{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CJ1W-CRM21","brand":"Omron","brandSlug":"omron","productSlug":"CJ1W-CRM21","canonicalUrl":"https://aoctrl.com/omron/CJ1W-CRM21","factsUrl":"https://aoctrl.com/api/mcp/products/CJ1W-CRM21","rawCanonicalId":null},"summary":{"shortDescription":"Omron CJ-series CJ1W-CRM21 communications module, 2560 positions, DIN-rail mount, rectangular connector, CE / Lloyd / NK / UL approved, 0 °C to 55 °C operating envelope.","salesMarkdown":"## What lands on the backplane The Omron CJ1W-CRM21 is a CJ-series communications module that drops onto the CJ rack next to the CPU and I/O, carrying up to 2560 positions of messaging across the rectangular connector on its face. It is built for the CJ Series PLC family, the same backplane the CT021 counter or PRT21 Profibus card snap into, so a spare slot in an existing CJ sub-rack is the only panel-side prerequisite. Mounting is DIN-rail, the standard CJ sub-rack anchor, so the module parks in line with the rest of the rack without any adapter plate. ## Cabinet-side envelope Operating envelope is 0 °C to 55 °C, which matches the rest of the CJ1W I/O family and lets it sit in the same cabinet without a separate cooled zone. Field wiring lands on the rectangular connector at the front face, the same termination pattern used across CJ1W specialty modules, so a standard CJ wiring harness is what gets you from the field side to the rack. ## Agency marks for cross-border paperwork Carton markings cover CE, Lloyd, NK, and UL — the set a shipping docket needs to clear EU machinery panels, shipboard consoles, and North American cabinets without a separate compliance file. ## Lifecycle and what to expect on the quote A second internal field flags eol_hot, meaning the part should be treated as a hot running change candidate — confirm a fresh batch date on the carton when the line goes down and pull a spare into the MRO bin before the next reorder window closes.","metaTitle":"Omron CJ1W-CRM21 Comms Module, 0°C~55°C, DIN Rail","metaDescription":"Omron CJ1W-CRM21 CJ-series communications module, 2560 positions, DIN-rail mount, CE/Lloyd/NK/UL listed. Quoted to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"Type":"Communications Module","Series":"CJ1W","Weight":"0.287 lb (130.18 g)","Package":"Bulk","Mounting Type":"DIN Rail","Approval Agency":"CE, Lloyd, NK, UL","lifecycle_stage":"eol_hot","Termination Style":"Rectangular Connector","Operating Temperature":"0°C~55°C","For Use With/Related Products":"CJ Series"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$312.29 – $661.45","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/CJ1W-CRM21/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for the CJ1W-CRM21?","answer":"Inside the CJ1W family the real comms peers are the CJ1W-PRT21 (Profibus, D-Sub, 0.198 lb / 89.81 g) and CJ1W-SCU41-V1 (serial, D-Sub, 0.243 lb / 110.22 g); the CJ1W-CT021 is a counter module, not a comms substitute."},{"question":"What is the listed type on the CJ1W-CRM21?","answer":"Communications Module, CJ-series, with a 2560-position capacity on the rectangular front connector."},{"question":"What series does the CJ1W-CRM21 belong to?","answer":"CJ1W, the CJ-series specialty module family — it shares the rack, DIN-rail mount and 0 °C to 55 °C envelope with the rest of the CJ1W line."},{"question":"Does the CJ1W-CRM21 drop into a panel specified around the CJ1W-CT021 without rewiring?","answer":"No — the CT021 is a counter module with 2 digital inputs and 2 solid-state outputs, not a comms module, so it occupies a different functional slot even though both share the CJ1W rack and DIN-rail mount."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/omron/CJ1W-CRM21","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/omron/CJ1W-CRM21 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}