{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CS1W-MD291","brand":"Omron","brandSlug":"omron","productSlug":"CS1W-MD291","canonicalUrl":"https://aoctrl.com/omron/CS1W-MD291","factsUrl":"https://aoctrl.com/api/mcp/products/CS1W-MD291","rawCanonicalId":null},"summary":{"shortDescription":"Omron CS1W series input/output module, 48 digital inputs and 48 solid-state outputs on a CS-series backplane, bulk packaged, rectangular connector termination.","salesMarkdown":"## What it sits as on the rack The Omron CS1W-MD291 is a mixed digital I/O module for the CS Series family — a single backplane card carrying 48 digital inputs and 48 solid-state outputs on the same connector footprint, so one slot services both signal directions into the controller. It's a backplane-mounted module with rectangular-connector field wiring, shipped in bulk packaging, and carries the full agency set the CS Series tends to land with: CE, CSA, Lloyd, NK, and UL on the approval roster. ## Where this class earns its slot A 48-in / 48-out mixed card is the right density choice when a CS rack has more digital I/O than dedicated input or output slots want to absorb — it lets the integrator collapse a slot pair into one, leaving rack room for specialty cards (high-speed counters, analog, comms) that can't be subbed with a pure digital module. Field wiring lands on the rectangular connector at the card face; the same connector pattern is used across the CS1W I/O range, so termination practice established for adjacent CS cards carries over without re-tooling. ## Sizing against the CS1W siblings Within the CS1W family the CS1W-MD291 is the largest balanced mixed module; the closest same-class alternative, the CS1W-MD261, drops to 32 digital inputs and 32 solid-state outputs on the same backplane format — useful as a density half-step when a 48/48 card over-specs the I/O count but you want to stay in the mixed-I/O flavour. For pure-direction panels, the higher-density options are the CS1W-OD291 at 96 solid-state outputs and the CS1W-ID261 at 64 digital inputs — both backplane modules in the same CS1W shell, and both the cards you'd specify instead of an MD variant when every point runs one way. ## Lifecycle posture That said, the channel-side lifecycle flag on this card reads eol_hot, which means it's being watched for end-of-life pressure even while still orderable — a planning buyer should treat it as a part to specify on a near-term BOM rather than park on a multi-year spares shelf without a re-quote.","metaTitle":"Omron CS1W-MD291 I/O Module, 48 Digital In / 48 Solid-State","metaDescription":"CS1W-MD291 is an Active CS1W-series mixed I/O module: 48 digital inputs, 48 solid-state outputs on a backplane-mounted card for CS Series racks.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"Type":"Input, Output (I/O) Module","title":"CS1W-MD291","Series":"CS1W","Weight":"0.706 lb (320.24 g)","Package":"Bulk","description":"I/O MODULE 48 DIG 48 SOLID ST","Mounting Type":"Backplane","Approval Agency":"CE, CSA, Lloyd, NK, UL","lifecycle_stage":"eol_hot","Termination Style":"Rectangular Connector","Number of Inputs and Type":"48 - Digital","Number of Outputs and Type":"48 - Solid State","For Use With/Related Products":"CS Series"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$625.48 – $1,555.15","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c42a3b59869e077945dabc1a8c5a87d9.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What type of module is the CS1W-MD291?","answer":"It's an Input/Output (I/O) Module — the mixed digital flavour, with 48 digital inputs and 48 solid-state outputs on a single CS1W backplane card."},{"question":"What series does the CS1W-MD291 belong to?","answer":"The CS1W series, which is the I/O family for Omron's CS Series controller racks."},{"question":"Will the CS1W-MD291 drop into a panel specified around a CS1W-MD261 without rewiring?","answer":"No — the CS1W-MD261 is the smaller 32-in / 32-out variant; the two share the CS1W backplane form factor but carry different I/O counts, so a swap adds or subtracts points and changes the wiring map rather than being a like-for-like replacement."},{"question":"What approvals does the CS1W-MD291 carry?","answer":"Approval agencies on the card are CE, CSA, Lloyd, NK, and UL — the full CS1W agency set, suitable for the panel decl pack a compliance buyer would trace."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/CS1W-MD291","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-MD291 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}}