{"product_id":"honeywell-621-9938r-serial-i-o-module","title":"Honeywell 621-9938R Serial I\/O Module","description":"\u003cp\u003eThe \u003cstrong\u003e621-9938R\u003c\/strong\u003e is a redundant serial I\/O module manufactured by Honeywell for the IPC 620 programmable controller system. It controls serial I\/O card file racks and provides serial link communication interface capabilities when paired with the 621-9939 Serial Link Module (SLM). Designed with redundant processing channels, it maintains uninterrupted field I\/O data transfers across high-availability industrial PLC control architectures.\u003c\/p\u003e\n\u003ch3\u003eRedundant Architecture and System Integration\u003c\/h3\u003e\n\u003cp\u003eThe module manages serial communication pathways between local processor racks and remote or secondary serial I\/O expansion chassis. In redundant IPC 620 control setups, the 621-9938R collaborates directly with the Model 621-9939 SLM to establish deterministic, fail-safe serial link connections across dual card files, ensuring smooth takeover in the event of a primary communication channel fault.\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e621-9938R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSerial I\/O Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eHoneywell IPC 620 Controller Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Function\u003c\/td\u003e\n\u003ctd\u003eSerial I\/O Card File Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Module Pairing\u003c\/td\u003e\n\u003ctd\u003eHoneywell Model 621-9939 SLM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy Support\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e1.85 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eFrequently Asked Questions\u003c\/p\u003e\n\u003cp\u003eQ: What primary role does the Honeywell 621-9938R module serve in an IPC 620 system?\u003c\/p\u003e\n\u003cp\u003eA: It controls the serial I\/O card file chassis and provides structured serial link management between processor racks and expansion I\/O files.\u003c\/p\u003e\n\u003cp\u003eQ: Which companion module is required to establish serial link communications with the 621-9938R?\u003c\/p\u003e\n\u003cp\u003eA: The 621-9938R interfaces directly with the Honeywell Model 621-9939 Serial Link Module (SLM).\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":68047648751912,"sku":"621-9938R","price":315.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0827\/6266\/2184\/files\/621-9938R.png?v=1793347013","url":"https:\/\/www.powerdcs.com\/es\/products\/honeywell-621-9938r-serial-i-o-module","provider":"Power DCS Parts Limited","version":"1.0","type":"link"}