{"product_id":"honeywell-621-4350r-digital-input-module","title":"Honeywell 621-4350R Digital Input Module","description":"\u003ch3\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eHoneywell 621‑4350R \u003c\/strong\u003eis a precision Digital Input (DI) module engineered for Honeywell 620\/621 Series, TDC 2000, and TDC 3000 distributed control systems. Designed for industrial reliability, it captures discrete ON\/OFF signals from field devices such as limit switches, pushbuttons, proximity sensors, interlocks, and alarm contacts.\u003c\/p\u003e\n\u003cp\u003eThis module features robust electrical isolation and noise-resistant inputs, converting field signals into logic-level data compatible with the controller. The “R” designation signifies a hot-swap capability, enabling maintenance or replacement without powering down the I\/O rack—critical for minimizing process downtime.\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e621‑4350R\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis widely used in process industries including power generation, petrochemical, refining, and manufacturing, providing dependable signal acquisition in harsh industrial conditions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e621‑4350R\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eHoneywell 620\/621 Series, TDC 2000, TDC 3000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Type\u003c\/td\u003e\n\u003ctd\u003eDiscrete digital inputs (TTL \/ 5 VDC logic compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e16-point DI (standard variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e5 V TTL (logic-level input) \/ 24 VDC field compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eChannel-to-channel and channel-to-logic isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Conditioning\u003c\/td\u003e\n\u003ctd\u003eDebounce filtering, noise suppression\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHot-Swap Capability\u003c\/td\u003e\n\u003ctd\u003eYes, supports insertion\/removal under power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostics\u003c\/td\u003e\n\u003ctd\u003eIndividual input LEDs, module health monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eRack-mounted, standard 620-series form factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0°C to 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.10 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eReliable acquisition of discrete ON\/OFF signals in noisy industrial environments\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStrong electrical isolation for channel integrity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHot-replaceable design for minimal downtime\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRugged construction for long operational life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVisual status indicators for rapid diagnostics\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSeamless integration with Honeywell 620\/621 Series and TDC controllers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e621‑4350R\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis ideal for:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eMonitoring limit switches, pushbuttons, and proximity sensors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eImplementing interlocks and alarm signal collection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMachine and process status monitoring in manufacturing and refining plants\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSystems requiring high uptime and hot-swappable I\/O modules\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 621‑4350R be replaced while the system is powered?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the “R” suffix denotes hot-swap capability, allowing safe replacement without shutting down the I\/O rack.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What voltage levels are supported?\u003c\/strong\u003e\u003cbr\u003eA: The module accepts standard 24 VDC field inputs, compatible with 5 V TTL logic levels for controller interface.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How many input channels are available?\u003c\/strong\u003e\u003cbr\u003eA: Standard configuration includes 16 discrete input channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Are there similar modules for analog inputs?\u003c\/strong\u003e\u003cbr\u003eA: Honeywell 621 series also offers analog input modules (HLAI) for continuous signal acquisition with high accuracy.\u003c\/p\u003e","brand":"HONEYWELL","offers":[{"title":"Default Title","offer_id":42916564959322,"sku":"621-4350R","price":209.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/621-4350R2.jpg?v=1770875864","url":"https:\/\/www.plcmasters.com\/ru\/products\/honeywell-621-4350r-digital-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}