><a href=\"https:\/\/www.realpars.com\/blog\/photoelectric-sensor-wiring\">RealPars. \u201cC\u00e1ch n\u1ed1i d\u00e2y, c\u00e0i \u0111\u1eb7t v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 cho c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n.\u201d<\/a><\/li>\n<li><a href=\"https:\/\/control.com\/technical-articles\/what-do-light-on-and-dark-on-mean-for-photoelectric-sensors\/\">control.com. \u201cLight-On v\u00e0 Dark-On c\u00f3 \u00fd ngh\u0129a g\u00ec \u0111\u1ed1i v\u1edbi c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n?\u201d Th\u00e1ng 1 n\u0103m 2025.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/sensor-switches\/\">C\u00f4ng t\u1eafc c\u1ea3m bi\u1ebfn OMCH \u2013 D\u00f2ng s\u1ea3n ph\u1ea9m c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n v\u00e0 c\u1ea3m bi\u1ebfn ti\u1ec7m c\u1eadn<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/product-selection\/\">L\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m OMCH \u2013 Ph\u1ed1i h\u1ee3p d\u1ef1a tr\u00ean th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 b\u1ea3n v\u1ebd<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/contact\/\">Li\u00ean h\u1ec7 v\u1edbi OMCH<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/\">OMCH \u2013 Linh ki\u1ec7n t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p<\/a><\/li>\n<\/ol>\n<\/article>\n<\/div>\n\n<\/body><\/html>","protected":false},"excerpt":{"rendered":"<p>S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: Lo\u1ea1i 3 d\u00e2y, 4 d\u00e2y v\u00e0 lo\u1ea1i xuy\u00ean ch\u00f9m (Gi\u1ea3i th\u00edch v\u1ec1 ch\u1ebf \u0111\u1ed9 b\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng v\u00e0 b\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng) N\u1ebfu b\u1ea1n t\u1eebng \u0111\u1ee9ng tr\u01b0\u1edbc m\u1ed9t m\u00e1y m\u00f3c c\u00f3 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n h\u1ecfng, c\u1ea7m tr\u00ean tay m\u1ed9t c\u1ea3m bi\u1ebfn thay th\u1ebf c\u00f3 nhi\u1ec1u d\u00e2y h\u01a1n c\u1ea3m bi\u1ebfn c\u0169, th\u00ec h\u01b0\u1edbng d\u1eabn n\u00e0y d\u00e0nh cho b\u1ea1n. S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n tr\u00f4ng c\u00f3 v\u1ebb ph\u1ee9c t\u1ea1p v\u00ec c\u00f9ng ba ho\u1eb7c b\u1ed1n m\u00e0u d\u00e2y [\u2026]<\/p>","protected":false},"author":4,"featured_media":12215,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Photoelectric Sensor Wiring Diagram: PNP, NPN & More","_seopress_titles_desc":"Learn how to wire 3-wire, 4-wire and through-beam photoelectric sensors, match PNP\/NPN outputs and choose light-on or dark-on logic.","_seopress_robots_index":"","footnotes":""},"categories":[79],"tags":[],"class_list":["post-12220","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\/12220","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=12220"}],"version-history":[{"count":1,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12220\/revisions"}],"predecessor-version":[{"id":12223,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12220\/revisions\/12223"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media\/12215"}],"wp:attachment":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media?parent=12220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/categories?post=12220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/tags?post=12220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":12220,"date":"2026-09-09T06:05:24","date_gmt":"2026-09-09T06:05:24","guid":{"rendered":"https:\/\/www.omch.com\/?p=12220"},"modified":"2026-09-09T06:05:26","modified_gmt":"2026-09-09T06:05:26","slug":"photoelectric-sensor-wiring-diagram","status":"publish","type":"post","link":"https:\/\/www.omch.com\/vi\/photoelectric-sensor-wiring-diagram\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: C\u1ea3m bi\u1ebfn 3 d\u00e2y, 4 d\u00e2y v\u00e0 c\u1ea3m bi\u1ebfn xuy\u00ean ch\u00f9m"},"content":{"rendered":"\n\n\n\nS\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: Lo\u1ea1i 3 d\u00e2y, 4 d\u00e2y v\u00e0 lo\u1ea1i xuy\u00ean ch\u00f9m (Gi\u1ea3i th\u00edch v\u1ec1 logic b\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng v\u00e0 b\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng)<\/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 --wire-brown: #6B4A2B;\n --wire-blue: #1F6FB2;\n --wire-black: #333333;\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; 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text-decoration-color: currentColor; }\n\n\/* ---- block outer margins: direct children, specific classes ---- *\/\n.bd-post-article > .bp-0-wires,\n.bd-post-article > .bp-1-thrub,\n.bd-post-article > .rich-table-wrap,\n.bd-post-article > .rich-callout-warning,\n.bd-post-article > .rich-checklist { margin: var(--gap-normal) 0; }\n.bd-post-article > .bp-0-wires { margin: var(--gap-attach) 0 var(--gap-normal); }\n.bd-post-article > .bp-cta-end { margin: var(--gap-section) 0 0; }\n\n\/* ---- BP-0: three-wire mnemonic card (low) ---- *\/\n.bp-0-wires { background: var(--card-bg); border: 1px solid var(--card-border); border-left: 4px solid var(--accent-deep); padding: var(--pad-compact); }\n.bp-0-title { margin: 0 0 12px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 15px; line-height: 1.4; color: var(--text-primary); }\n.bp-0-title .bp-0-title-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.bp-0-rows { display: flex; flex-direction: column; gap: 8px; }\n.bp-0-row { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 10px; }\n.bp-0-swatch { width: 24px; height: 24px; border-radius: 4px; display: inline-flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; line-height: 1; color: var(--btn-white); }\n.bp-0-swatch.bp-0-sw-bn { background: var(--wire-brown); }\n.bp-0-swatch.bp-0-sw-bu { background: var(--wire-blue); }\n.bp-0-swatch.bp-0-sw-bk { background: var(--wire-black); }\n.bp-0-label { font-size: 14px; line-height: 1.5; color: var(--text-primary); }\n.bp-0-label strong { font-weight: 700; }\n\n\/* ---- BP-1: through-beam two-unit signature block (high, solid inverse) ---- *\/\n.bp-1-thrub { background: var(--inverse-bg); color: var(--inverse-text); padding: var(--pad-standard); }\n.bp-1-title { margin: 0 0 14px; 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; 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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-standard); }\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\/* ---- Rich: checklist cards (medium) ---- *\/\n.rich-checklist { background: var(--card-bg); border: 1px solid var(--card-border); padding: var(--pad-standard); }\n.rich-checklist-title { margin: 0 0 12px; font-family: \"Roboto\", sans-serif; font-weight: 700; font-size: 17px; line-height: 1.4; color: var(--text-primary); }\n.rich-checklist-title .rich-checklist-icon { display: inline-flex; vertical-align: -0.2em; margin-right: 8px; color: var(--accent-deep); }\n.rich-checklist-item { display: flex; align-items: flex-start; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--card-border); font-size: 15px; line-height: 1.6; color: var(--text-primary); }\n.rich-checklist-item:first-of-type { padding-top: 0; }\n.rich-checklist-item:last-child { border-bottom: 0; padding-bottom: 0; }\n.rich-checklist-item .rich-checklist-check { display: inline-flex; flex: 0 0 auto; color: var(--accent-deep); margin-top: 3px; }\n.rich-checklist-item p { margin: 0; }\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}\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-pair { grid-template-columns: 1fr; row-gap: 8px; }\n .bp-1-unit { display: flex; flex-direction: column; gap: 6px; }\n .bp-1-beam { grid-column: 1; grid-row: auto; width: auto; height: 36px; margin-left: 0; align-self: center; }\n .bp-1-beam svg { transform: rotate(90deg); }\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>N\u1ebfu b\u1ea1n \u0111\u00e3 t\u1eebng \u0111\u1ee9ng tr\u01b0\u1edbc m\u1ed9t chi\u1ebfc m\u00e1y c\u00f3 c\u1ea3m bi\u1ebfn quang b\u1ecb h\u1ecfng, tay c\u1ea7m m\u1ed9t chi\u1ebfc c\u1ea3m bi\u1ebfn thay th\u1ebf c\u00f3 nhi\u1ec1u d\u00e2y h\u01a1n chi\u1ebfc c\u0169, th\u00ec h\u01b0\u1edbng d\u1eabn n\u00e0y d\u00e0nh cho b\u1ea1n. Vi\u1ec7c n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n tr\u00f4ng c\u00f3 v\u1ebb ph\u1ee9c t\u1ea1p v\u00ec c\u00f9ng ba ho\u1eb7c b\u1ed1n m\u00e0u d\u00e2y l\u1ea1i \u1ea9n ch\u1ee9a nh\u1eefng h\u00e0nh vi r\u1ea5t kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o c\u1ea5u tr\u00fac c\u1ea3m bi\u1ebfn. Ch\u00fang ta s\u1ebd c\u00f9ng t\u00ecm hi\u1ec3u s\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y, t\u1eeb c\u00e1ch n\u1ed1i ba d\u00e2y \u0111\u01a1n gi\u1ea3n nh\u1ea5t cho \u0111\u1ebfn c\u00e1c c\u1eb7p c\u1ea3m bi\u1ebfn xuy\u00ean tia khi\u1ebfn ai c\u0169ng ph\u1ea3i b\u1ed1i r\u1ed1i. Ti\u1ebfp theo l\u00e0 logic \"b\u1eadt khi s\u00e1ng\/t\u1eaft khi t\u1ed1i\": ch\u00ednh n\u00f3 quy\u1ebft \u0111\u1ecbnh li\u1ec7u c\u1ea3m bi\u1ebfn c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang chi\u1ec1u hay ng\u01b0\u1ee3c chi\u1ec1u.<\/p>\n\n<h2>Ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: N\u00e2u, Xanh d\u01b0\u01a1ng, \u0110en<\/h2>\n<p>C\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n (photoeye) ph\u00e1t hi\u1ec7n v\u1eadt th\u1ec3 m\u00e0 kh\u00f4ng c\u1ea7n ti\u1ebfp x\u00fac v\u1edbi n\u00f3: m\u1ed9t b\u1ed9 ph\u00e1t chi\u1ebfu \u00e1nh s\u00e1ng, m\u1ed9t b\u1ed9 thu nh\u1eadn \u00e1nh s\u00e1ng \u0111\u00f3, v\u00e0 s\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa hai t\u00edn hi\u1ec7u n\u00e0y cho c\u1ea3m bi\u1ebfn bi\u1ebft li\u1ec7u c\u00f3 v\u1eadt th\u1ec3 n\u00e0o \u1edf \u0111\u00f3 hay kh\u00f4ng. Trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n qua c\u00e1ch k\u1ebft n\u1ed1i \u0111\u01a1n gi\u1ea3n ba d\u00e2y tr\u00ean h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb ch\u1ea1y b\u1eb1ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u (DC):<\/p>\n<ul>\n<li><strong>Brown (BN):<\/strong> ngu\u1ed3n d\u01b0\u01a1ng, k\u1ebft n\u1ed1i v\u1edbi +12\u201324 V DC<\/li>\n<li><strong>M\u00e0u xanh (BU):<\/strong> c\u1ef1c \u00e2m, n\u1ed1i v\u1edbi 0 V (c\u1ef1c chung DC)<\/li>\n<li><strong>\u0110en (BK):<\/strong> \u0111\u1ea7u ra chuy\u1ec3n m\u1ea1ch, \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c t\u1ea3i c\u1ee7a b\u1ea1n<\/li>\n<\/ul>\n\n\n<div class=\"bp-0-wires\">\n<p class=\"bp-0-title\"><span class=\"bp-0-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>T\u1ed5ng quan v\u1ec1 ba d\u00e2y d\u1eabn<\/p>\n<div class=\"bp-0-rows\">\n<div class=\"bp-0-row\"><span class=\"bp-0-swatch bp-0-sw-bn\">BN<\/span><span class=\"bp-0-label\"><strong>M\u00e0u n\u00e2u<\/strong> \u2014 Ngu\u1ed3n \u0111i\u1ec7n d\u01b0\u01a1ng, +12\u201324 V DC<\/span><\/div>\n<div class=\"bp-0-row\"><span class=\"bp-0-swatch bp-0-sw-bu\">BU<\/span><span class=\"bp-0-label\"><strong>Xanh d\u01b0\u01a1ng<\/strong> \u2014 c\u1ef1c \u00e2m ngu\u1ed3n, c\u1ef1c chung 0 V<\/span><\/div>\n<div class=\"bp-0-row\"><span class=\"bp-0-swatch bp-0-sw-bk\">BK<\/span><span class=\"bp-0-label\"><strong>M\u00e0u \u0111en<\/strong> \u2014 chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111\u1ea7u ra sang \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c t\u1ea3i<\/span><\/div>\n<\/div>\n<\/div>\n\n<p>Quy \u01b0\u1edbc m\u00e0u n\u00e0y tu\u00e2n theo ti\u00eau chu\u1ea9n IEC\/EN 60947-5-2, ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho c\u00e1c c\u1ea3m bi\u1ebfn c\u00f4ng nghi\u1ec7p d\u00f2ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u (DC) (<a href=\"https:\/\/www.pepperl-fuchs.com\/en-us\/support\/knowledge-and-literature\/knowledge-bases-for-industrial-sensors\/knowledge-base-for-inductive-sensors\/sensor-versions\/connection-methods-gp28962\">Pepperl+Fuchs, C\u01a1 s\u1edf ki\u1ebfn th\u1ee9c v\u1ec1 k\u1ebft n\u1ed1i theo ti\u00eau chu\u1ea9n EN 60947-5-2<\/a>). D\u00e2y m\u00e0u \u0111en l\u00e0 ph\u1ea7n ho\u1ea1t \u0111\u1ed9ng ch\u00ednh: \u0111\u00e2y l\u00e0 \u0111\u1ea7u ra c\u1ee7a b\u00f3ng b\u00e1n d\u1eabn, c\u00f3 ch\u1ee9c n\u0103ng ho\u1eb7c \u0111\u1ea9y ra \u0111i\u1ec7n \u00e1p +24 V (PNP, \u201csourcing\u201d) ho\u1eb7c k\u00e9o \u0111i\u1ec7n \u00e1p \u0111\u1ea7u v\u00e0o v\u1ec1 0 V (NPN, \u201csinking\u201d). B\u1ed9 nh\u1edb m\u1ed9t d\u00f2ng: <strong>PNP d\u1eabn ngu\u1ed3n t\u1eeb c\u1ef1c d\u01b0\u01a1ng, c\u00f2n NPN d\u1eabn ngu\u1ed3n v\u1ec1 c\u1ef1c \u00e2m.<\/strong> C\u1ea5p ngu\u1ed3n cho c\u1ea3m bi\u1ebfn, n\u1ed1i d\u00e2y m\u00e0u \u0111en v\u00e0o \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c cu\u1ed9n d\u00e2y r\u01a1le, v\u00e0 m\u1ea1ch \u0111i\u1ec7n s\u1ebd \u0111\u01b0\u1ee3c \u0111\u00f3ng.<\/p>\n<p>Tr\u01b0\u1edbc khi \u0111i s\u00e2u h\u01a1n, xin l\u00e0m r\u00f5 m\u1ed9t \u0111i\u1ec1u nhanh ch\u00f3ng, v\u00ec \u0111i\u1ec1u n\u00e0y khi\u1ebfn h\u1ea7u h\u1ebft m\u1ecdi ng\u01b0\u1eddi khi truy c\u1eadp trang n\u00e0y \u0111\u1ec1u c\u1ea3m th\u1ea5y b\u1ed1i r\u1ed1i: <em>c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n<\/em> \u0110\u00e8n \u0111\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng t\u1eeb ho\u00e0ng h\u00f4n \u0111\u1ebfn b\u00ecnh minh l\u1ea1i l\u00e0 m\u1ed9t c\u00e2u chuy\u1ec7n ho\u00e0n to\u00e0n kh\u00e1c. Thi\u1ebft b\u1ecb n\u00e0y c\u1ea3m bi\u1ebfn m\u1ee9c \u0111\u1ed9 \u00e1nh s\u00e1ng xung quanh \u0111\u1ec3 b\u1eadt h\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng 120\/240 V v\u00e0o ban \u0111\u00eam. N\u00f3 kh\u00f4ng c\u00f3 kh\u00e1i ni\u1ec7m v\u1ec1 \u201cv\u1eadt th\u1ec3\u201d, v\u00e0 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n c\u1ee7a n\u00f3 l\u00e0 d\u00e2y \u0111i\u1ec7n ngu\u1ed3n. B\u00e0i vi\u1ebft n\u00e0y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u1ea3m bi\u1ebfn quang \u00e1p su\u1ea5t th\u1ea5p d\u00f9ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c b\u1ed9 ph\u1eadn, g\u00f3i h\u00e0ng v\u00e0 pallet. C\u00f4ng vi\u1ec7c kh\u00e1c nhau, h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n c\u0169ng kh\u00e1c nhau.<\/p>\n\n<h2>Ba c\u1ea5u tr\u00fac c\u1ea3m bi\u1ebfn: H\u00e3y t\u00ecm hi\u1ec3u k\u1ef9 h\u1ec7 th\u1ed1ng tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh n\u1ed1i d\u00e2y<\/h2>\n<p>Tr\u01b0\u1edbc khi ch\u1ea1m v\u00e0o b\u1ea5t k\u1ef3 s\u1ee3i d\u00e2y n\u00e0o, h\u00e3y x\u00e1c \u0111\u1ecbnh r\u00f5 b\u1ea1n \u0111ang x\u1eed l\u00fd c\u1ea5u tr\u00fac quang \u0111i\u1ec7n n\u00e0o trong ba lo\u1ea1i n\u00e0y. C\u00e1ch \u0111\u1ea5u d\u00e2y c\u1ee7a ch\u00fang kh\u00e1c nhau, v\u00e0 ch\u00ednh vi\u1ec7c \u201ctr\u00f4ng ch\u00fang gi\u1ed1ng nhau\u201d l\u00e0 nguy\u00ean nh\u00e2n d\u1eabn \u0111\u1ebfn nh\u1eefng sai l\u1ea7m \u0111\u1eaft gi\u00e1.<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>C\u1ea5u tr\u00fac<\/th><th>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 nh\u1eadn bi\u1ebft \u0111i\u1ec1u \u0111\u00f3<\/th><th>Nh\u1eefng g\u00ec thi\u1ebft b\u1ecb n\u00e0y ph\u00e1t hi\u1ec7n<\/th><th>Nh\u1eefng \u0111i\u1ec3m c\u00f2n h\u1ea1n ch\u1ebf<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>C\u1ea3m bi\u1ebfn xuy\u00ean ch\u00f9m (\u0111\u1ed1i di\u1ec7n)<\/td><td>Hai \u0111\u01a1n v\u1ecb ri\u00eang bi\u1ec7t \u0111\u1ed1i di\u1ec7n nhau, kh\u00f4ng c\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1<\/td><td>V\u1eadt th\u1ec3 c\u1ea3n tr\u1edf ch\u00f9m \u00e1nh s\u00e1ng \u0111i qua gi\u1eefa ch\u00fang<\/td><td>C\u1ea7n hai thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh th\u1eb3ng h\u00e0ng, c\u1ea3 hai \u0111\u1ec1u \u0111ang \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n; kh\u00f4ng c\u00f3 l\u1ed1i t\u1eaft ch\u1ec9 d\u00f9ng m\u1ed9t \u0111\u1ea7u<\/td><\/tr>\n<tr><td>Ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c<\/td><td>M\u1ed9t \u0111\u1ea7u chi\u1ebfu v\u00e0o t\u1ea5m ph\u1ea3n x\u1ea1<\/td><td>V\u1eadt th\u1ec3 c\u1ea3n tr\u1edf ch\u00f9m tia ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i<\/td><td>C\u00e1c v\u1eadt th\u1ec3 s\u00e1ng b\u00f3ng ho\u1eb7c gi\u1ed1ng nh\u01b0 g\u01b0\u01a1ng ph\u00eda sau m\u1ee5c ti\u00eau c\u00f3 th\u1ec3 t\u1ea1o ra \u1ea3o gi\u00e1c v\u1ec1 m\u1ed9t ch\u00f9m tia r\u00f5 n\u00e9t; ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7u ch\u1ec9nh ng\u01b0\u1ee3c ph\u00e2n c\u1ef1c c\u00f3 th\u1ec3 kh\u1eafc ph\u1ee5c ph\u1ea7n l\u1edbn hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y<\/td><\/tr>\n<tr><td>Ph\u00e2n t\u00e1n (theo kho\u1ea3ng c\u00e1ch)<\/td><td>Ch\u1ec9 c\u00f3 m\u1ed9t \u0111\u1ea7u, kh\u00f4ng c\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1; ph\u00e1t hi\u1ec7n c\u00e1c v\u1eadt th\u1ec3 ph\u00eda tr\u01b0\u1edbc<\/td><td>V\u1eadt th\u1ec3 ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng tr\u1edf l\u1ea1i ch\u00ednh \u0111\u01a1n v\u1ecb \u0111\u00f3<\/td><td>T\u1ea7m ng\u1eafn; c\u00e1c v\u1eadt th\u1ec3 m\u00e0u \u0111en ho\u1eb7c trong su\u1ed1t ph\u1ea3n x\u1ea1 k\u00e9m<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>C\u00f2n c\u00f3 nh\u1eefng bi\u1ebfn th\u1ec3 \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n, bao g\u1ed3m c\u1ea3m bi\u1ebfn ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c ph\u00e2n c\u1ef1c, c\u1ea3m bi\u1ebfn khu\u1ebfch t\u00e1n lo\u1ea1i b\u1ecf n\u1ec1n, \u0111\u1ea7u c\u1ea3m bi\u1ebfn s\u1ee3i quang, c\u1ea3m bi\u1ebfn laser v\u00e0 c\u1ea3m bi\u1ebfn nh\u1eadn di\u1ec7n m\u00e0u. T\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i n\u00e0y \u0111\u1ec1u \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n t\u1eeb ba c\u1ea5u tr\u00fac tr\u00ean, v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn v\u1eabn gi\u1eef nguy\u00ean.<\/p>\n<p>C\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh lo\u1ea1i h\u1ec7 th\u1ed1ng ch\u01b0a bi\u1ebft l\u00e0 \u0111\u1eb7t ba c\u00e2u h\u1ecfi v\u00e0 tr\u1ea3 l\u1eddi ngay t\u1ea1i m\u00e1y:<\/p>\n<ol>\n<li><strong>M\u1ed9t c\u00e1i hay hai c\u00e1i?<\/strong> Hai b\u1ed9 ph\u1eadn \u0111\u1ed1i di\u1ec7n nhau c\u00f3 ngh\u0129a l\u00e0 ch\u1ebf \u0111\u1ed9 xuy\u00ean tia. L\u01b0u \u00fd r\u1eb1ng b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu l\u00e0 <em>hai m\u00e3 s\u1ea3n ph\u1ea9m ri\u00eang bi\u1ec7t<\/em>. H\u00e3y ghi c\u1ea3 hai \u0111i\u1ec1u \u0111\u00f3 l\u1ea1i.<\/li>\n<li><strong>C\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1 kh\u00f4ng?<\/strong> \u201cC\u00f3\u201d ngh\u0129a l\u00e0 ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c. \u201cKh\u00f4ng c\u00f3 b\u1ed9 ph\u1ea3n x\u1ea1\u201d v\u00e0 \u201cm\u1ed9t \u0111\u1ea7u\u201d ngh\u0129a l\u00e0 ph\u1ea3n x\u1ea1 khu\u1ebfch t\u00e1n.<\/li>\n<li><strong>M\u00e3 s\u1ea3n ph\u1ea9m \u1edf \u0111\u00e2u v\u1eady?<\/strong> Th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u1eadp tr\u00ean th\u00e2n. \u0110\u1ed1i v\u1edbi c\u1eb7p d\u1ea7m xuy\u00ean, c\u1ea3 hai n\u1eeda \u0111\u1ec1u c\u00f3 s\u1ed1 ri\u00eang v\u00e0 c\u00e1c s\u1ed1 n\u00e0y kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng tr\u00f9ng kh\u1edbp.<\/li>\n<\/ol>\n<p>H\u00e3y \u0111\u1eb7t ba c\u00e2u h\u1ecfi n\u00e0y qua \u0111i\u1ec7n tho\u1ea1i, t\u1ea1i bu\u1ed5i th\u1ea3o lu\u1eadn ho\u1eb7c t\u1ea1i k\u1ec7 ph\u1ee5 t\u00f9ng, v\u00e0 b\u1ea1n \u0111\u00e3 ng\u0103n ch\u1eb7n \u0111\u01b0\u1ee3c sai s\u00f3t ph\u1ed5 bi\u1ebfn nh\u1ea5t khi \u0111\u1eb7t h\u00e0ng trong danh m\u1ee5c n\u00e0y: mua nh\u1ea7m <em>c\u1ea5u tr\u00fac<\/em>, v\u00ed d\u1ee5 nh\u01b0 m\u1ed9t \u0111\u1ea7u chi\u1ebfu khu\u1ebfch t\u00e1n \u0111\u1ec3 thay th\u1ebf m\u1ed9t n\u1eeda c\u1ee7a c\u1eb7p c\u1ea3m bi\u1ebfn xuy\u00ean ch\u00f9m.<\/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: Video h\u01b0\u1edbng d\u1eabn n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n\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-nocookie.com\/embed\/g3utygIYy0E?rel=0\"\n title=\"H\u01b0\u1edbng d\u1eabn \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n\"\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\n <p style=\"margin:12px 0 0; font-size:14px; line-height:1.5; color:#6E6E6E;\">\n H\u00e3y xem ph\u1ea7n tr\u00ecnh di\u1ec5n th\u1ef1c t\u1ebf v\u1ec1 c\u00e1ch \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n tr\u01b0\u1edbc khi k\u1ebft n\u1ed1i t\u00edn hi\u1ec7u \u0111\u1ea7u ra v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a PLC.\n <\/p>\n<\/div>\n\n<h2>C\u1ea5u tr\u00fac m\u1ea1ch \u0111i\u1ec7n: B\u1ed9 ph\u1eadn n\u00e0o d\u1eabn t\u00edn hi\u1ec7u \u0111\u1ea7u ra?<\/h2>\n<h3>Lo\u1ea1i xuy\u00ean ch\u00f9m: b\u1ed9 ph\u00e1t ch\u1ec9 l\u00e0 ngu\u1ed3n s\u00e1ng \u2014 b\u1ed9 thu th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng \u0111i\u1ec1u khi\u1ec3n<\/h3>\n<p>\u0110\u00e2y l\u00e0 \u0111i\u1ec1u th\u1ef1c t\u1ebf gi\u00fap gi\u1ea3i quy\u1ebft h\u1ea7u h\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111\u1ea5u d\u00e2y xuy\u00ean thanh, v\u00e0 c\u0169ng l\u00e0 \u0111i\u1ec1u c\u1ea7n ghi nh\u1edb nh\u1ea5t t\u1eeb to\u00e0n b\u1ed9 b\u00e0i vi\u1ebft n\u00e0y:<\/p>\n<p><strong>Tr\u00ean c\u1ea3m bi\u1ebfn tia xuy\u00ean, t\u00edn hi\u1ec7u \u0111\u1ea7u ra lu\u00f4n \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1ea1i b\u1ed9 thu: b\u1ed9 ph\u00e1t ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t ngu\u1ed3n s\u00e1ng, v\u00e0 hai n\u1eeda c\u1ee7a c\u1ea3m bi\u1ebfn c\u00f3 m\u00e3 s\u1ea3n ph\u1ea9m kh\u00e1c nhau.<\/strong><\/p>\n\n\n<div class=\"bp-1-thrub\">\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=\"M4.9 16.1C1 12.2 1 5.8 4.9 1.9\"\/><path d=\"M7.8 4.7a6.14 6.14 0 0 0-.8 7.5\"\/><circle cx=\"12\" cy=\"9\" r=\"2\"\/><path d=\"M16.2 4.8c2 2 2.26 5.11.8 7.47\"\/><path d=\"M19.1 1.9a9.96 9.96 0 0 1 0 14.1\"\/><path d=\"M9.5 18h5\"\/><path d=\"m8 22 4-11 4 11\"\/><\/svg><\/span>Hai thi\u1ebft b\u1ecb. Ch\u1ec9 c\u00f3 m\u1ed9t thi\u1ebft b\u1ecb th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng chuy\u1ec3n m\u1ea1ch.<\/p>\n<div class=\"bp-1-pair\">\n<div class=\"bp-1-unit\">\n<p class=\"bp-1-unit-name\">B\u1ed9 ph\u00e1t<\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BN<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>+12\u201324 V DC<\/span><\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BU<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>0 V<\/span><\/p>\n<p class=\"bp-1-note\">Th\u01b0\u1eddng ch\u1ec9 c\u00f3 hai d\u00e2y<\/p>\n<\/div>\n<div class=\"bp-1-beam\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" 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><\/div>\n<div class=\"bp-1-unit\">\n<p class=\"bp-1-unit-name\">B\u1ed9 thu<\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BN<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>+12\u201324 V DC<\/span><\/p>\n<p class=\"bp-1-wire\"><span class=\"bp-1-wire-code\">BU<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>0 V<\/span><\/p>\n<p class=\"bp-1-wire bp-1-out\"><span class=\"bp-1-wire-left\"><span class=\"bp-1-wire-code\">BK<\/span><span class=\"bp-1-wire-arrow\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" 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><span>\u0110\u1ea7u v\u00e0o ho\u1eb7c t\u1ea3i c\u1ee7a PLC<\/span><\/span><span class=\"bp-1-out-tag\">\u0110\u1ea7u ra<\/span><\/p>\n<\/div>\n<\/div>\n<hr class=\"bp-1-divider\">\n<p class=\"bp-1-foot\">B\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu l\u00e0 hai m\u00e3 s\u1ea3n ph\u1ea9m ri\u00eang bi\u1ec7t \u2014 h\u00e3y n\u1ed1i d\u00e2y cho c\u1ea3 hai thi\u1ebft b\u1ecb v\u00e0 \u0111\u1eb7t h\u00e0ng ch\u00fang theo c\u1eb7p.<\/p>\n<\/div>\n\n<p>Tr\u01b0\u1edbc ti\u00ean, h\u00e3y n\u1ed1i d\u00e2y cho b\u1ed9 ph\u00e1t: d\u00e2y n\u00e2u n\u1ed1i v\u1edbi +V, d\u00e2y xanh d\u01b0\u01a1ng n\u1ed1i v\u1edbi 0 V. Th\u01b0\u1eddng th\u00ec ch\u1ec9 c\u00f3 v\u1eady th\u00f4i, v\u00ec nhi\u1ec1u b\u1ed9 ph\u00e1t l\u00e0 thi\u1ebft b\u1ecb hai d\u00e2y. Sau \u0111\u00f3, n\u1ed1i d\u00e2y cho b\u1ed9 thu: d\u00e2y n\u00e2u n\u1ed1i v\u1edbi +V, d\u00e2y xanh d\u01b0\u01a1ng n\u1ed1i v\u1edbi 0 V, v\u00e0 d\u00e2y \u0111en (d\u00e2y ra) n\u1ed1i v\u1edbi \u0111\u1ea7u v\u00e0o PLC ho\u1eb7c t\u1ea3i c\u1ee7a b\u1ea1n (<a href=\"https:\/\/www.realpars.com\/blog\/photoelectric-sensor-wiring\">RealPars, c\u00e1ch \u0111\u1ea5u d\u00e2y v\u00e0 c\u00e0i \u0111\u1eb7t c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n<\/a>). N\u1ebfu b\u1ea1n c\u1ea5p ngu\u1ed3n cho b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu nh\u01b0ng kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u, c\u00e1c nguy\u00ean nh\u00e2n th\u01b0\u1eddng g\u1eb7p l\u00e0: d\u00e2y m\u00e0u \u0111en \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi b\u1ed9 ph\u00e1t (kh\u00f4ng c\u00f3 c\u00f4ng t\u1eafc n\u00e0o \u1edf \u0111\u00f3), c\u1eb7p thi\u1ebft b\u1ecb kh\u00f4ng \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh \u0111\u00fang, ho\u1eb7c lo\u1ea1i \u0111\u1ea7u ra kh\u00f4ng kh\u1edbp v\u1edbi \u0111\u1ea7u v\u00e0o c\u1ee7a b\u1ea1n \u2013 v\u1ea5n \u0111\u1ec1 n\u00e0y ch\u00fang ta s\u1ebd \u0111\u1ec1 c\u1eadp ngay sau \u0111\u00e2y. C\u1ea3 hai thi\u1ebft b\u1ecb \u0111\u1ec1u c\u1ea7n \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n; ch\u1ec9 c\u00f3 b\u1ed9 thu l\u00e0 c\u00f3 c\u00f4ng t\u1eafc.<\/p>\n<h3>C\u1ea3m bi\u1ebfn m\u1ed9t \u0111\u1ea7u v\u00e0 d\u00e2y th\u1ee9 t\u01b0: Ch\u1ee9c n\u0103ng c\u1ee7a d\u00e2y \u201ctr\u1eafng\u201d l\u00e0 g\u00ec<\/h3>\n<p>C\u00e1c \u0111\u1ea7u ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c v\u00e0 \u0111\u1ea7u ph\u1ea3n x\u1ea1 khu\u1ebfch t\u00e1n l\u00e0 c\u00e1c \u0111\u01a1n v\u1ecb \u0111\u1ed9c l\u1eadp, do \u0111\u00f3 ch\u00fang tu\u00e2n theo c\u1ea5u tr\u00fac ba d\u00e2y \u0111\u01a1n gi\u1ea3n nh\u01b0 \u0111\u00e3 n\u00eau \u1edf tr\u00ean. V\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p b\u1eaft \u0111\u1ea7u xu\u1ea5t hi\u1ec7n khi c\u00f3 th\u00eam d\u00e2y th\u1ee9 t\u01b0. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ba c\u00e1ch m\u00e0 c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t s\u1eed d\u1ee5ng d\u00e2y n\u00e0y, c\u00f9ng \u00fd ngh\u0129a c\u1ee7a t\u1eebng c\u00e1ch \u0111\u1ed1i v\u1edbi b\u1ea1n:<\/p>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>K\u1ebf ho\u1ea1ch<\/th><th>D\u00e2y<\/th><th>H\u00e0nh vi<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Ch\u1ebf \u0111\u1ed9 b\u1eadt tr\u00ean n\u1ec1n s\u00e1ng\/b\u1eadt tr\u00ean n\u1ec1n t\u1ed1i c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn<\/td><td>Tr\u1eafng<\/td><td>N\u1ed1i d\u00e2y m\u00e0u tr\u1eafng v\u1edbi c\u1ef1c d\u01b0\u01a1ng (+V) \u0111\u1ec3 \u0111\u00e8n s\u00e1ng; n\u1ed1i v\u1edbi 0 V \u0111\u1ec3 \u0111\u00e8n t\u1eaft<\/td><\/tr>\n<tr><td>C\u00e1c k\u1ebft qu\u1ea3 b\u1ed5 sung<\/td><td>M\u00e0u tr\u1eafng ho\u1eb7c m\u00e0u \u0111en th\u1ee9 hai<\/td><td>Hai \u0111\u1ea7u ra tr\u1ef1c ti\u1ebfp (m\u1ed9t lo\u1ea1i ho\u1ea1t \u0111\u1ed9ng khi s\u00e1ng, m\u1ed9t lo\u1ea1i ho\u1ea1t \u0111\u1ed9ng khi t\u1ed1i); h\u00e3y ch\u1ecdn lo\u1ea1i ph\u00f9 h\u1ee3p v\u1edbi m\u00e1y c\u1ee7a b\u1ea1n<\/td><\/tr>\n<tr><td>D\u1ea1y ho\u1eb7c ki\u1ec3m tra \u0111\u1ea7u v\u00e0o<\/td><td>Tr\u1eafng ho\u1eb7c x\u00e1m<\/td><td>Ch\u1ebf \u0111\u1ed9 xung \u0111\u1ec3 thi\u1ebft l\u1eadp ng\u01b0\u1ee1ng ho\u1eb7c d\u00f9ng l\u00e0m t\u00edn hi\u1ec7u ki\u1ec3m tra; \u0111\u1ec3 \u1edf ch\u1ebf \u0111\u1ed9 n\u1ed5i trong ch\u1ebf \u0111\u1ed9 ch\u1ea1y b\u00ecnh th\u01b0\u1eddng<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>C\u00f3 hai l\u01b0u \u00fd th\u1ef1c t\u1ebf \u1edf \u0111\u00e2y. Th\u1ee9 nh\u1ea5t: khi d\u00e2y ch\u1ecdn ch\u1ebf \u0111\u1ed9 s\u00e1ng\/t\u1ed1i v\u1eabn c\u00f2n <em>ch\u01b0a k\u1ebft th\u00fac<\/em>, c\u1ea3m bi\u1ebfn v\u1eabn ho\u1ea1t \u0111\u1ed9ng \u1edf ch\u1ebf \u0111\u1ed9 m\u1eb7c \u0111\u1ecbnh c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t. C\u00e1c thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh c\u00f3 th\u1ec3 kh\u00e1c nhau, v\u00ec v\u1eady \u0111\u1eebng bao gi\u1edd ch\u1ee7 quan: h\u00e3y ki\u1ec3m tra d\u00f2ng \u201cs\u01a1 \u0111\u1ed3 k\u1ebft n\u1ed1i\u201d trong b\u1ea3ng d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt, v\u00e0 n\u1ebfu s\u01a1 \u0111\u1ed3 \u0111\u00f3 kh\u00f4ng r\u00f5 r\u00e0ng (\u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng x\u1ea3y ra), h\u00e3y h\u1ecfi nh\u00e0 cung c\u1ea5p tr\u01b0\u1edbc khi \u0111\u01b0a m\u00e1y v\u00e0o v\u1eadn h\u00e0nh. Th\u1ee9 hai: m\u1ed9t s\u1ed1 c\u1ea3m bi\u1ebfn in k\u00fd hi\u1ec7u NO\/NC tr\u00ean th\u00e2n c\u1ea3m bi\u1ebfn trong khi b\u1ea3ng d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt l\u1ea1i s\u1eed d\u1ee5ng thu\u1eadt ng\u1eef \u201clight-on\u201d\/\u201cdark-on\u201d. Nh\u00e3n in n\u00e0y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn tr\u1ea1ng th\u00e1i kh\u00f4ng c\u00f3 ngu\u1ed3n \u0111i\u1ec7n v\u00e0 g\u00e2y nh\u1ea7m l\u1eabn cho nhi\u1ec1u ng\u01b0\u1eddi h\u01a1n l\u00e0 gi\u00fap \u00edch. H\u00e3y tin t\u01b0\u1edfng v\u00e0o s\u01a1 \u0111\u1ed3 k\u1ebft n\u1ed1i trong b\u1ea3ng d\u1eef li\u1ec7u, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u00e0o nh\u00e3n in tr\u00ean th\u00e2n c\u1ea3m bi\u1ebfn.<\/p>\n<p>C\u00f2n m\u1ed9t \u0111i\u1ec1u n\u1eefa c\u1ea7n l\u01b0u \u00fd khi thay th\u1ebf: c\u00e1c c\u1ea3m bi\u1ebfn ng\u1eaft k\u1ebft n\u1ed1i nhanh (M8\/M12). \u0110\u1ea7u n\u1ed1i c\u00f3 th\u1ec3 tr\u00f4ng gi\u1ed1ng h\u1ec7t nhau, nh\u01b0ng ch\u1ee9c n\u0103ng c\u1ee7a c\u00e1c ch\u00e2n c\u1eafm \u0111\u01b0\u1ee3c nh\u00e0 s\u1ea3n xu\u1ea5t ch\u1ec9 \u0111\u1ecbnh s\u1eb5n. M\u1ed9t thi\u1ebft b\u1ecb c\u00f3 c\u1ea5u h\u00ecnh \u201cch\u00e2n 4 = \u0111\u1ea7u ra\u201d s\u1ebd kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c v\u1edbi d\u00e2y c\u00e1p \u0111\u01b0\u1ee3c n\u1ed1i theo c\u1ea5u h\u00ecnh \u201cch\u00e2n 2 = \u0111\u1ea7u ra\u201d. Khi \u0111\u1eb7t h\u00e0ng c\u1ea3m bi\u1ebfn ng\u1eaft k\u1ebft n\u1ed1i nhanh, s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm ph\u1ea3i kh\u1edbp v\u1edbi d\u00e2y c\u00e1p \u0111\u00e3 c\u00f3 s\u1eb5n trong m\u00e1y.<\/p>\n\n<h2>Light-On so v\u1edbi Dark-On: \u1ee8ng d\u1ee5ng c\u1ee7a b\u1ea1n c\u1ea7n lo\u1ea1i logic \u0111\u1ea7u ra n\u00e0o?<\/h2>\n<p>B\u1ea1n \u0111\u00e3 n\u1ed1i \u0111\u00fang t\u1eebng s\u1ee3i d\u00e2y, ngu\u1ed3n \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1eadt, nh\u01b0ng c\u1ea3m bi\u1ebfn v\u1eabn ho\u1ea1t \u0111\u1ed9ng ng\u01b0\u1ee3c l\u1ea1i v\u1edbi y\u00eau c\u1ea7u c\u1ee7a m\u00e1y. Ch\u1ebf \u0111\u1ed9 \u201cb\u1eadt khi s\u00e1ng\/b\u1eadt khi t\u1ed1i\u201d l\u00e0 ch\u1ee7 \u0111\u1ec1 g\u00e2y nh\u1ea7m l\u1eabn nh\u1ea5t trong vi\u1ec7c n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n, v\u00e0 \u0111\u00e2y c\u0169ng l\u00e0 v\u1ea5n \u0111\u1ec1 m\u00e0 ngay c\u1ea3 c\u00e1c chuy\u00ean gia c\u0169ng c\u00f3 nh\u1eefng quan \u0111i\u1ec3m tr\u00e1i chi\u1ec1u.<\/p>\n<h3>\u00dd ngh\u0129a th\u1ef1c s\u1ef1 c\u1ee7a \u201clight-on\u201d v\u00e0 \u201cdark-on\u201d (v\u00e0 l\u00fd do t\u1ea1i sao \u201cNO\/NC\u201d l\u1ea1i khi\u1ebfn nhi\u1ec1u ng\u01b0\u1eddi b\u1ed1i r\u1ed1i)<\/h3>\n<p>C\u00e1c \u0111\u1ecbnh ngh\u0129a v\u1ec1 m\u1eb7t v\u1eadt l\u00fd r\u1ea5t \u0111\u01a1n gi\u1ea3n: m\u1ed9t <strong>\u0111\u00e8n s\u00e1ng<\/strong> thi\u1ebft b\u1ecb \u0111\u1ea7u ra s\u1ebd \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n khi b\u1ed9 thu nh\u1eadn \u0111\u1ee7 \u00e1nh s\u00e1ng; a <strong>dark-on<\/strong> \u0111\u1ea7u ra s\u1ebd k\u00edch ho\u1ea1t khi ch\u00f9m tia b\u1ecb che khu\u1ea5t ho\u1eb7c b\u1ed9 thu m\u1ea5t t\u00edn hi\u1ec7u (<a href=\"https:\/\/control.com\/technical-articles\/what-do-light-on-and-dark-on-mean-for-photoelectric-sensors\/\">control.com, \u00fd ngh\u0129a c\u1ee7a \u201clight-on\u201d v\u00e0 \u201cdark-on\u201d l\u00e0 g\u00ec<\/a>). V\u1ea5n \u0111\u1ec1 n\u1ea3y sinh khi ng\u01b0\u1eddi ta chuy\u1ec3n kh\u00e1i ni\u1ec7m n\u00e0y sang ng\u00f4n ng\u1eef \u201cth\u01b0\u1eddng m\u1edf\u201d\/\u201cth\u01b0\u1eddng \u0111\u00f3ng\u201d c\u1ee7a c\u00e1c c\u00f4ng t\u1eafc c\u01a1 kh\u00ed. M\u1ed9t b\u00e0i vi\u1ebft tr\u00ean blog c\u1ee7a m\u1ed9t nh\u00e0 s\u1ea3n xu\u1ea5t l\u1edbn \u0111\u00e3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi \u201cCh\u1ebf \u0111\u1ed9 \u2018\u0111\u00e8n s\u00e1ng\u2019 c\u00f3 gi\u1ed1ng v\u1edbi NO kh\u00f4ng?\u201d b\u1eb1ng c\u00e2u \u201cC\u00e2u tr\u1ea3 l\u1eddi ng\u1eafn g\u1ecdn l\u00e0 c\u00f3\u201d, sau \u0111\u00f3 \u0111\u1ecbnh ngh\u0129a ch\u1ebf \u0111\u1ed9 \u201cth\u00f4ng qua ch\u00f9m tia\u201d l\u00e0 \u201cth\u01b0\u1eddng \u0111\u00f3ng\u201d v\u00e0 ch\u1ebf \u0111\u1ed9 \u201cph\u00e2n t\u00e1n\u201d l\u00e0 \u201cth\u01b0\u1eddng m\u1edf\u201d (<a href=\"https:\/\/www.balluff.com\/en-us\/blog\/photoelectric-basics-light-on-or-dark-on\">Balluff, ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: ch\u1ebf \u0111\u1ed9 b\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng ho\u1eb7c ch\u1ebf \u0111\u1ed9 b\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng<\/a>), trong khi t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00ednh Omron \u0111\u1ecbnh ngh\u0129a ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n s\u1ef1 hi\u1ec7n di\u1ec7n khu\u1ebfch t\u00e1n \u0111i\u1ec3n h\u00ecnh l\u00e0 \u201c\u0111\u00e8n s\u00e1ng\u201d (<a href=\"https:\/\/www.ia.omron.com\/support\/guide\/43\/explanation_of_terms.html\">Omron, c\u00e1c thu\u1eadt ng\u1eef v\u1ec1 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n<\/a>). Hai ngu\u1ed3n \u0111\u00e1ng tin c\u1eady, hai b\u1ea3n d\u1ecbch kh\u00e1c nhau.<\/p>\n<p>\u0110\u00e2y l\u00e0 \u0111\u1ecbnh ngh\u0129a. NO\/NC \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a d\u1ef1a tr\u00ean m\u1ed9t <em>tr\u1ea1ng th\u00e1i ngh\u1ec9<\/em>, nh\u01b0ng tr\u1ea1ng th\u00e1i ngh\u1ec9 c\u1ee7a c\u1ea3m bi\u1ebfn quang ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea5u tr\u00fac c\u1ee7a n\u00f3. M\u1ed9t b\u1ed9 thu tia xuy\u00ean qua s\u1ebd \u1edf tr\u1ea1ng th\u00e1i s\u00e1ng khi kh\u00f4ng c\u00f3 v\u1eadt c\u1ea3n n\u00e0o trong ch\u00f9m tia; c\u00f2n \u0111\u1ea7u c\u1ea3m bi\u1ebfn khu\u1ebfch t\u00e1n s\u1ebd \u1edf tr\u1ea1ng th\u00e1i t\u1ed1i. V\u1eady n\u00ean h\u00e3y b\u1ecf qua ph\u1ea7n d\u1ecbch v\u00e0 thay v\u00e0o \u0111\u00f3 h\u00e3y \u0111\u1eb7t m\u1ed9t c\u00e2u h\u1ecfi: <strong>Khi \u0111\u1ed1i t\u01b0\u1ee3ng T\u1ed2N T\u1ea0I, k\u1ebft qu\u1ea3 \u0111\u1ea7u ra ph\u1ea3i l\u00e0 g\u00ec?<\/strong> V\u1eady th\u00ec h\u00e3y \u0111\u1ec3 c\u1ea5u tr\u00fac ch\u1ec9 cho b\u1ea1n bi\u1ebft ch\u1ebf \u0111\u1ed9 n\u00e0o s\u1ebd th\u1ef1c hi\u1ec7n \u0111i\u1ec1u \u0111\u00f3.<\/p>\n<h3>L\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean c\u1ea5u tr\u00fac: b\u00e0n l\u1eadt v\u00e0 h\u01b0\u1edbng an to\u00e0n<\/h3>\n\n<div class=\"rich-table-wrap\">\n<table class=\"rich-table\">\n<thead>\n<tr><th>C\u1ea5u tr\u00fac<\/th><th>Ch\u00f9m tia \u1edf tr\u1ea1ng th\u00e1i ngh\u1ec9 (kh\u00f4ng ph\u00e1t hi\u1ec7n th\u1ea5y g\u00ec)<\/th><th>C\u1ea7n b\u1eadt t\u00edn hi\u1ec7u \u0111\u1ea7u ra khi c\u00f3 v\u1eadt th\u1ec3 hi\u1ec7n di\u1ec7n<\/th><th>L\u00f4gic \u0111i\u1ec3n h\u00ecnh<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>C\u1ea3m bi\u1ebfn xuy\u00ean tia<\/td><td>\u0110\u00e8n b\u00e1o s\u00e1ng (\u0111\u00e8n tr\u00ean b\u1ed9 thu s\u00e1ng)<\/td><td>Ch\u1ebf \u0111\u1ed9 Dark-on: v\u1eadt th\u1ec3 che khu\u1ea5t ch\u00f9m tia<\/td><td>B\u1eadt ch\u1ebf \u0111\u1ed9 Dark-on \u0111\u1ec3 ph\u00e1t hi\u1ec7n kho\u1ea3ng ngh\u1ec9<\/td><\/tr>\n<tr><td>Ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c<\/td><td>C\u00f3 \u00e1nh s\u00e1ng (tia s\u00e1ng ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i t\u1eeb g\u01b0\u01a1ng ph\u1ea3n x\u1ea1)<\/td><td>Ch\u1ebf \u0111\u1ed9 Dark-on: v\u1eadt th\u1ec3 che khu\u1ea5t ch\u00f9m tia<\/td><td>B\u1eadt ch\u1ebf \u0111\u1ed9 Dark-on \u0111\u1ec3 ph\u00e1t hi\u1ec7n kho\u1ea3ng ngh\u1ec9<\/td><\/tr>\n<tr><td>Ph\u1ed5 bi\u1ebfn<\/td><td>T\u1ed1i (kh\u00f4ng ph\u1ea3n chi\u1ebfu khi \u1edf tr\u1ea1ng th\u00e1i t\u0129nh)<\/td><td>Ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng: v\u1eadt th\u1ec3 ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng tr\u1edf l\u1ea1i<\/td><td>B\u1eadt \u0111\u00e8n \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 hi\u1ec7n di\u1ec7n<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<p>H\u00e3y \u0111\u1ecdc k\u1ef9 b\u1ea3ng \u0111\u00f3 hai l\u1ea7n, v\u00ec \u0111\u00f3 ch\u00ednh l\u00e0 n\u01a1i \u1ea9n ch\u1ee9a nh\u1eefng sai s\u00f3t: y\u00eau c\u1ea7u \u201cb\u1eadt l\u00ean khi linh ki\u1ec7n \u0111\u1ebfn\u201d \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 <em>dark-on<\/em> tr\u00ean m\u1ed9t c\u1eb7p thanh d\u1eabn xuy\u00ean v\u00e0 <em>\u0111\u00e8n s\u00e1ng<\/em> tr\u00ean m\u1ed9t \u0111\u1ea7u ph\u00e2n t\u00e1n. N\u1ebfu s\u1eafp x\u1ebfp logic sai, t\u00edn hi\u1ec7u \u201cc\u00f3 b\u1ed9 ph\u1eadn\u201d s\u1ebd chuy\u1ec3n th\u00e0nh \u201cthi\u1ebfu b\u1ed9 ph\u1eadn\u201d. M\u00e1y s\u1ebd g\u1eb7p l\u1ed7i, c\u1ea5p li\u1ec7u qu\u00e1 m\u1ee9c ho\u1eb7c th\u1eadm ch\u00ed t\u1ec7 h\u01a1n, v\u1edbi c\u00e1c bi\u1ec3u hi\u1ec7n tr\u00f4ng gi\u1ed1ng nh\u01b0 l\u1ed7i d\u00e2y \u0111i\u1ec7n.<\/p>\n<p>N\u1ebfu b\u1ea1n \u0111\u00e3 mua m\u1ed9t c\u1ea3m bi\u1ebfn c\u00f3 \u0111\u1ea7u ra c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn ho\u1eb7c \u0111\u1ea7u ra b\u1ed5 sung, v\u1ea5n \u0111\u1ec1 n\u00e0y c\u00f3 th\u1ec3 kh\u1eafc ph\u1ee5c ngay t\u1ea1i \u0111\u1ea7u n\u1ed1i: n\u1ed1i l\u1ea1i d\u00e2y m\u00e0u tr\u1eafng, ho\u1eb7c chuy\u1ec3n d\u00e2y t\u00edn hi\u1ec7u sang \u0111\u1ea7u ra b\u1ed5 sung. Kh\u00f4ng c\u1ea7n ph\u1ea3i mua th\u00eam thi\u1ebft b\u1ecb m\u1edbi. V\u00e0 n\u1ebfu b\u1ea1n \u0111ang thay th\u1ebf m\u1ed9t c\u1ea3m bi\u1ebfn c\u0169, h\u00e3y quan s\u00e1t c\u1ea3m bi\u1ebfn c\u0169 trong su\u1ed1t m\u1ed9t chu k\u1ef3 ho\u00e0n ch\u1ec9nh v\u00e0 l\u01b0u \u00fd xem \u0111\u1ea7u ra c\u00f3 b\u1eadt khi b\u1ed9 ph\u1eadn \u0111\u00f3 c\u00f3 m\u1eb7t hay v\u1eafng m\u1eb7t. Quan s\u00e1t n\u00e0y c\u00f2n ch\u00ednh x\u00e1c h\u01a1n b\u1ea5t k\u1ef3 nh\u00e3n m\u00e1c n\u00e0o.<\/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>M\u1ed9t c\u1ea3m bi\u1ebfn quang ti\u00eau chu\u1ea9n kh\u00f4ng ph\u1ea3i l\u00e0 thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn v\u1ec1 an to\u00e0n. Tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng \u0111\u01b0\u1ee3c d\u1ef1a v\u00e0o thi\u1ebft b\u1ecb n\u00e0y, d\u00f9 \u1edf b\u1ea5t k\u1ef3 ch\u1ebf \u0111\u1ed9 k\u1ebft n\u1ed1i n\u00e0o, trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u1ea7n ph\u00e1t hi\u1ec7n tay ho\u1eb7c c\u01a1 th\u1ec3 \u0111ang d\u1eebng l\u1ea1i; \u0111\u00f3 l\u00e0 nhi\u1ec7m v\u1ee5 c\u1ee7a r\u00e8m \u00e1nh s\u00e1ng an to\u00e0n \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn. V\u00e0 khi b\u1ea1n ch\u1ecdn ch\u1ebf \u0111\u1ed9 \u201cb\u1eadt khi s\u00e1ng\u201d (light-on) ho\u1eb7c \u201cb\u1eadt khi t\u1ed1i\u201d (dark-on), h\u00e3y l\u01b0u \u00fd \u0111\u1ebfn h\u01b0\u1edbng s\u1ef1 c\u1ed1: \u1ed1ng k\u00ednh b\u1ea9n, ch\u00f9m tia y\u1ebfu d\u1ea7n ho\u1eb7c m\u1ea5t ngu\u1ed3n \u0111i\u1ec7n ph\u1ea3i khi\u1ebfn thi\u1ebft b\u1ecb chuy\u1ec3n sang tr\u1ea1ng th\u00e1i d\u1eebng\/l\u1ed7i, ch\u1ee9 kh\u00f4ng ph\u1ea3i tr\u1ea1ng th\u00e1i \u201can to\u00e0n\u201d.<\/p>\n<\/div>\n\n<h2>L\u1ef1a ch\u1ecdn \u0111\u1ea7u v\u00e0o ph\u00f9 h\u1ee3p cho PLC c\u1ee7a b\u1ea1n \u2014 v\u00e0 \u0111\u1eb7t mua linh ki\u1ec7n thay th\u1ebf ho\u1ea1t \u0111\u1ed9ng ngay t\u1eeb l\u1ea7n \u0111\u1ea7u ti\u00ean<\/h2>\n<p>C\u00e1c c\u1ea3m bi\u1ebfn quang DC \u0111\u01b0\u1ee3c \u0111\u1eb7t h\u00e0ng d\u01b0\u1edbi d\u1ea1ng PNP ho\u1eb7c NPN, v\u00e0 trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, l\u1ef1a ch\u1ecdn n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh s\u1eb5n t\u1ea1i nh\u00e0 m\u00e1y. Thi\u1ebft b\u1ecb kh\u00f4ng c\u00f3 c\u00f4ng t\u1eafc \u0111i\u1ec1u ch\u1ec9nh t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng, do \u0111\u00f3 h\u00e3y x\u00e1c nh\u1eadn lo\u1ea1i t\u00edn hi\u1ec7u \u0111\u1ea7u ra m\u00e0 thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o c\u1ee7a b\u1ea1n y\u00eau c\u1ea7u tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u00e0i ki\u1ec3m tra t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng ch\u1ec9 m\u1ea5t ba m\u01b0\u01a1i gi\u00e2y:<\/p>\n<ol>\n<li>N\u1ed1i tr\u1ef1c ti\u1ebfp \u0111\u1ea7u v\u00e0o PLC \u0111ang \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u1edbi ngu\u1ed3n +24 V. N\u1ebfu \u0111\u1ea7u v\u00e0o b\u1eadt, th\u00ec th\u1ebb \u0111ang \u1edf ch\u1ebf \u0111\u1ed9 ngu\u1ed3n ra: n\u00f3 c\u1ea7n m\u1ed9t <strong>PNP<\/strong> c\u1ea3m bi\u1ebfn.<\/li>\n<li>N\u1ebfu kh\u00f4ng, h\u00e3y n\u1ed1i \u0111\u1ea7u v\u00e0o v\u1edbi 0 V. N\u1ebfu l\u00fac n\u00e0y thi\u1ebft b\u1ecb b\u1eadt l\u00ean, th\u00ec th\u1ebb \u0111ang \u1edf ch\u1ebf \u0111\u1ed9 h\u00fat d\u00f2ng: n\u00f3 c\u1ea7n m\u1ed9t <strong>NPN<\/strong> c\u1ea3m bi\u1ebfn.<\/li>\n<\/ol>\n<p>V\u1eady th\u00ec h\u00e3y ghi nh\u1edb \u0111i\u1ec1u n\u00e0y: m\u1ed9t c\u1ea3m bi\u1ebfn NPN \u0111i\u1ec1u khi\u1ec3n \u0111\u1ea7u v\u00e0o ngu\u1ed3n \u201cc\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m cho ho\u1ea1t \u0111\u1ed9ng\u201d nh\u1edd m\u1ed9t \u0111i\u1ec7n tr\u1edf k\u00e9o l\u00ean ho\u1eb7c m\u1ed9t r\u01a1le trung gian. R\u01a1le th\u1ef1c s\u1ef1 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i, nh\u01b0ng \u0111\u00f3 ch\u1ec9 l\u00e0 gi\u1ea3i ph\u00e1p t\u1ea1m b\u1ee3 t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng v\u1edbi nh\u1eefng chi ph\u00ed th\u1ef1c t\u1ebf: th\u00eam m\u1ed9t linh ki\u1ec7n cho m\u1ed7i k\u00eanh, t\u1ed1c \u0111\u1ed9 ph\u1ea3n h\u1ed3i ch\u1eadm h\u01a1n v\u00e0 ph\u1ea3i b\u1ea3o tr\u00ec ti\u1ebfp \u0111i\u1ec3m. \u0110\u00e2y ch\u1ec9 l\u00e0 m\u1ed9t bi\u1ec7n ph\u00e1p t\u1ea1m th\u1eddi \u0111\u1ec3 h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t thi\u1ebft k\u1ebf \u0111\u00fang \u0111\u1eafn. Gi\u1ea3i ph\u00e1p tri\u1ec7t \u0111\u1ec3 l\u00e0 \u0111\u1eb7t h\u00e0ng v\u1edbi c\u1ef1c t\u00ednh ch\u00ednh x\u00e1c, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao \u0111\u01a1n \u0111\u1eb7t h\u00e0ng c\u1ee7a b\u1ea1n c\u1ea7n ph\u1ea3i c\u1ee5 th\u1ec3. Khi thay th\u1ebf m\u1ed9t c\u1ea3m bi\u1ebfn quang, h\u00e3y \u0111\u01b0a danh s\u00e1ch ki\u1ec3m tra n\u00e0y cho nh\u00e0 cung c\u1ea5p. M\u1ed7i m\u1ee5c trong danh s\u00e1ch \u0111\u1ec1u t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t th\u00f4ng s\u1ed1 m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c t\u1eeb thi\u1ebft b\u1ecb c\u0169:<\/p>\n\n<div class=\"rich-checklist\">\n<p class=\"rich-checklist-title\"><span class=\"rich-checklist-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=\"M13 5h8\"\/><path d=\"M13 12h8\"\/><path d=\"M13 19h8\"\/><path d=\"m3 17 2 2 4-4\"\/><path d=\"m3 7 2 2 4-4\"\/><\/svg><\/span>S\u00e1u th\u00f4ng tin c\u1ea7n ghi l\u1ea1i tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng c\u1ea3m bi\u1ebfn quang thay th\u1ebf<\/p>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>1. C\u1ea5u tr\u00fac c\u1ea3m bi\u1ebfn: lo\u1ea1i xuy\u00ean tia (c\u1ea3 hai m\u00e3 s\u1ea3n ph\u1ea9m: b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu), lo\u1ea1i ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c ho\u1eb7c lo\u1ea1i khu\u1ebfch t\u00e1n<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>2 Lo\u1ea1i \u0111\u1ea7u ra: PNP ho\u1eb7c NPN (ho\u1eb7c r\u01a1le \/ AC 2 d\u00e2y, \u0111\u1ed1i v\u1edbi c\u00e1c m\u00e1y c\u0169)<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>3. Logic \u0111\u1ea7u ra: b\u1eadt khi s\u00e1ng, b\u1eadt khi t\u1ed1i, c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn ho\u1eb7c b\u1ed5 sung<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>4 Ngu\u1ed3n c\u1ea5p v\u00e0 s\u1ed1 d\u00e2y: 12\u201324 V DC; 3 d\u00e2y ho\u1eb7c 4 d\u00e2y; chi\u1ec1u d\u00e0i d\u00e2y d\u1eabn ho\u1eb7c s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm M8\/M12<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>5. Ph\u1ea1m vi ph\u00e1t hi\u1ec7n v\u00e0 c\u00e1ch l\u1eafp \u0111\u1eb7t: ki\u1ec3m tra gi\u00e1 \u0111\u1ee1 c\u0169 v\u00e0 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u0169<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>6. M\u00f4i tr\u01b0\u1eddng: c\u00f3 th\u1ec3 phun n\u01b0\u1edbc, c\u00f3 b\u1ee5i ho\u1eb7c ngo\u00e0i tr\u1eddi; \u0111\u1ea1t ho\u1eb7c v\u01b0\u1ee3t m\u1ee9c x\u1ebfp h\u1ea1ng IP c\u0169<\/p><\/div>\n<\/div>\n\n<p>N\u1ebfu nh\u00e3n tr\u00ean thi\u1ebft b\u1ecb c\u0169 \u0111\u00e3 b\u1ecb m\u00f2n ho\u1eb7c bong tr\u00f3c, h\u00e3y th\u1ef1c hi\u1ec7n danh s\u00e1ch ki\u1ec3m tra theo tr\u00ecnh t\u1ef1 ng\u01b0\u1ee3c l\u1ea1i c\u00f9ng v\u1edbi nh\u00e0 cung c\u1ea5p \u2013 ng\u01b0\u1eddi c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean b\u1ed1i c\u1ea3nh c\u1ee7a m\u00e1y (c\u00e1ch l\u1eafp \u0111\u1eb7t, ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng) thay v\u00ec ph\u1ecfng \u0111o\u00e1n d\u1ef1a tr\u00ean h\u00ecnh \u1ea3nh.<\/p>\n\n<h2>D\u00e2y \u0111i\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u00fang c\u00e1ch nh\u01b0ng c\u1ea3m bi\u1ebfn v\u1eabn kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng? \u0110\u1eb7t l\u1ecbch ch\u1ea9n \u0111o\u00e1n t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/h2>\n<p>Khi m\u1ed9t c\u1ea3m bi\u1ebfn quang v\u1eeba \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t g\u1eb7p s\u1ef1 c\u1ed1, h\u00e3y ti\u1ebfn h\u00e0nh ch\u1ea9n \u0111o\u00e1n theo th\u1ee9 t\u1ef1 sau \u0111\u00e2y. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m h\u00e0ng gi\u1edd \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 t\u00ecm ki\u1ebfm nguy\u00ean nh\u00e2n m\u01a1 h\u1ed3:<\/p>\n\n<div class=\"rich-checklist\">\n<p class=\"rich-checklist-title\"><span class=\"rich-checklist-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=\"M13 5h8\"\/><path d=\"M13 12h8\"\/><path d=\"M13 19h8\"\/><path d=\"m3 17 2 2 4-4\"\/><path d=\"m3 7 2 2 4-4\"\/><\/svg><\/span>Ch\u1ea9n \u0111o\u00e1n ba b\u01b0\u1edbc: ki\u1ec3m tra theo th\u1ee9 t\u1ef1 sau \u0111\u00e2y<\/p>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>1. L\u1edbp d\u00e2y d\u1eabn: c\u1ef1c t\u00ednh b\u1ecb \u0111\u1ea3o ng\u01b0\u1ee3c (d\u00e2y n\u00e2u v\u00e0 xanh d\u01b0\u01a1ng b\u1ecb ho\u00e1n \u0111\u1ed5i), d\u00e2y \u0111en n\u1ed1i v\u1edbi c\u1ef1c ph\u00e1t, d\u00e2y tr\u1eafng c\u1ee7a c\u00f4ng t\u1eafc ch\u1ecdn b\u00ean tr\u00e1i kh\u00f4ng \u0111\u01b0\u1ee3c n\u1ed1i, s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm QD sai, ho\u1eb7c d\u00f2ng t\u1ea3i v\u01b0\u1ee3t qu\u00e1 c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c \u0111\u1ea7u ra; h\u00e3y \u0111\u1ed1i chi\u1ebfu v\u1edbi s\u01a1 \u0111\u1ed3 trong b\u1ea3ng d\u1eef li\u1ec7u tr\u01b0\u1edbc m\u1eb7t b\u1ea1n<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>2. L\u1edbp logic: ch\u1ebf \u0111\u1ed9 \u201cs\u00e1ng khi c\u00f3 t\u00edn hi\u1ec7u\u201d ho\u1eb7c \u201ct\u1ed1i khi c\u00f3 t\u00edn hi\u1ec7u\u201d \u0111\u01b0\u1ee3c ch\u1ecdn ng\u01b0\u1ee3c l\u1ea1i so v\u1edbi c\u1ea5u tr\u00fac (xem b\u1ea3ng \u0111\u1ea3o ng\u01b0\u1ee3c \u1edf tr\u00ean), ho\u1eb7c ch\u01b0\u01a1ng tr\u00ecnh PLC ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u0111\u1ecdc t\u00edn hi\u1ec7u theo d\u1ea1ng \u0111\u1ea3o ng\u01b0\u1ee3c; h\u00e3y quan s\u00e1t \u0111\u00e8n LED c\u1ee7a ch\u00ednh c\u1ea3m bi\u1ebfn khi m\u1ed9t chi ti\u1ebft \u0111i qua \u0111\u1ec3 ph\u00e2n bi\u1ec7t logic c\u1ee7a c\u1ea3m bi\u1ebfn v\u1edbi logic c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh<\/p><\/div>\n<div class=\"rich-checklist-item\"><span class=\"rich-checklist-check\"><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><p>3. L\u1edbp v\u1eadt l\u00fd: ch\u00f9m tia b\u1ecb l\u1ec7ch h\u01b0\u1edbng, th\u1ea5u k\u00ednh b\u1ecb b\u00e1m b\u1ee5i, s\u01b0\u01a1ng d\u1ea7u, h\u01a1i n\u01b0\u1edbc ng\u01b0ng t\u1ee5 ho\u1eb7c m\u00e0ng x\u00e0 ph\u00f2ng (nguy\u00ean nh\u00e2n h\u00e0ng \u0111\u1ea7u d\u1eabn \u0111\u1ebfn suy gi\u1ea3m kh\u1ea3 n\u0103ng c\u1ea3m bi\u1ebfn quang h\u1ecdc), \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi ho\u1eb7c \u00e1nh s\u00e1ng m\u00f4i tr\u01b0\u1eddng m\u1ea1nh chi\u1ebfu v\u00e0o b\u1ed9 thu t\u1ea7m xa, ho\u1eb7c n\u1ec1n s\u00e1ng b\u00f3ng ph\u1ea3n x\u1ea1 xung quanh m\u1ee5c ti\u00eau m\u1edd; h\u00e3y l\u00e0m s\u1ea1ch th\u1ea5u k\u00ednh, \u0111i\u1ec1u ch\u1ec9nh l\u1ea1i h\u01b0\u1edbng c\u1ee7a c\u1eb7p thi\u1ebft b\u1ecb v\u00e0 ki\u1ec3m tra trong c\u1ea3 hai \u0111i\u1ec1u ki\u1ec7n \u00e1nh s\u00e1ng<\/p><\/div>\n<\/div>\n\n<p>V\u1eabn kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng sau khi th\u1eed c\u1ea3 ba c\u00e1ch? H\u00e3y \u0111o \u0111i\u1ec7n \u00e1p tr\u00ean d\u00e2y \u0111\u1ea7u ra so v\u1edbi 0 V trong khi b\u1ea1n ch\u1eb7n ch\u00f9m tia: n\u1ebfu \u0111i\u1ec7n \u00e1p kh\u00f4ng thay \u0111\u1ed5i, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf c\u1ea3m bi\u1ebfn ho\u1eb7c ngu\u1ed3n c\u1ea5p c\u1ee7a n\u00f3; n\u1ebfu \u0111i\u1ec7n \u00e1p thay \u0111\u1ed5i nh\u01b0ng PLC kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf \u0111o\u1ea1n d\u00e2y gi\u1eefa \u0111\u1ea7u ra v\u00e0 \u0111\u1ea7u v\u00e0o. S\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y s\u1ebd gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111o\u1ea1n d\u00e2y n\u00e0o c\u00f3 v\u1ea5n \u0111\u1ec1.<\/p>\n\n<h2>Nhu c\u1ea7u thay th\u1ebf c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i v\u00e0 nh\u00e0 b\u00e1n bu\u00f4n<\/h2>\n<p>T\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec1u n\u00eau tr\u00ean \u2013 vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac, quy t\u1eafc ti\u1ebfp nh\u1eadn, b\u1ea3ng chuy\u1ec3n \u0111\u1ed5i \u2013 ch\u00ednh l\u00e0 y\u1ebfu t\u1ed1 ph\u00e2n bi\u1ec7t gi\u1eefa m\u1ed9t nh\u00e0 ph\u00e2n ph\u1ed1i ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c c\u00e1c cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1i v\u00e0 m\u1ed9t nh\u00e0 ph\u00e2n ph\u1ed1i nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u01a1n \u0111\u1eb7t h\u00e0ng. Kh\u00e1ch h\u00e0ng c\u1ee7a b\u1ea1n m\u00f4 t\u1ea3 c\u1ea3m bi\u1ebfn quang theo c\u00e1ch h\u1ecd nh\u00ecn th\u1ea5y: \u201clo\u1ea1i c\u00f3 hai \u0111\u1ea7u\u201d, \u201clo\u1ea1i c\u00f3 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1\u201d, \u201clo\u1ea1i m\u1ed9t \u0111\u1ea7u c\u00f3 th\u1ec3 nh\u1eadn di\u1ec7n chai\u201d. Nh\u1eefng m\u00f4 t\u1ea3 n\u00e0y t\u01b0\u01a1ng \u1ee9ng m\u1ed9t-m\u1ed9t v\u1edbi ba c\u1ea5u tr\u00fac trong h\u01b0\u1edbng d\u1eabn n\u00e0y. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao ba c\u00e2u h\u1ecfi nh\u1eadn di\u1ec7n n\u00e0y c\u0169ng \u0111\u00f3ng vai tr\u00f2 nh\u01b0 k\u1ecbch b\u1ea3n ch\u0103m s\u00f3c kh\u00e1ch h\u00e0ng, v\u00e0 t\u1ea1i sao nh\u00e0 ph\u00e2n ph\u1ed1i c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi ch\u00fang trong m\u1ed9t cu\u1ed9c g\u1ecdi s\u1ebd gi\u00e0nh \u0111\u01b0\u1ee3c \u0111\u01a1n h\u00e0ng l\u1eb7p l\u1ea1i.<\/p>\n<p>C\u1ea5u tr\u00fac ti\u00eau chu\u1ea9n n\u00e0y gi\u00fap t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho v\u00e0 l\u1eadp b\u00e1o gi\u00e1. H\u00e3y qu\u1ea3n l\u00fd c\u00e1c c\u1eb7p c\u1ea3m bi\u1ebfn quang xuy\u00ean qua theo t\u1eebng c\u1eb7p, v\u00ec b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 thu th\u01b0\u1eddng h\u1ecfng h\u00f3c v\u00e0 \u0111\u01b0\u1ee3c thay th\u1ebf c\u00f9ng nhau. N\u00ean \u01b0u ti\u00ean s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb c\u00f3 logic c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn ho\u1eb7c logic b\u1ed5 sung khi ph\u00f9 h\u1ee3p: m\u1ed9t m\u00e3 SKU duy nh\u1ea5t c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng c\u1ea3 nhu c\u1ea7u \u201cb\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng\u201d v\u00e0 \u201cb\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng\u201d. L\u1eadp b\u00e1o gi\u00e1 cho m\u1ecdi \u0111\u01a1n h\u00e0ng b\u1eb1ng danh s\u00e1ch ki\u1ec3m tra s\u00e1u tr\u01b0\u1eddng: c\u1ea5u tr\u00fac, c\u1ef1c t\u00ednh, logic, ngu\u1ed3n c\u1ea5p\/d\u00e2y d\u1eabn, ph\u1ea1m vi, m\u00f4i tr\u01b0\u1eddng. \u0110\u1ed1i v\u1edbi c\u1ea3m bi\u1ebfn quang, c\u1ef1c t\u00ednh sai ho\u1eb7c logic b\u1ecb \u0111\u1ea3o ng\u01b0\u1ee3c s\u1ebd d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng \u201c\u0111\u00e3 nh\u1eadn h\u00e0ng nh\u01b0ng kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng\u201d v\u00e0 ph\u1ea3i tr\u1ea3 l\u1ea1i h\u00e0ng, v\u00e0 vi\u1ec7c tr\u1ea3 l\u1ea1i h\u00e0ng ch\u00ednh l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m gi\u1ea3m l\u1ee3i nhu\u1eadn. Kh\u00f4ng c\u00f3 g\u00ec l\u00e0 qu\u00e1 ph\u1ee9c t\u1ea1p c\u1ea3: \u0111\u00f3 ch\u00ednh l\u00e0 s\u01a1 \u0111\u1ed3 \u0111\u1ea5u d\u00e2y m\u00e0 b\u1ea1n \u0111\u00e3 bi\u1ebft, \u0111\u01b0\u1ee3c di\u1ec5n gi\u1ea3i l\u1ea1i th\u00e0nh ch\u00ednh s\u00e1ch qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho.<\/p>\n<p><em>N\u1ebfu qu\u00fd kh\u00e1ch \u0111ang thay th\u1ebf c\u00e1c c\u1ea3m bi\u1ebfn quang v\u00e0 mu\u1ed1n ki\u1ec3m tra th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt tr\u01b0\u1edbc khi quy\u1ebft \u0111\u1ecbnh, d\u00f9 l\u00e0 v\u1ec1 c\u1ea5u tr\u00fac, lo\u1ea1i t\u00edn hi\u1ec7u \u0111\u1ea7u ra, ch\u1ebf \u0111\u1ed9 k\u00edch ho\u1ea1t khi s\u00e1ng\/t\u1ed1i hay s\u01a1 \u0111\u1ed3 ch\u00e2n c\u1eafm, h\u00e3y g\u1eedi th\u00f4ng tin chi ti\u1ebft c\u1ee7a thi\u1ebft b\u1ecb c\u0169 \u0111\u1ebfn \u0111\u1ed9i ng\u0169 l\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m c\u1ee7a OMCH. Ch\u00fang t\u00f4i s\u1ebd \u0111\u1ed1i chi\u1ebfu v\u1edbi c\u00e1c b\u1ea3n v\u1ebd v\u00e0 b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt trong danh m\u1ee5c t\u1ef1 \u0111\u1ed9ng h\u00f3a v\u1edbi h\u01a1n 30 danh m\u1ee5c s\u1ea3n ph\u1ea9m c\u1ee7a ch\u00fang t\u00f4i, \u0111\u1ed3ng th\u1eddi s\u1ebd x\u00e1c nh\u1eadn m\u1eabu th\u1eed tr\u00ean m\u00e1y c\u1ee7a qu\u00fd kh\u00e1ch tr\u01b0\u1edbc khi qu\u00fd kh\u00e1ch \u0111\u1eb7t h\u00e0ng s\u1ed1 l\u01b0\u1ee3ng l\u1edbn.<\/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=\"M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z\"\/><polyline points=\"22,6 12,13 2,6\"\/><\/svg><\/span>Bi\u1ebfn c\u00e1c cu\u1ed9c g\u1ecdi y\u00eau c\u1ea7u thay th\u1ebf th\u00e0nh \u0111\u01a1n h\u00e0ng \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn<\/p>\n<p class=\"bp-cta-end-sub\">H\u00e3y g\u1eedi th\u00f4ng tin v\u1ec1 c\u1ea5u tr\u00fac, lo\u1ea1i \u0111\u1ea7u ra v\u00e0 logic \u201cs\u00e1ng khi b\u1eadt\/t\u1ed1i khi b\u1eadt\u201d m\u00e0 qu\u00fd kh\u00e1ch \u0111\u00e3 ghi nh\u1eadn t\u1eeb m\u00e1y \u2014 ho\u1eb7c h\u00ecnh \u1ea3nh v\u00e0 c\u00e1c d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft tr\u00ean thi\u1ebft b\u1ecb c\u0169 \u2014 \u0111\u1ec3 c\u00e1c k\u1ef9 s\u01b0 l\u1ef1a ch\u1ecdn c\u1ee7a ch\u00fang t\u00f4i ki\u1ec3m tra t\u00ednh t\u01b0\u01a1ng th\u00edch 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 \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra theo th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/a>\n<\/div>\n\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol class=\"bd-refs\">\n<li><a href=\"https:\/\/www.pepperl-fuchs.com\/en-us\/support\/knowledge-and-literature\/knowledge-bases-for-industrial-sensors\/knowledge-base-for-inductive-sensors\/sensor-versions\/connection-methods-gp28962\">Pepperl+Fuchs. \u201cC\u1ea3m bi\u1ebfn c\u1ea3m \u1ee9ng \u2013 K\u1ebft n\u1ed1i \u0111i\u1ec7n: M\u00e0u d\u00e2y v\u00e0 c\u00e1ch b\u1ed1 tr\u00ed ch\u00e2n c\u1eafm theo ti\u00eau chu\u1ea9n EN 60947-5-2.\u201d<\/a><\/li>\n<li><a href=\"https:\/\/www.ia.omron.com\/support\/guide\/43\/explanation_of_terms.html\">Omron Industrial Automation. \u201cC\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n \u2013 Gi\u1ea3i th\u00edch c\u00e1c thu\u1eadt ng\u1eef (Light-ON \/ Dark-ON).\u201d<\/a><\/li>\n<li><a href=\"https:\/\/www.balluff.com\/en-us\/blog\/photoelectric-basics-light-on-or-dark-on\">Balluff. \u201cKi\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n \u2013 Light-On ho\u1eb7c Dark-On.\u201d Th\u00e1ng 6 n\u0103m 2024.<\/a><\/li>\n<li><a href=\"https:\/\/www.realpars.com\/blog\/photoelectric-sensor-wiring\">RealPars. \u201cC\u00e1ch n\u1ed1i d\u00e2y, c\u00e0i \u0111\u1eb7t v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 cho c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n.\u201d<\/a><\/li>\n<li><a href=\"https:\/\/control.com\/technical-articles\/what-do-light-on-and-dark-on-mean-for-photoelectric-sensors\/\">control.com. \u201cLight-On v\u00e0 Dark-On c\u00f3 \u00fd ngh\u0129a g\u00ec \u0111\u1ed1i v\u1edbi c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n?\u201d Th\u00e1ng 1 n\u0103m 2025.<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/sensor-switches\/\">C\u00f4ng t\u1eafc c\u1ea3m bi\u1ebfn OMCH \u2013 D\u00f2ng s\u1ea3n ph\u1ea9m c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n v\u00e0 c\u1ea3m bi\u1ebfn ti\u1ec7m c\u1eadn<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/product-selection\/\">L\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m OMCH \u2013 Ph\u1ed1i h\u1ee3p d\u1ef1a tr\u00ean th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 b\u1ea3n v\u1ebd<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/contact\/\">Li\u00ean h\u1ec7 v\u1edbi OMCH<\/a><\/li>\n<li><a href=\"https:\/\/www.omch.com\/vi\/\">OMCH \u2013 Linh ki\u1ec7n t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p<\/a><\/li>\n<\/ol>\n<\/article>\n<\/div>\n\n<\/body><\/html>","protected":false},"excerpt":{"rendered":"<p>S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n: Lo\u1ea1i 3 d\u00e2y, 4 d\u00e2y v\u00e0 lo\u1ea1i xuy\u00ean ch\u00f9m (Gi\u1ea3i th\u00edch v\u1ec1 ch\u1ebf \u0111\u1ed9 b\u1eadt khi c\u00f3 \u00e1nh s\u00e1ng v\u00e0 b\u1eadt khi kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng) N\u1ebfu b\u1ea1n t\u1eebng \u0111\u1ee9ng tr\u01b0\u1edbc m\u1ed9t m\u00e1y m\u00f3c c\u00f3 c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n h\u1ecfng, c\u1ea7m tr\u00ean tay m\u1ed9t c\u1ea3m bi\u1ebfn thay th\u1ebf c\u00f3 nhi\u1ec1u d\u00e2y h\u01a1n c\u1ea3m bi\u1ebfn c\u0169, th\u00ec h\u01b0\u1edbng d\u1eabn n\u00e0y d\u00e0nh cho b\u1ea1n. S\u01a1 \u0111\u1ed3 n\u1ed1i d\u00e2y c\u1ea3m bi\u1ebfn quang \u0111i\u1ec7n tr\u00f4ng c\u00f3 v\u1ebb ph\u1ee9c t\u1ea1p v\u00ec c\u00f9ng ba ho\u1eb7c b\u1ed1n m\u00e0u d\u00e2y [\u2026]<\/p>","protected":false},"author":4,"featured_media":12215,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Photoelectric Sensor Wiring Diagram: PNP, NPN & More","_seopress_titles_desc":"Learn how to wire 3-wire, 4-wire and through-beam photoelectric sensors, match PNP\/NPN outputs and choose light-on or dark-on logic.","_seopress_robots_index":"","footnotes":""},"categories":[79],"tags":[],"class_list":["post-12220","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\/12220","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=12220"}],"version-history":[{"count":1,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12220\/revisions"}],"predecessor-version":[{"id":12223,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/posts\/12220\/revisions\/12223"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media\/12215"}],"wp:attachment":[{"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/media?parent=12220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/categories?post=12220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.omch.com\/vi\/wp-json\/wp\/v2\/tags?post=12220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}