{"id":30449,"date":"2026-07-27T15:52:32","date_gmt":"2026-07-27T07:52:32","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30449"},"modified":"2026-07-27T16:04:51","modified_gmt":"2026-07-27T08:04:51","slug":"remote-i-o-surge-protection-guide-for-industrial-automation","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/","title":{"rendered":"Remote I\/O Surge Protection Guide for Industrial Automation"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30449\" class=\"elementor elementor-30449\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f26f17b e-flex e-con-boxed e-con e-parent\" data-id=\"f26f17b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-586c83e elementor-widget elementor-widget-html\" data-id=\"586c83e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n#leeyee-remote-io-guide {\r\n  --rio-blue: #004898;\r\n  --rio-blue-dark: #00366f;\r\n  --rio-blue-soft: #eef5ff;\r\n  --rio-blue-pale: #f7fbff;\r\n  --rio-heading: #172738;\r\n  --rio-text: #2b3947;\r\n  --rio-muted: #5d6a77;\r\n  --rio-border: #d8e2eb;\r\n  --rio-warning: #8b4308;\r\n  --rio-warning-bg: #fff8ef;\r\n  --rio-success: #246543;\r\n  --rio-success-bg: #f1faf5;\r\n  width: 100%;\r\n  color: var(--rio-text);\r\n  font-size: 16.5px;\r\n  line-height: 1.72;\r\n  overflow-x: clip;\r\n  overflow-wrap: break-word;\r\n}\r\n\r\n#leeyee-remote-io-guide,\r\n#leeyee-remote-io-guide *,\r\n#leeyee-remote-io-guide *::before,\r\n#leeyee-remote-io-guide *::after {\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-content {\r\n  width: min(100%, 840px);\r\n  margin: 0 auto;\r\n}\r\n\r\n#leeyee-remote-io-guide p {\r\n  margin: 0 0 1.05em;\r\n}\r\n\r\n#leeyee-remote-io-guide a {\r\n  color: var(--rio-blue);\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n#leeyee-remote-io-guide a:hover {\r\n  color: var(--rio-blue-dark);\r\n}\r\n\r\n#leeyee-remote-io-guide strong {\r\n  color: var(--rio-heading);\r\n}\r\n\r\n#leeyee-remote-io-guide h2,\r\n#leeyee-remote-io-guide h3 {\r\n  color: var(--rio-heading);\r\n  line-height: 1.28;\r\n  letter-spacing: -0.015em;\r\n  scroll-margin-top: 90px;\r\n}\r\n\r\n#leeyee-remote-io-guide h2 {\r\n  margin: 2.35em 0 0.72em;\r\n  font-size: clamp(27px, 3.1vw, 32px);\r\n}\r\n\r\n#leeyee-remote-io-guide h3 {\r\n  margin: 1.7em 0 0.58em;\r\n  font-size: clamp(21px, 2.4vw, 24px);\r\n}\r\n\r\n#leeyee-remote-io-guide ul,\r\n#leeyee-remote-io-guide ol {\r\n  margin: 0.4em 0 1.15em;\r\n  padding-left: 1.35em;\r\n}\r\n\r\n#leeyee-remote-io-guide li {\r\n  margin: 0.4em 0;\r\n}\r\n\r\n#leeyee-remote-io-guide sup {\r\n  line-height: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide sup a {\r\n  font-size: 11.5px;\r\n  font-weight: 700;\r\n  text-decoration: none;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-intro {\r\n  margin-bottom: 1em;\r\n  color: #354657;\r\n  font-size: 17.5px;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-quick-answer {\r\n  margin: 1.35em 0 1.25em;\r\n  padding: 21px 23px;\r\n  border-left: 4px solid var(--rio-blue);\r\n  border-radius: 7px;\r\n  background: var(--rio-blue-pale);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-quick-answer h2 {\r\n  margin: 0 0 0.45em;\r\n  font-size: 23px;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-quick-answer p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-answer-lead {\r\n  font-size: 18px;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-light-note {\r\n  margin: -0.1em 0 1.5em;\r\n  color: var(--rio-muted);\r\n  font-size: 15.5px;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-guide-map {\r\n  margin: 1.3em 0 1.9em;\r\n  padding: 18px 20px;\r\n  border: 1px solid var(--rio-border);\r\n  border-radius: 7px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-guide-map-title {\r\n  margin: 0 0 0.65em;\r\n  color: var(--rio-heading);\r\n  font-size: 18px;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-guide-map ul {\r\n  columns: 2;\r\n  column-gap: 34px;\r\n  margin-bottom: 0;\r\n  padding-left: 1.15em;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-guide-map li {\r\n  break-inside: avoid;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-figure {\r\n  width: min(100%, 760px);\r\n  margin: 1.45em auto 1.65em;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  height: auto;\r\n  border: 1px solid var(--rio-border);\r\n  border-radius: 7px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-figure figcaption {\r\n  margin-top: 9px;\r\n  color: var(--rio-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-table-intro {\r\n  margin-bottom: 0.7em;\r\n  color: var(--rio-muted);\r\n  font-size: 15px;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-table-wrap {\r\n  width: 100%;\r\n  margin: 0.95em 0 1.4em;\r\n  overflow-x: auto;\r\n  border: 1px solid var(--rio-border);\r\n  border-radius: 7px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-remote-io-guide table {\r\n  width: 100%;\r\n  border-collapse: collapse;\r\n  border-spacing: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide th,\r\n#leeyee-remote-io-guide td {\r\n  padding: 12px 13px;\r\n  border-right: 1px solid var(--rio-border);\r\n  border-bottom: 1px solid var(--rio-border);\r\n  text-align: left;\r\n  vertical-align: top;\r\n}\r\n\r\n#leeyee-remote-io-guide th:last-child,\r\n#leeyee-remote-io-guide td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide tbody tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide th {\r\n  background: var(--rio-blue);\r\n  color: #fff;\r\n  font-size: 14.5px;\r\n  line-height: 1.4;\r\n}\r\n\r\n#leeyee-remote-io-guide td {\r\n  font-size: 15.25px;\r\n  line-height: 1.55;\r\n}\r\n\r\n#leeyee-remote-io-guide tbody tr:nth-child(even) {\r\n  background: #fbfdff;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-table-conclusion {\r\n  margin: -0.45em 0 1.45em;\r\n  color: #394a59;\r\n  font-size: 15.5px;\r\n  font-weight: 650;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-callout {\r\n  margin: 1.2em 0 1.5em;\r\n  padding: 17px 19px;\r\n  border-radius: 7px;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-callout p:last-child,\r\n#leeyee-remote-io-guide .rio-callout ul:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-engineering {\r\n  border: 1px solid #bfd3e7;\r\n  background: var(--rio-blue-pale);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-warning {\r\n  border: 1px solid #edcfb2;\r\n  background: var(--rio-warning-bg);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-warning strong {\r\n  color: var(--rio-warning);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-safe {\r\n  border: 1px solid #c8e3d4;\r\n  background: var(--rio-success-bg);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-callout-label {\r\n  display: block;\r\n  margin-bottom: 0.3em;\r\n  color: var(--rio-blue);\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n  letter-spacing: 0.055em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-path-list,\r\n#leeyee-remote-io-guide .rio-review-steps {\r\n  margin: 0.9em 0 1.5em;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: rio-step;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-path-list li,\r\n#leeyee-remote-io-guide .rio-review-steps li {\r\n  position: relative;\r\n  margin: 0;\r\n  padding: 14px 0 14px 47px;\r\n  border-bottom: 1px solid var(--rio-border);\r\n  counter-increment: rio-step;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-path-list li:last-child,\r\n#leeyee-remote-io-guide .rio-review-steps li:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-path-list li::before,\r\n#leeyee-remote-io-guide .rio-review-steps li::before {\r\n  position: absolute;\r\n  top: 12px;\r\n  left: 0;\r\n  width: 31px;\r\n  height: 31px;\r\n  border-radius: 50%;\r\n  background: var(--rio-blue);\r\n  color: #fff;\r\n  content: counter(rio-step);\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n  line-height: 31px;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-evidence {\r\n  margin: 1.25em 0 1.6em;\r\n  padding: 19px 21px;\r\n  border: 1px solid var(--rio-border);\r\n  border-radius: 8px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-evidence h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-spec-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(3, minmax(0, 1fr));\r\n  gap: 10px;\r\n  margin: 1em 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-spec-item {\r\n  padding: 12px;\r\n  border: 1px solid var(--rio-border);\r\n  border-radius: 6px;\r\n  background: var(--rio-blue-pale);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-spec-label {\r\n  display: block;\r\n  margin-bottom: 3px;\r\n  color: var(--rio-muted);\r\n  font-size: 12.5px;\r\n  font-weight: 700;\r\n  line-height: 1.4;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-spec-value {\r\n  display: block;\r\n  color: var(--rio-heading);\r\n  font-size: 15px;\r\n  font-weight: 750;\r\n  line-height: 1.42;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-scenario {\r\n  margin: 0.9em 0;\r\n  padding-bottom: 0.95em;\r\n  border-bottom: 1px solid var(--rio-border);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-scenario:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-scenario h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-checklist {\r\n  margin: 1.05em 0 1.45em;\r\n  padding: 19px 21px;\r\n  border: 1px solid #bfd3e7;\r\n  border-radius: 7px;\r\n  background: var(--rio-blue-pale);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-checklist ul {\r\n  columns: 2;\r\n  column-gap: 34px;\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-checklist li {\r\n  break-inside: avoid;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-cta {\r\n  margin: 1.4em 0 1.9em;\r\n  padding: 21px 23px;\r\n  border: 1px solid #bfd2e4;\r\n  border-radius: 8px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-cta h2 {\r\n  margin: 0 0 0.42em;\r\n  font-size: 24px;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-cta p {\r\n  margin-bottom: 1em;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-cta .leeyee-site-popup-btn {\r\n  display: inline-flex;\r\n  align-items: center;\r\n  justify-content: center;\r\n  min-height: 44px;\r\n  padding: 10px 18px;\r\n  border-radius: 5px;\r\n  background: var(--rio-blue);\r\n  color: #fff;\r\n  font-weight: 700;\r\n  line-height: 1.35;\r\n  text-decoration: none;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-cta .leeyee-site-popup-btn:hover {\r\n  background: var(--rio-blue-dark);\r\n  color: #fff;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-cta .leeyee-site-popup-btn span {\r\n  color: #fff;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-faq {\r\n  margin: 0.7em 0 1.3em;\r\n  border-top: 1px solid var(--rio-border);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-faq details {\r\n  border-bottom: 1px solid var(--rio-border);\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-faq summary {\r\n  position: relative;\r\n  padding: 16px 40px 16px 0;\r\n  color: var(--rio-heading);\r\n  font-weight: 700;\r\n  cursor: pointer;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-faq summary::-webkit-details-marker {\r\n  display: none;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-faq summary::after {\r\n  position: absolute;\r\n  top: 14px;\r\n  right: 4px;\r\n  color: var(--rio-blue);\r\n  content: \"+\";\r\n  font-size: 25px;\r\n  font-weight: 400;\r\n  line-height: 1;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-faq details[open] summary::after {\r\n  content: \"\u2212\";\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-faq-answer {\r\n  padding: 0 22px 15px 0;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-related {\r\n  margin: 0.9em 0 1.5em;\r\n  padding-left: 1.2em;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-references {\r\n  margin: 0.9em 0 0;\r\n  padding-left: 1.25em;\r\n  color: #4c5a68;\r\n  font-size: 14.5px;\r\n  line-height: 1.62;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-references li {\r\n  margin-bottom: 0.78em;\r\n}\r\n\r\n#leeyee-remote-io-guide .rio-references a {\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n@media (max-width: 1024px) {\r\n  #leeyee-remote-io-guide .rio-content {\r\n    width: min(100%, 820px);\r\n  }\r\n}\r\n\r\n@media (max-width: 912px) {\r\n  #leeyee-remote-io-guide .rio-content {\r\n    width: min(100%, 800px);\r\n  }\r\n\r\n  #leeyee-remote-io-guide .rio-spec-grid {\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  }\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  #leeyee-remote-io-guide {\r\n    font-size: 16px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  #leeyee-remote-io-guide .rio-intro {\r\n    font-size: 16.75px;\r\n  }\r\n\r\n  #leeyee-remote-io-guide h2 {\r\n    margin-top: 2em;\r\n  }\r\n\r\n  #leeyee-remote-io-guide .rio-quick-answer,\r\n  #leeyee-remote-io-guide .rio-guide-map,\r\n  #leeyee-remote-io-guide .rio-checklist,\r\n  #leeyee-remote-io-guide .rio-cta,\r\n  #leeyee-remote-io-guide .rio-evidence {\r\n    padding: 17px;\r\n  }\r\n\r\n  #leeyee-remote-io-guide .rio-guide-map ul,\r\n  #leeyee-remote-io-guide .rio-checklist ul {\r\n    columns: 1;\r\n  }\r\n\r\n  #leeyee-remote-io-guide .rio-table-wrap {\r\n    overflow: visible;\r\n    border: 0;\r\n    border-radius: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  #leeyee-remote-io-guide table,\r\n  #leeyee-remote-io-guide tbody,\r\n  #leeyee-remote-io-guide tr,\r\n  #leeyee-remote-io-guide td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  #leeyee-remote-io-guide thead {\r\n    display: none;\r\n  }\r\n\r\n  #leeyee-remote-io-guide tbody tr {\r\n    margin: 0 0 13px;\r\n    padding: 5px 14px;\r\n    border: 1px solid var(--rio-border);\r\n    border-radius: 7px;\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-remote-io-guide tbody tr:nth-child(even) {\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-remote-io-guide td {\r\n    position: relative;\r\n    min-height: 41px;\r\n    padding: 9px 0 9px 43%;\r\n    border-right: 0;\r\n    border-bottom: 1px solid #e7edf3;\r\n  }\r\n\r\n  #leeyee-remote-io-guide td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  #leeyee-remote-io-guide td::before {\r\n    position: absolute;\r\n    top: 9px;\r\n    left: 0;\r\n    width: 39%;\r\n    color: var(--rio-blue-dark);\r\n    content: attr(data-label);\r\n    font-size: 13.25px;\r\n    font-weight: 750;\r\n    line-height: 1.4;\r\n  }\r\n}\r\n\r\n@media (max-width: 540px) {\r\n  #leeyee-remote-io-guide .rio-spec-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  #leeyee-remote-io-guide h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  #leeyee-remote-io-guide h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  #leeyee-remote-io-guide .rio-quick-answer h2,\r\n  #leeyee-remote-io-guide .rio-cta h2 {\r\n    font-size: 22px;\r\n  }\r\n\r\n  #leeyee-remote-io-guide td {\r\n    padding-left: 0;\r\n  }\r\n\r\n  #leeyee-remote-io-guide td::before {\r\n    position: static;\r\n    display: block;\r\n    width: auto;\r\n    margin-bottom: 3px;\r\n  }\r\n\r\n  #leeyee-remote-io-guide .rio-cta .leeyee-site-popup-btn {\r\n    width: 100%;\r\n    text-align: center;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-remote-io-guide\">\r\n  <div class=\"rio-content\">\r\n\r\n    <p class=\"rio-intro\">\r\n      A remote I\/O station, also called a distributed I\/O station or field I\/O node, places input and output modules close to sensors and actuators. It then connects the station to a PLC, DCS or industrial controller through a communication network.\r\n    <\/p>\r\n\r\n    <p class=\"rio-intro\">\r\n      This architecture reduces field cabling, but it also puts sensitive electronics beside local 24V power, long instrument cables and exposed copper communication links. The protection question is therefore not simply whether the PLC has an SPD. It is whether each conductive path entering the remote I\/O station has been reviewed.\r\n    <\/p>\r\n\r\n    <section class=\"rio-quick-answer\" aria-labelledby=\"rio-quick-answer-title\">\r\n      <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#quick-answer\" >Quick Answer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#when-does-a-remote-io-station-need-surge-protection\" >When Does a Remote I\/O Station Need Surge Protection?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#treat-the-remote-io-station-as-three-protection-paths\" >Treat the Remote I\/O Station as Three Protection Paths<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#use-a-station-level-review-instead-of-a-channel-only-review\" >Use a Station-Level Review Instead of a Channel-Only Review<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#how-should-the-24v-dc-supply-be-reviewed\" >How Should the 24V DC Supply Be Reviewed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#how-do-di-do-ai-and-ao-affect-the-station-plan\" >How Do DI, DO, AI and AO Affect the Station Plan?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#how-should-the-communication-backhaul-be-protected\" >How Should the Communication Backhaul Be Protected?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#how-do-0v-shield-functional-earth-and-pe-affect-the-design\" >How Do 0V, Shield, Functional Earth and PE Affect the Design?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#where-should-remote-io-spds-be-installed\" >Where Should Remote I\/O SPDs Be Installed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#build-a-remote-io-station-protection-schedule\" >Build a Remote I\/O Station Protection Schedule<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#remote-io-spd-project-approval-matrix\" >Remote I\/O SPD Project Approval Matrix<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#where-a-leeyee-signal-spd-may-fit%e2%80%94and-where-it-does-not\" >Where a LEEYEE Signal SPD May Fit\u2014and Where It Does Not<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#typical-remote-io-protection-scenarios\" >Typical Remote I\/O Protection Scenarios<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#common-remote-io-protection-mistakes\" >Common Remote I\/O Protection Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#before-ordering-a-remote-io-protection-solution\" >Before Ordering a Remote I\/O Protection Solution<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#need-a-remote-io-station-protection-review\" >Need a Remote I\/O Station Protection Review?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#remote-io-surge-protection-faq\" >Remote I\/O Surge Protection FAQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#related-technical-guides\" >Related Technical Guides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"rio-quick-answer-title\"><span class=\"ez-toc-section\" id=\"quick-answer\"><\/span>Quick Answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"rio-answer-lead\">\r\n        <strong>A remote I\/O station does not automatically need an SPD on every channel.<\/strong>\r\n      <\/p>\r\n\r\n      <p>\r\n        Surge protection should be evaluated when the station connects to outdoor equipment, long field cables, inter-building conductors, separate earthing zones or exposed RS485 and Ethernet links.\r\n      <\/p>\r\n\r\n      <p>\r\n        Review the station as three separate paths:\r\n        <strong>24V DC power, field I\/O and communication backhaul.<\/strong>\r\n        Select and position protection for each path according to its real voltage, current, signal characteristics, isolation arrangement, cable exposure and grounding design.<sup><a href=\"#rio-ref-1\">[1]<\/a><\/sup><sup><a href=\"#rio-ref-2\">[2]<\/a><\/sup><sup><a href=\"#rio-ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <p class=\"rio-light-note\">\r\n      Equipment surge-immunity testing and field SPD design are related but different. IEC 61000-4-5 defines a repeatable equipment immunity test. It does not by itself approve every completed installation, cable route or earthing arrangement.<sup><a href=\"#rio-ref-4\">[4]<\/a><\/sup>\r\n    <\/p>\r\n\r\n    <div class=\"rio-guide-map\">\r\n      <p class=\"rio-guide-map-title\">Key Decisions Covered<\/p>\r\n      <ul>\r\n        <li>When a remote I\/O station needs protection<\/li>\r\n        <li>How to divide the station into three surge paths<\/li>\r\n        <li>How local and central 24V supplies differ<\/li>\r\n        <li>How DI, DO, AI and AO affect selection<\/li>\r\n        <li>How RS485, Ethernet and fibre change the design<\/li>\r\n        <li>Where to install SPDs at each station boundary<\/li>\r\n        <li>How to prepare a station-level protection schedule<\/li>\r\n        <li>What evidence an OEM buyer should approve<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <section aria-labelledby=\"rio-need-title\">\r\n      <h2 id=\"rio-need-title\"><span class=\"ez-toc-section\" id=\"when-does-a-remote-io-station-need-surge-protection\"><\/span>When Does a Remote I\/O Station Need Surge Protection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The decision should begin with cable exposure, not only with the remote I\/O brand, module type or total channel count.\r\n      <\/p>\r\n\r\n      <p>\r\n        Distributed I\/O systems collect signals near the process and transmit them to a central controller. The remote station may therefore be installed in a machine enclosure, outdoor cabinet, pump station, conveyor section, packaged skid or separate building.<sup><a href=\"#rio-ref-5\">[5]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <p class=\"rio-table-intro\">\r\n        Use the cable route and electrical boundary to decide which paths need a detailed review.\r\n      <\/p>\r\n\r\n      <div class=\"rio-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Installation condition<\/th>\r\n              <th>Likely exposure<\/th>\r\n              <th>Engineering response<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td data-label=\"Condition\"><strong>All wiring stays inside one bonded enclosure<\/strong><\/td>\r\n              <td data-label=\"Exposure\">Lower external lightning exposure, although load switching and internal disturbances may still occur.<\/td>\r\n              <td data-label=\"Response\">Review equipment immunity, cabinet power protection and load suppression before adding channel SPDs.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Condition\"><strong>Long field cables leave the station<\/strong><\/td>\r\n              <td data-label=\"Exposure\">Transient voltage may be coupled onto instrument or control conductors.<\/td>\r\n              <td data-label=\"Response\">Evaluate signal protection at the station cable-entry boundary.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Condition\"><strong>Outdoor sensors or actuators<\/strong><\/td>\r\n              <td data-label=\"Exposure\">Field wiring may be affected by induced overvoltage and local earth-potential differences.<\/td>\r\n              <td data-label=\"Response\">Evaluate coordinated station-side and field-side protection.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Condition\"><strong>Copper cable crosses buildings<\/strong><\/td>\r\n              <td data-label=\"Exposure\">The two cable ends may be connected to separate equipotential zones.<\/td>\r\n              <td data-label=\"Response\">Review both ends, bonding, shielding and the option of fibre communication.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Condition\"><strong>Outdoor or unmanned remote cabinet<\/strong><\/td>\r\n              <td data-label=\"Exposure\">Power, I\/O and communication cables may all enter through exposed routes.<\/td>\r\n              <td data-label=\"Response\">Assess every incoming copper path and define inspection and replacement procedures.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p class=\"rio-table-conclusion\">\r\n        Buyer meaning: do not begin by asking how many SPDs are needed. Begin by identifying which conductors cross an equipment, building, earthing or lightning-protection boundary.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-architecture-title\">\r\n      <h2 id=\"rio-architecture-title\"><span class=\"ez-toc-section\" id=\"treat-the-remote-io-station-as-three-protection-paths\"><\/span>Treat the Remote I\/O Station as Three Protection Paths<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A remote I\/O station is one physical assembly, but it is not one electrical circuit. It normally combines a DC power system, several field-interface groups and at least one communication interface.\r\n      <\/p>\r\n\r\n      <p>\r\n        IEC 61643-21 covers SPDs connected to telecommunications and signalling networks. IEC 61643-22 covers their selection, operation, location and coordination. IEC 61643-21:2025 also includes networks that carry power on the same line, including Power over Ethernet.<sup><a href=\"#rio-ref-1\">[1]<\/a><\/sup><sup><a href=\"#rio-ref-2\">[2]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <figure class=\"rio-figure\">\r\n        <img fetchpriority=\"high\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/remote-io-surge-protection-architecture.webp\"\r\n          alt=\"Remote I\/O surge protection architecture for 24V DC power, field I\/O and industrial communication\"\r\n          width=\"1448\"\r\n          height=\"1086\"\r\n          loading=\"eager\"\r\n          decoding=\"async\"\r\n          fetchpriority=\"high\">\r\n        <figcaption>\r\n          Remote I\/O station protection architecture. Power, field I\/O and communication are reviewed as independent conductive paths before a station-level protection plan is approved.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"rio-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Protection path<\/th>\r\n              <th>Typical conductors<\/th>\r\n              <th>Selection factors<\/th>\r\n              <th>Main mistake<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td data-label=\"Path\"><strong>24V DC power<\/strong><\/td>\r\n              <td data-label=\"Conductors\">L+, M or 0V, local power supply and auxiliary DC feeder.<\/td>\r\n              <td data-label=\"Factors\">Maximum operating voltage, current, polarity, grounding arrangement and protection level.<\/td>\r\n              <td data-label=\"Mistake\">Choosing a device only because the system is described as \u201c24V.\u201d<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Path\"><strong>Field I\/O<\/strong><\/td>\r\n              <td data-label=\"Conductors\">DI, DO, AI, AO, sensor, transmitter, relay, valve and actuator circuits.<\/td>\r\n              <td data-label=\"Factors\">Signal type, current, leakage, resistance, capacitance, bandwidth and common arrangement.<\/td>\r\n              <td data-label=\"Mistake\">Using one signal SPD specification for every channel type.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Path\"><strong>Communication backhaul<\/strong><\/td>\r\n              <td data-label=\"Conductors\">RS485, Modbus RTU, PROFIBUS, CAN, industrial Ethernet, PROFINET or PoE.<\/td>\r\n              <td data-label=\"Factors\">Protocol, conductor arrangement, impedance, data rate, shield, connector and PoE requirement.<\/td>\r\n              <td data-label=\"Mistake\">Using a power or low-speed signal SPD on a high-speed network.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"rio-callout rio-engineering\">\r\n        <span class=\"rio-callout-label\">Station-level meaning<\/span>\r\n        <p>\r\n          Protecting the AC input of the main control cabinet does not automatically protect the remote I\/O station. Surge energy may still reach the station through its local DC supply, field cables or copper backhaul.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-review-title\">\r\n      <h2 id=\"rio-review-title\"><span class=\"ez-toc-section\" id=\"use-a-station-level-review-instead-of-a-channel-only-review\"><\/span>Use a Station-Level Review Instead of a Channel-Only Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A channel-only review asks whether a DI, AO or RS485 port needs an SPD. A station-level review asks where the surge can enter, which modules share a potential group and which equipment remains exposed at the opposite cable end.\r\n      <\/p>\r\n\r\n      <ol class=\"rio-review-steps\">\r\n        <li>\r\n          <strong>Map every incoming and outgoing conductor.<\/strong><br>\r\n          Include power, I\/O, communication, shield, drain and auxiliary conductors.\r\n        <\/li>\r\n        <li>\r\n          <strong>Identify the station power architecture.<\/strong><br>\r\n          Confirm whether the station uses a local DC supply or receives 24V from the central cabinet.\r\n        <\/li>\r\n        <li>\r\n          <strong>Group channels by electrical behaviour.<\/strong><br>\r\n          Do not group circuits only because they are installed in the same I\/O module.\r\n        <\/li>\r\n        <li>\r\n          <strong>Mark isolation and potential-group boundaries.<\/strong><br>\r\n          Confirm which channels share 0V and which interfaces are galvanically isolated.\r\n        <\/li>\r\n        <li>\r\n          <strong>Define the protection boundary.<\/strong><br>\r\n          Decide where unprotected field wiring ends and protected station wiring begins.\r\n        <\/li>\r\n        <li>\r\n          <strong>Prepare a protection schedule.<\/strong><br>\r\n          Record the SPD type, circuit, quantity, installation point and evidence required for approval.\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <p>\r\n        Detailed signal-circuit selection remains important, but the purpose of this page is the complete remote I\/O station. For deeper DI, DO, AI and AO circuit guidance, see the\r\n        <a href=\"https:\/\/www.cnspd.com\/plc-io-signal-surge-protection\/\">PLC I\/O signal surge protection guide<\/a>.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-power-title\">\r\n      <h2 id=\"rio-power-title\"><span class=\"ez-toc-section\" id=\"how-should-the-24v-dc-supply-be-reviewed\"><\/span>How Should the 24V DC Supply Be Reviewed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The first question is whether the remote I\/O station receives 24V from the main cabinet or generates it locally.\r\n      <\/p>\r\n\r\n      <h3>Central 24V DC Feeder<\/h3>\r\n\r\n      <p>\r\n        A central feeder may run beside field or power cables for a considerable distance. The remote I\/O power input can therefore be exposed even when the upstream AC supply has already been protected.\r\n      <\/p>\r\n\r\n      <p>\r\n        Review the cable route, conductor length, load current, voltage drop and the protection required at the remote station entrance.\r\n      <\/p>\r\n\r\n      <h3>Local 24V DC Power Supply<\/h3>\r\n\r\n      <p>\r\n        A locally installed AC\/DC power supply changes the path. The project must assess the local AC input, the DC output feeding the remote I\/O modules and any long 24V circuits leaving the enclosure.\r\n      <\/p>\r\n\r\n      <p>\r\n        An AC SPD at the local cabinet entrance does not automatically protect all downstream signal and communication paths.\r\n      <\/p>\r\n\r\n      <p>\r\n        Before fixing a DC SPD model, confirm:\r\n      <\/p>\r\n\r\n      <ul>\r\n        <li>The nominal and maximum operating voltage, including tolerance and ripple.<\/li>\r\n        <li>Whether the circuit is grounded, floating, SELV, PELV or part of another defined arrangement.<\/li>\r\n        <li>The station current and any current supplied to field loads.<\/li>\r\n        <li>The required protection modes between conductors and toward PE.<\/li>\r\n        <li>The remote I\/O manufacturer\u2019s permitted supply and insulation arrangement.<\/li>\r\n        <li>The acceptable residual voltage for the connected power and interface modules.<\/li>\r\n      <\/ul>\r\n\r\n      <div class=\"rio-callout rio-warning\">\r\n        <strong>Do not treat 24V power and 24V signal as the same application.<\/strong>\r\n        <p>\r\n          A DC feeder may carry the combined current of the station and field loads. A 24V signal channel may carry only a small sensing or control current. Their series-current capability, resistance, terminals and protection behaviour can be different.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-channel-title\">\r\n      <h2 id=\"rio-channel-title\"><span class=\"ez-toc-section\" id=\"how-do-di-do-ai-and-ao-affect-the-station-plan\"><\/span>How Do DI, DO, AI and AO Affect the Station Plan?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The station plan should group channels by electrical behaviour. It should not assume that every module labelled DI, DO, AI or AO uses the same circuit arrangement.\r\n      <\/p>\r\n\r\n      <p>\r\n        Texas Instruments distinguishes the protection needs of high-impedance inputs and low-impedance outputs. Its I\/O protection guidance also notes that protective-device leakage can affect analogue measurement circuits.<sup><a href=\"#rio-ref-6\">[6]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <p class=\"rio-table-intro\">\r\n        Use this table to decide which channel groups can be reviewed together.\r\n      <\/p>\r\n\r\n      <div class=\"rio-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Channel group<\/th>\r\n              <th>Confirm for the station schedule<\/th>\r\n              <th>Main compatibility risk<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td data-label=\"Channel group\"><strong>DI<\/strong><\/td>\r\n              <td data-label=\"Confirm\">Dry contact or powered sensor, PNP\/NPN logic, voltage, common terminal and conductor count.<\/td>\r\n              <td data-label=\"Risk\">Leakage or an incorrect reference connection may produce a false input state.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Channel group\"><strong>DO<\/strong><\/td>\r\n              <td data-label=\"Confirm\">Transistor or relay output, continuous current, inrush current, inductive load and local suppression.<\/td>\r\n              <td data-label=\"Risk\">Excess resistance or insufficient current capability may disturb the load.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Channel group\"><strong>AI<\/strong><\/td>\r\n              <td data-label=\"Confirm\">4\u201320mA, 0\u201310V, RTD or thermocouple, loop topology, leakage limit and allowable resistance.<\/td>\r\n              <td data-label=\"Risk\">Leakage or added resistance may create measurement error.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Channel group\"><strong>AO<\/strong><\/td>\r\n              <td data-label=\"Confirm\">Active or passive output, output range, load resistance, shared reference and allowable voltage drop.<\/td>\r\n              <td data-label=\"Risk\">Incorrect clamping or series characteristics may limit the control output.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Channel group\"><strong>Pulse or high-speed input<\/strong><\/td>\r\n              <td data-label=\"Confirm\">Signal amplitude, maximum frequency, edge rate, capacitance and insertion loss.<\/td>\r\n              <td data-label=\"Risk\">An unsuitable SPD may distort the signal or cause missed pulses.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <figure class=\"rio-figure\">\r\n        <img loading=\"lazy\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/remote-io-di-do-ai-ao-spd-selection-comparison.webp\"\r\n          alt=\"DI DO AI AO surge protector selection comparison for remote I\/O systems\"\r\n          width=\"1448\"\r\n          height=\"1086\"\r\n          loading=\"lazy\"\r\n          decoding=\"async\">\r\n        <figcaption>\r\n          Remote I\/O channel comparison. Channels should be grouped by real electrical characteristics, not only by the module name or total channel count.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"rio-callout rio-warning\">\r\n        <span class=\"rio-callout-label\">Project confirmation required<\/span>\r\n        <p>\r\n          Fail-safe I\/O, intrinsically safe loops, hazardous-area circuits and safety instrumented functions require model-specific approval. Do not add or substitute an SPD without checking the remote I\/O manual, functional-safety documentation and applicable hazardous-area requirements.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-network-title\">\r\n      <h2 id=\"rio-network-title\"><span class=\"ez-toc-section\" id=\"how-should-the-communication-backhaul-be-protected\"><\/span>How Should the Communication Backhaul Be Protected?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The backhaul connects the remote station to a controller, gateway or industrial switch. It can also create a conductive connection between separate equipment zones.\r\n      <\/p>\r\n\r\n      <h3>RS485, Modbus RTU and Similar Serial Networks<\/h3>\r\n\r\n      <p>\r\n        Confirm the A\/B conductor arrangement, signal reference, operating voltage, data rate, cable impedance, shield connection and network topology.\r\n      <\/p>\r\n\r\n      <p>\r\n        A general 24V power SPD should not be assumed suitable for RS485. Dedicated signal devices are designed around the interface circuit, current, capacitance, insertion loss and transmission requirement.<sup><a href=\"#rio-ref-7\">[7]<\/a><\/sup><sup><a href=\"#rio-ref-8\">[8]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <h3>Industrial Ethernet and PoE<\/h3>\r\n\r\n      <p>\r\n        Confirm the Ethernet category, transmission rate, connector, cable shielding and PoE requirement. The SPD must preserve the normal network performance and conductor arrangement.\r\n      <\/p>\r\n\r\n      <p>\r\n        IEC 61643-21:2025 includes telecommunications and signalling networks that may also provide power on the same line, including PoE.<sup><a href=\"#rio-ref-1\">[1]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <h3>Fibre Backhaul<\/h3>\r\n\r\n      <p>\r\n        Fibre removes the conductive surge path from the data link itself. It does not remove the need to review the remote station\u2019s DC supply, media-converter power and copper field circuits.\r\n      <\/p>\r\n\r\n      <div class=\"rio-callout rio-safe\">\r\n        <span class=\"rio-callout-label\">Engineering option<\/span>\r\n        <p>\r\n          For communication between buildings or widely separated earthing zones, fibre can simplify the backhaul protection problem. The final choice must still consider availability, redundancy, converter power and project communication requirements.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-grounding-title\">\r\n      <h2 id=\"rio-grounding-title\"><span class=\"ez-toc-section\" id=\"how-do-0v-shield-functional-earth-and-pe-affect-the-design\"><\/span>How Do 0V, Shield, Functional Earth and PE Affect the Design?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The word \u201cground\u201d is often used too broadly in automation drawings. A remote I\/O system may contain a DC return, signal reference, protective earth, functional earth and cable shield. These conductors do not automatically have the same function.\r\n      <\/p>\r\n\r\n      <p>\r\n        The remote I\/O manufacturer\u2019s documentation should identify grounded or ungrounded reference potentials, galvanic isolation and potential groups. The selected SPD circuit must remain compatible with that arrangement.<sup><a href=\"#rio-ref-5\">[5]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <ul>\r\n        <li><strong>L+:<\/strong> positive DC supply conductor.<\/li>\r\n        <li><strong>M or 0V:<\/strong> power return or signal reference defined by the equipment design.<\/li>\r\n        <li><strong>PE:<\/strong> protective earth and a possible surge-discharge reference.<\/li>\r\n        <li><strong>Functional earth:<\/strong> an EMC reference with a specific equipment function.<\/li>\r\n        <li><strong>Cable shield:<\/strong> a screen bonded according to the project EMC and earthing concept.<\/li>\r\n      <\/ul>\r\n\r\n      <p>\r\n        Do not connect 0V, shield and PE together merely because they are physically close inside the enclosure. An incorrect connection can bypass intended isolation, create circulating current or direct transient energy through a communication interface.\r\n      <\/p>\r\n\r\n      <div class=\"rio-callout rio-engineering\">\r\n        <span class=\"rio-callout-label\">Documents to review<\/span>\r\n        <p>\r\n          Request a wiring diagram showing the potential groups, isolation boundaries, shield terminations and PE arrangement. A device may have the correct voltage rating but the wrong protection circuit for the station topology.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-installation-title\">\r\n      <h2 id=\"rio-installation-title\"><span class=\"ez-toc-section\" id=\"where-should-remote-io-spds-be-installed\"><\/span>Where Should Remote I\/O SPDs Be Installed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        IEC 61643-22 addresses the selection, location and coordination of SPDs connected to signalling networks. IEC 62305-4 addresses surge protection measures for electrical and electronic systems within structures.<sup><a href=\"#rio-ref-2\">[2]<\/a><\/sup><sup><a href=\"#rio-ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <p>\r\n        In practical projects, protection is evaluated where an exposed cable enters the protected equipment zone. The objective is to keep transient current away from sensitive modules and provide a short, direct path to the intended bonding point.\r\n      <\/p>\r\n\r\n      <figure class=\"rio-figure\">\r\n        <img loading=\"lazy\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/remote-io-spd-installation-positions.webp\"\r\n          alt=\"SPD installation positions at the control cabinet, remote I\/O station and field device\"\r\n          width=\"1448\"\r\n          height=\"1086\"\r\n          loading=\"lazy\"\r\n          decoding=\"async\">\r\n        <figcaption>\r\n          Typical protection positions at the main cabinet, remote I\/O station and field equipment. Both-end protection is evaluated for exposed copper cables; it is not an automatic requirement for every internal connection.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <ol class=\"rio-path-list\">\r\n        <li>\r\n          <strong>Identify every cable entering the station.<\/strong><br>\r\n          Separate DC power, field I\/O, serial bus, Ethernet, shield and auxiliary conductors.\r\n        <\/li>\r\n        <li>\r\n          <strong>Define the protected and unprotected sides.<\/strong><br>\r\n          Do not route an exposed incoming conductor deep into the enclosure before it reaches the SPD.\r\n        <\/li>\r\n        <li>\r\n          <strong>Place protection close to the cable-entry boundary.<\/strong><br>\r\n          Keep the connection to the specified PE or equipotential point short and direct.\r\n        <\/li>\r\n        <li>\r\n          <strong>Separate incoming and protected wiring.<\/strong><br>\r\n          Avoid bundling upstream exposed wiring with downstream protected conductors.\r\n        <\/li>\r\n        <li>\r\n          <strong>Evaluate the opposite end of exposed copper cables.<\/strong><br>\r\n          Both ends may require coordinated protection when the route is outdoor, inter-building or between separate equipotential zones.\r\n        <\/li>\r\n        <li>\r\n          <strong>Confirm the installation against the equipment manual.<\/strong><br>\r\n          The project earthing design and remote I\/O manufacturer\u2019s instructions take priority over a generic diagram.\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <h3>At the Remote I\/O Station<\/h3>\r\n\r\n      <ul>\r\n        <li>Place DC protection before the exposed supply reaches the station power module or potential group.<\/li>\r\n        <li>Place signal protection before exposed field conductors reach sensitive I\/O terminals.<\/li>\r\n        <li>Place communication protection before the copper link reaches the interface module, gateway or switch.<\/li>\r\n        <li>Connect the SPD to the designed bonding point without an unnecessary loop or detour.<\/li>\r\n      <\/ul>\r\n\r\n      <h3>At the Main Control Cabinet<\/h3>\r\n\r\n      <ul>\r\n        <li>Evaluate the controller end of an exposed serial, fieldbus or Ethernet cable.<\/li>\r\n        <li>Place protection before the line reaches the PLC, gateway or industrial switch.<\/li>\r\n        <li>Maintain physical separation between the incoming field zone and protected control wiring.<\/li>\r\n      <\/ul>\r\n\r\n      <h3>At the Field Equipment<\/h3>\r\n\r\n      <p>\r\n        A station-side SPD mainly protects the remote I\/O terminal. It may not adequately protect an exposed transmitter, sensor or actuator at the far end of a long cable.\r\n      <\/p>\r\n\r\n      <p>\r\n        For exposed or high-value field equipment, evaluate a coordinated field-side SPD. Confirm that added resistance, leakage and capacitance remain acceptable for the normal circuit.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-schedule-title\">\r\n      <h2 id=\"rio-schedule-title\"><span class=\"ez-toc-section\" id=\"build-a-remote-io-station-protection-schedule\"><\/span>Build a Remote I\/O Station Protection Schedule<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A station protection schedule turns the design into a document that panel builders, purchasers and project reviewers can approve.\r\n      <\/p>\r\n\r\n      <p>\r\n        One row should represent one electrical path or channel group. Do not put every station circuit into one general line called \u201csignal SPD.\u201d\r\n      <\/p>\r\n\r\n      <div class=\"rio-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Schedule item<\/th>\r\n              <th>What to record<\/th>\r\n              <th>Why it matters<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td data-label=\"Item\"><strong>Protected path<\/strong><\/td>\r\n              <td data-label=\"Record\">24V power, DI group, AI loop, RS485 backhaul or Ethernet link.<\/td>\r\n              <td data-label=\"Why\">Prevents different electrical functions from being treated as one circuit.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Item\"><strong>Source and destination<\/strong><\/td>\r\n              <td data-label=\"Record\">Main cabinet, remote station, field instrument, actuator or adjacent building.<\/td>\r\n              <td data-label=\"Why\">Shows which equipment each SPD is intended to protect.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Item\"><strong>Electrical data<\/strong><\/td>\r\n              <td data-label=\"Record\">Voltage, current, signal range, protocol, frequency or data rate.<\/td>\r\n              <td data-label=\"Why\">Confirms normal-operation compatibility.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Item\"><strong>Reference arrangement<\/strong><\/td>\r\n              <td data-label=\"Record\">Shared 0V, floating pair, isolated channel, shield and PE connection.<\/td>\r\n              <td data-label=\"Why\">Determines the required protection modes and terminal arrangement.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Item\"><strong>Installation position<\/strong><\/td>\r\n              <td data-label=\"Record\">Main cabinet, station entry or field-equipment end.<\/td>\r\n              <td data-label=\"Why\">Prevents the correct SPD from being installed at the wrong boundary.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Item\"><strong>Quantity and spare strategy<\/strong><\/td>\r\n              <td data-label=\"Record\">Installed quantity, spare quantity and replacement method.<\/td>\r\n              <td data-label=\"Why\">Supports panel BOM control and future maintenance.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"rio-callout rio-engineering\">\r\n        <span class=\"rio-callout-label\">OEM meaning<\/span>\r\n        <p>\r\n          The protection schedule can be included in the panel BOM, wiring diagram and sample-approval package. It also helps prevent a purchasing team from replacing several application-specific devices with one superficially similar model.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-approval-title\">\r\n      <h2 id=\"rio-approval-title\"><span class=\"ez-toc-section\" id=\"remote-io-spd-project-approval-matrix\"><\/span>Remote I\/O SPD Project Approval Matrix<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"rio-table-intro\">\r\n        A datasheet is necessary, but it is not the whole approval package. Each decision should be supported by the correct evidence.\r\n      <\/p>\r\n\r\n      <div class=\"rio-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Approval item<\/th>\r\n              <th>Evidence to request<\/th>\r\n              <th>Approval decision<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td data-label=\"Approval item\"><strong>Circuit compatibility<\/strong><\/td>\r\n              <td data-label=\"Evidence\">Remote I\/O wiring diagram, SPD circuit diagram and terminal definition.<\/td>\r\n              <td data-label=\"Decision\">Confirm protection modes and common arrangement.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Approval item\"><strong>Normal operation<\/strong><\/td>\r\n              <td data-label=\"Evidence\">Uc, rated current, resistance, leakage and voltage-drop data.<\/td>\r\n              <td data-label=\"Decision\">Confirm that normal power or signal operation is not disturbed.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Approval item\"><strong>Signal integrity<\/strong><\/td>\r\n              <td data-label=\"Evidence\">Capacitance, insertion loss, frequency range or transmission-rate data.<\/td>\r\n              <td data-label=\"Decision\">Approve directly or require a communication or loop test.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Approval item\"><strong>Surge performance<\/strong><\/td>\r\n              <td data-label=\"Evidence\">Model-specific test declaration, test report or manufacturer technical file.<\/td>\r\n              <td data-label=\"Decision\">Verify the exact model and test scope.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Approval item\"><strong>Installation fit<\/strong><\/td>\r\n              <td data-label=\"Evidence\">Dimensions, terminal layout, PE arrangement and DIN-rail drawing.<\/td>\r\n              <td data-label=\"Decision\">Confirm panel space, wiring access and bonding path.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td data-label=\"Approval item\"><strong>OEM supply<\/strong><\/td>\r\n              <td data-label=\"Evidence\">Label artwork, datasheet, wiring document and packaging sample.<\/td>\r\n              <td data-label=\"Decision\">Approve documentation before the batch order.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p class=\"rio-table-conclusion\">\r\n        Procurement conclusion: approve the exact protective path and model scope. Do not treat one certificate, report or datasheet as automatic approval for every signal version.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-evidence-title\">\r\n      <h2 id=\"rio-evidence-title\"><span class=\"ez-toc-section\" id=\"where-a-leeyee-signal-spd-may-fit%e2%80%94and-where-it-does-not\"><\/span>Where a LEEYEE Signal SPD May Fit\u2014and Where It Does Not<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"rio-evidence\">\r\n        <h3>Published LY10 Signal-Line Direction<\/h3>\r\n\r\n        <p>\r\n          LEEYEE LY10 is a DIN-rail data-signal SPD intended for RS485, telemetry, remote-control and compatible industrial signal circuits. Published model data includes the specifications below.<sup><a href=\"#rio-ref-9\">[9]<\/a><\/sup>\r\n        <\/p>\r\n\r\n        <div class=\"rio-spec-grid\">\r\n          <div class=\"rio-spec-item\">\r\n            <span class=\"rio-spec-label\">Rated operating voltage<\/span>\r\n            <span class=\"rio-spec-value\">12V \/ 24V \/ 48V DC<\/span>\r\n          <\/div>\r\n          <div class=\"rio-spec-item\">\r\n            <span class=\"rio-spec-label\">Maximum continuous voltage<\/span>\r\n            <span class=\"rio-spec-value\">15V \/ 30V \/ 60V DC<\/span>\r\n          <\/div>\r\n          <div class=\"rio-spec-item\">\r\n            <span class=\"rio-spec-label\">Rated load current<\/span>\r\n            <span class=\"rio-spec-value\">500mA<\/span>\r\n          <\/div>\r\n          <div class=\"rio-spec-item\">\r\n            <span class=\"rio-spec-label\">Transmission rate<\/span>\r\n            <span class=\"rio-spec-value\">Up to 10Mbps<\/span>\r\n          <\/div>\r\n          <div class=\"rio-spec-item\">\r\n            <span class=\"rio-spec-label\">Insertion loss<\/span>\r\n            <span class=\"rio-spec-value\">\u2264 0.2dB<\/span>\r\n          <\/div>\r\n          <div class=\"rio-spec-item\">\r\n            <span class=\"rio-spec-label\">Installation<\/span>\r\n            <span class=\"rio-spec-value\">35mm DIN rail<\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <p>\r\n          These published values provide a starting direction for compatible RS485 and low-voltage industrial signal circuits. They do not automatically approve LY10 for every DI, DO, AI, AO, 24V power feeder or Ethernet path.\r\n        <\/p>\r\n\r\n        <p>\r\n          Before approval, confirm the circuit wiring, current, signal range, channel reference, transmission requirement, installation position and required technical documents.\r\n        <\/p>\r\n\r\n        <p>\r\n          <a href=\"https:\/\/www.cnspd.com\/portfolio\/ly10-data-signal-dc-surge-protective-device\/\">Review the LEEYEE LY10 product data<\/a>.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"rio-callout rio-warning\">\r\n        <strong>Do not select LY10 from the \u201c24V\u201d label alone.<\/strong>\r\n        <p>\r\n          A 24V RS485 signal circuit, a 24V digital output, a 4\u201320mA loop and a 24V station power feeder can have different current, impedance, leakage and protection requirements.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <p class=\"rio-light-note\">\r\n        LEEYEE is a specialized surge protection and low-voltage protection supplier. CNSPD is LEEYEE\u2019s surge-protection-focused platform for global technical buyers.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-scenario-title\">\r\n      <h2 id=\"rio-scenario-title\"><span class=\"ez-toc-section\" id=\"typical-remote-io-protection-scenarios\"><\/span>Typical Remote I\/O Protection Scenarios<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"rio-scenario\">\r\n        <h3>Outdoor Pump or Water-Treatment Station<\/h3>\r\n        <p>\r\n          The station may connect a 24V supply, level transmitters, pressure sensors, valve outputs and an RS485 or Ethernet backhaul.\r\n        <\/p>\r\n        <p>\r\n          Review the DC power entrance, exposed 4\u201320mA loops, communication link, enclosure bonding and any field-side protection required near outdoor instruments.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"rio-scenario\">\r\n        <h3>Long Conveyor or Production Line<\/h3>\r\n        <p>\r\n          Distributed I\/O reduces multicore cabling, but the local station may still connect long sensor runs, solenoid valves, contactors and industrial Ethernet.\r\n        <\/p>\r\n        <p>\r\n          Evaluate each external cable entrance. Inductive loads may also require local suppression specified by the load or output-module manufacturer. Load suppression and system-level surge protection perform different functions.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"rio-scenario\">\r\n        <h3>Remote I\/O Between Buildings<\/h3>\r\n        <p>\r\n          Copper power or communication cables may cross separate equipotential zones.\r\n        <\/p>\r\n        <p>\r\n          Review both cable ends, bonding, shield treatment and the option of fibre. The site lightning-protection design should define the relevant protection-zone transition.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"rio-scenario\">\r\n        <h3>Skid, Packaged Machine or OEM Equipment<\/h3>\r\n        <p>\r\n          A skid builder may supply a remote I\/O cabinet before the final plant cable routes and earthing conditions are known.\r\n        <\/p>\r\n        <p>\r\n          The OEM documentation should state which interfaces are protected, the assumed cable exposure and which external protection must be provided by the final installer.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-mistake-title\">\r\n      <h2 id=\"rio-mistake-title\"><span class=\"ez-toc-section\" id=\"common-remote-io-protection-mistakes\"><\/span>Common Remote I\/O Protection Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <h3>Protecting Only the Main PLC Cabinet<\/h3>\r\n      <p>\r\n        The remote station may still receive transient energy through local power, field wiring or the communication backhaul.\r\n      <\/p>\r\n\r\n      <h3>Installing One SPD Across the Entire 24V System<\/h3>\r\n      <p>\r\n        A DC power SPD addresses the supply path. It does not automatically protect each exposed signal and data interface.\r\n      <\/p>\r\n\r\n      <h3>Using the Same Device for DI, AI and RS485<\/h3>\r\n      <p>\r\n        These circuits may have different current, leakage, resistance, capacitance and transmission requirements.\r\n      <\/p>\r\n\r\n      <h3>Ignoring Potential Groups<\/h3>\r\n      <p>\r\n        A multi-channel protector must match the way the station shares or isolates common terminals. The wrong connection can bypass intended isolation.\r\n      <\/p>\r\n\r\n      <h3>Protecting Only One End of an Exposed Link<\/h3>\r\n      <p>\r\n        The opposite end may remain exposed to a local transient or earth-potential rise. Evaluate both ends according to the cable route and project zone concept.\r\n      <\/p>\r\n\r\n      <h3>Confusing Equipment Immunity with Installation Protection<\/h3>\r\n      <p>\r\n        A laboratory immunity result applies to a defined test arrangement. The field installation adds real cable length, routing, bonding and external energy sources.<sup><a href=\"#rio-ref-4\">[4]<\/a><\/sup>\r\n      <\/p>\r\n\r\n      <h3>Selecting by Surge Current Alone<\/h3>\r\n      <p>\r\n        For signal and data paths, operating voltage, current, leakage, resistance, capacitance, bandwidth and connector arrangement can be equally important.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-checklist-title\">\r\n      <h2 id=\"rio-checklist-title\"><span class=\"ez-toc-section\" id=\"before-ordering-a-remote-io-protection-solution\"><\/span>Before Ordering a Remote I\/O Protection Solution<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A cabinet photograph can help, but it does not replace the station model, wiring diagram, cable schedule and grounding information.\r\n      <\/p>\r\n\r\n      <div class=\"rio-checklist\">\r\n        <ul>\r\n          <li>Remote I\/O manufacturer and full model.<\/li>\r\n          <li>Interface and power-module model numbers.<\/li>\r\n          <li>Local or centrally supplied 24V power.<\/li>\r\n          <li>DC nominal and maximum voltage.<\/li>\r\n          <li>Total station and field-load current.<\/li>\r\n          <li>Grounded, floating, SELV or PELV arrangement.<\/li>\r\n          <li>DI, DO, AI and AO quantities.<\/li>\r\n          <li>Electrical type of each channel group.<\/li>\r\n          <li>Signal voltage or measurement range.<\/li>\r\n          <li>Maximum channel and load current.<\/li>\r\n          <li>Two-wire, three-wire or four-wire topology.<\/li>\r\n          <li>Shared common, isolated channel or potential group.<\/li>\r\n          <li>RS485, PROFIBUS, CAN or Ethernet protocol.<\/li>\r\n          <li>Data rate, PoE requirement and connector type.<\/li>\r\n          <li>Cable length and indoor or outdoor route.<\/li>\r\n          <li>Whether cables cross buildings or earthing zones.<\/li>\r\n          <li>Shield and PE bonding method.<\/li>\r\n          <li>Available DIN-rail width.<\/li>\r\n          <li>Required standard and project documents.<\/li>\r\n          <li>Quantity, spare units and replacement strategy.<\/li>\r\n          <li>OEM label, packaging and documentation needs.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n\r\n      <div class=\"rio-callout rio-engineering\">\r\n        <span class=\"rio-callout-label\">Approval boundary<\/span>\r\n        <p>\r\n          The final SPD configuration must be checked against the remote I\/O manual, wiring diagram, expected surge environment, project specification and applicable installation rules. A general article cannot approve a specific safety, hazardous-area or functional-safety circuit.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"rio-cta\" aria-labelledby=\"rio-cta-title\">\r\n      <h2 id=\"rio-cta-title\"><span class=\"ez-toc-section\" id=\"need-a-remote-io-station-protection-review\"><\/span>Need a Remote I\/O Station Protection Review?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>\r\n        Send the station model, power architecture, channel schedule, communication protocol, cable route and grounding diagram. LEEYEE can help separate the power, field I\/O and backhaul requirements for an industrial control panel or OEM project.\r\n      <\/p>\r\n      <a href=\"javascript:void(0);\" class=\"leeyee-site-popup-btn\"><span>Request Remote I\/O SPD Review<\/span><\/a>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-faq-title\">\r\n      <h2 id=\"rio-faq-title\"><span class=\"ez-toc-section\" id=\"remote-io-surge-protection-faq\"><\/span>Remote I\/O Surge Protection FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"rio-faq\">\r\n        <details>\r\n          <summary>Does every remote I\/O channel need an SPD?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              No. The decision depends on cable exposure, equipment value, downtime risk and the electrical characteristics of the circuit. Outdoor, long-distance, inter-building and cross-zone conductors normally require the closest review.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Is one 24V DC SPD enough for the whole station?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              Not necessarily. A DC SPD protects the power path. Field I\/O and copper communication lines can provide separate transient paths and should be evaluated independently.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Can one multi-channel SPD protect several remote I\/O channels?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              It may be possible when the channels share compatible voltage, current, signal, common-reference and isolation characteristics. Do not combine unrelated channel types only to reduce device quantity.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Where should a signal SPD be installed?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              It is normally placed close to the point where the exposed field cable enters the station enclosure and before the conductor reaches the sensitive I\/O terminal.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Should RS485 protection be installed at both ends?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              Evaluate both ends when the cable is long, outdoors, between buildings or between separate equipotential zones. Both devices must suit the protocol, conductor arrangement, shield and grounding design.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Does industrial Ethernet need a dedicated SPD?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              Yes. The SPD must support the required Ethernet category and transmission rate. It must also match the shielding and PoE requirements where power is carried on the same cable.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Does built-in surge immunity remove the need for an external SPD?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              Not automatically. Built-in protection and EMC immunity apply to the tested equipment configuration. External protection may still be required when field cables cross exposed electrical zones.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Is fibre always better for inter-building remote I\/O?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              Fibre removes the conductive data path and can reduce communication-line surge risk. The project must still assess the remote station\u2019s power supply, converters and copper field circuits.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>What should an OEM buyer approve before a batch order?<\/summary>\r\n          <div class=\"rio-faq-answer\">\r\n            <p>\r\n              Approve the station protection schedule, exact SPD models, wiring diagrams, electrical compatibility, mechanical fit, test-document scope, labels, datasheets and packaging requirements.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-related-title\">\r\n      <h2 id=\"rio-related-title\"><span class=\"ez-toc-section\" id=\"related-technical-guides\"><\/span>Related Technical Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <ul class=\"rio-related\">\r\n        <li><a href=\"https:\/\/www.cnspd.com\/plc-io-signal-surge-protection\/\">PLC I\/O Signal Surge Protection Guide<\/a><\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/sensor-line-surge-protection\/\">Sensor Line Surge Protection Guide<\/a><\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/24v-signal-surge-protector\/\">24V Signal Surge Protector Selection Guide<\/a><\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/rs485-spd-wiring-selection\/\">RS485 SPD Wiring and Selection Guide<\/a><\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/factory-automation-surge-protection\/\">Factory Automation Surge Protection Guide<\/a><\/li>\r\n      <\/ul>\r\n    <\/section>\r\n\r\n    <section aria-labelledby=\"rio-reference-title\">\r\n      <h2 id=\"rio-reference-title\"><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <ol class=\"rio-references\">\r\n        <li id=\"rio-ref-1\">\r\n          International Electrotechnical Commission. <em>IEC 61643-21:2025, Low-voltage surge protective devices connected to telecommunications and signalling networks \u2014 Requirements and test methods.<\/em>\r\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-2\">\r\n          International Electrotechnical Commission. <em>IEC 61643-22:2015, Low-voltage surge protective devices \u2014 Part 22: Surge protective devices connected to telecommunications and signalling networks \u2014 Selection and application principles.<\/em>\r\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/22772\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-3\">\r\n          International Electrotechnical Commission. <em>IEC 62305-4:2024, Protection against lightning \u2014 Part 4: Electrical and electronic systems within structures.<\/em>\r\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29590\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-4\">\r\n          International Electrotechnical Commission. <em>IEC 61000-4-5:2014+A1:2017, Electromagnetic compatibility \u2014 Part 4-5: Testing and measurement techniques \u2014 Surge immunity test.<\/em>\r\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/61166\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-5\">\r\n          Siemens. <em>SIMATIC ET 200SP Distributed I\/O System<\/em>, official product and system documentation covering distributed I\/O architecture, supply, potential groups, installation and wiring.\r\n          <a href=\"https:\/\/www.siemens.com\/en-us\/products\/simatic\/et-200sp\/\" target=\"_blank\" rel=\"nofollow noopener\">Official Siemens product page<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-6\">\r\n          Texas Instruments. Cameron Phillips. <em>Protecting I\/O Modules from Surge Events<\/em>, application brief SLVAE72.\r\n          <a href=\"https:\/\/www.ti.com\/lit\/pdf\/slvae72\" target=\"_blank\" rel=\"nofollow noopener\">Official TI application brief<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-7\">\r\n          Phoenix Contact. <em>Surge Protection for MCR Technology and Signals<\/em>, covering common-reference signals, floating analogue loops, industrial data circuits and field-device protection.\r\n          <a href=\"https:\/\/www.phoenixcontact.com\/en-pc\/products\/surge-protection\/surge-protection-for-mcr-technology-and-signals\" target=\"_blank\" rel=\"nofollow noopener\">Official Phoenix Contact technical page<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-8\">\r\n          Weidm\u00fcller. <em>Surge Protection for Instrumentation and Control<\/em>, covering protection for binary, analogue and industrial signal circuits.\r\n          <a href=\"https:\/\/www.weidmueller.com\/int\/products\/electronics\/lightning_and_surge_protection\/surge_protection_for_instrumentation_and_control_%28i_c%29.jsp\" target=\"_blank\" rel=\"nofollow noopener\">Official Weidm\u00fcller technical page<\/a>.\r\n        <\/li>\r\n\r\n        <li id=\"rio-ref-9\">\r\n          LEEYEE. <em>LY10 RS485 DIN-Rail Data Signal Surge Protector<\/em>, published product specifications for rated voltage, maximum continuous voltage, load current, transmission rate, insertion loss and installation.\r\n          <a href=\"https:\/\/www.cnspd.com\/portfolio\/ly10-data-signal-dc-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\">Official LEEYEE product page on CNSPD<\/a>.\r\n        <\/li>\r\n      <\/ol>\r\n    <\/section>\r\n\r\n  <\/div>\r\n<\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>A remote I\/O station, also called a distributed I\/O station or field I\/O node, places input and output modules close to sensors and actuators. It then connects the station to a PLC, DCS or industrial controller through a communication network. This architecture reduces field cabling, but it also puts sensitive electronics beside local 24V power,&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-30449","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Remote I\/O Surge Protection Guide: 24V, I\/O &amp; Networks<\/title>\n<meta name=\"description\" content=\"Plan surge protection for remote I\/O stations, including 24V DC power, DI\/DO\/AI\/AO, RS485, Ethernet, grounding, installation and OEM approval.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Remote I\/O Surge Protection Guide: 24V, I\/O &amp; Networks\" \/>\n<meta property=\"og:description\" content=\"Plan surge protection for remote I\/O stations, including 24V DC power, DI\/DO\/AI\/AO, RS485, Ethernet, grounding, installation and OEM approval.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-27T07:52:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-27T08:04:51+00:00\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"19 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Remote I\\\/O Surge Protection Guide for Industrial Automation\",\"datePublished\":\"2026-07-27T07:52:32+00:00\",\"dateModified\":\"2026-07-27T08:04:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/\"},\"wordCount\":4038,\"articleSection\":[\"News\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/\",\"name\":\"Remote I\\\/O Surge Protection Guide: 24V, I\\\/O & Networks\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"datePublished\":\"2026-07-27T07:52:32+00:00\",\"dateModified\":\"2026-07-27T08:04:51+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"description\":\"Plan surge protection for remote I\\\/O stations, including 24V DC power, DI\\\/DO\\\/AI\\\/AO, RS485, Ethernet, grounding, installation and OEM approval.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/remote-io-surge-protection\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.cnspd.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Remote I\\\/O Surge Protection Guide for Industrial Automation\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/\",\"name\":\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\",\"description\":\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.cnspd.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\",\"name\":\"Devin Ling\",\"sameAs\":[\"https:\\\/\\\/cnspd.com\\\/\"],\"url\":\"https:\\\/\\\/www.cnspd.com\\\/fr\\\/author\\\/devin\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Remote I\/O Surge Protection Guide: 24V, I\/O & Networks","description":"Plan surge protection for remote I\/O stations, including 24V DC power, DI\/DO\/AI\/AO, RS485, Ethernet, grounding, installation and OEM approval.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/","og_locale":"fr_FR","og_type":"article","og_title":"Remote I\/O Surge Protection Guide: 24V, I\/O & Networks","og_description":"Plan surge protection for remote I\/O stations, including 24V DC power, DI\/DO\/AI\/AO, RS485, Ethernet, grounding, installation and OEM approval.","og_url":"https:\/\/www.cnspd.com\/fr\/remote-io-surge-protection\/","og_site_name":"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE","article_published_time":"2026-07-27T07:52:32+00:00","article_modified_time":"2026-07-27T08:04:51+00:00","author":"Devin Ling","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"Devin Ling","Dur\u00e9e de lecture estim\u00e9e":"19 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.cnspd.com\/remote-io-surge-protection\/#article","isPartOf":{"@id":"https:\/\/www.cnspd.com\/remote-io-surge-protection\/"},"author":{"name":"Devin Ling","@id":"https:\/\/www.cnspd.com\/#\/schema\/person\/f49dbafe62c5b47100ad2d9f88af92d3"},"headline":"Remote I\/O Surge Protection Guide for Industrial Automation","datePublished":"2026-07-27T07:52:32+00:00","dateModified":"2026-07-27T08:04:51+00:00","mainEntityOfPage":{"@id":"https:\/\/www.cnspd.com\/remote-io-surge-protection\/"},"wordCount":4038,"articleSection":["News"],"inLanguage":"fr-FR"},{"@type":"WebPage","@id":"https:\/\/www.cnspd.com\/remote-io-surge-protection\/","url":"https:\/\/www.cnspd.com\/remote-io-surge-protection\/","name":"Remote I\/O Surge Protection Guide: 24V, I\/O & Networks","isPartOf":{"@id":"https:\/\/www.cnspd.com\/#website"},"datePublished":"2026-07-27T07:52:32+00:00","dateModified":"2026-07-27T08:04:51+00:00","author":{"@id":"https:\/\/www.cnspd.com\/#\/schema\/person\/f49dbafe62c5b47100ad2d9f88af92d3"},"description":"Plan surge protection for remote I\/O stations, including 24V DC power, DI\/DO\/AI\/AO, RS485, Ethernet, grounding, installation and OEM approval.","breadcrumb":{"@id":"https:\/\/www.cnspd.com\/remote-io-surge-protection\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.cnspd.com\/remote-io-surge-protection\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.cnspd.com\/remote-io-surge-protection\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.cnspd.com\/"},{"@type":"ListItem","position":2,"name":"Remote I\/O Surge Protection Guide for Industrial Automation"}]},{"@type":"WebSite","@id":"https:\/\/www.cnspd.com\/#website","url":"https:\/\/www.cnspd.com\/","name":"Protecteur de surtension, parafoudre, interrupteur de s\u00e9paration - LEEYEEEE","description":"Protecteur de surtension, parafoudre, interrupteur de s\u00e9paration - LEEYEEEE","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.cnspd.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Person","@id":"https:\/\/www.cnspd.com\/#\/schema\/person\/f49dbafe62c5b47100ad2d9f88af92d3","name":"Devin Ling","sameAs":["https:\/\/cnspd.com\/"],"url":"https:\/\/www.cnspd.com\/fr\/author\/devin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts\/30449","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/comments?post=30449"}],"version-history":[{"count":6,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts\/30449\/revisions"}],"predecessor-version":[{"id":30458,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts\/30449\/revisions\/30458"}],"wp:attachment":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/media?parent=30449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/categories?post=30449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/tags?post=30449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}