{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CS1W-CT021","brand":"Omron","brandSlug":"omron","productSlug":"CS1W-CT021","canonicalUrl":"https://aoctrl.com/omron/CS1W-CT021","factsUrl":"https://aoctrl.com/api/mcp/products/CS1W-CT021","rawCanonicalId":null},"summary":{"shortDescription":"Omron CS1W series CS1W-CT021 counter module, 4 digital inputs and 4 solid-state outputs, backplane-mounted D-Sub termination, CS Series compatibility.","salesMarkdown":"## What it does on the rack The Omron CS1W-CT021 is a Counter Module in the CS1W series, sitting on the CS Series backplane and presenting four digital inputs against four solid-state outputs to the CPU scan. Field wiring lands on a D-Sub connector at the module face, so the pulse sources — encoders, proximity counters, flow-meter pulses — terminate to a single multi-pin plug rather than screw terminals. It runs across a 0°C~55°C ambient window and carries CE, cULus, Lloyd, and NK approvals, which covers the usual UL-panel and marine-class builds without a separate submittal package. ## Closest functional sibling The other CS1W siblings on file (CS1W-SCU31-V1, CS1W-ETN01) are Communications Modules and are not cross-shop candidates for a counter slot. ## Panel-side fit D-Sub termination keeps the wiring job on a single plug, which is the right choice when the four input sources are encoder or pulse lines and you want one crimp-and-go harness rather than four discrete terminal landings.","metaTitle":"Omron CS1W-CT021 Counter Module, 4 Dig / 4 Solid State","metaDescription":"Omron CS1W-CT021 backplane counter module, 4 digital inputs and 4 solid-state outputs, CS Series. CE, cULus, Lloyd, NK approved. Sourced 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":"Counter Module","title":"CS1W-CT021","Series":"CS1W","Weight":"0.54 lb (244.94 g)","Package":"Bulk","description":"COUNTER MODULE 4 DIG 4 SOLID ST","Mounting Type":"Backplane","Approval Agency":"CE, cULus, Lloyd, NK","lifecycle_stage":"eol_hot","Termination Style":"D-Sub","Operating Temperature":"0°C~55°C","Number of Inputs and Type":"4 - Digital","Number of Outputs and Type":"4 - Solid State","For Use With/Related Products":"CS Series"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$405.77","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"When sourcing CS1W-CT021, what is the closest functional second-source — CS1W-CTS21?","answer":"CS1W-CTS21 matches on I/O count, backplane mounting, D-Sub termination and operating envelope, but it is listed as an Interface Module rather than a Counter Module — same slot, different functional class, so verify the counter-mode behavior in the application before treating it as a swap."},{"question":"What is CS1W-CT021's listed type on this component line?","answer":"Counter Module, in the CS1W series."},{"question":"Will CS1W-CT021 drop into a panel that was specified around CS1W-CTS21 without rewiring?","answer":"Mechanically yes — same CS1W backplane, same D-Sub field connector, same 0°C~55°C range — but functionally the CTS21 is an Interface Module, not a Counter Module, so the ladder logic and pulse-handling behavior need to be re-validated rather than assumed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/CS1W-CT021","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/CS1W-CT021 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}