{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CJ2M-CPU31","brand":"Omron","brandSlug":"omron","productSlug":"CJ2M-CPU31","canonicalUrl":"https://aoctrl.com/omron/CJ2M-CPU31","factsUrl":"https://aoctrl.com/api/mcp/products/CJ2M-CPU31","rawCanonicalId":null},"summary":{"shortDescription":"Omron CJ2M series CPU, built-in EtherNet/IP, 64K word memory, expandable 40 modules (3 racks), battery backup, DIN-rail mount.","salesMarkdown":"## CPU with built-in EtherNet/IP The CJ2M-CPU31 is an Omron CJ2M family CPU equipped with a native EtherNet/IP port for controller-to-controller and HMI connectivity without an additional module. It holds 64K words of program memory and supports up to 40 I/O modules across three expansion racks. Battery backup retains the program and data through power loss. The CX-One software suite handles configuration, programming, and network setup. ## Integration notes Rack expansion tops out at three racks — sufficient for a medium-scale machine with mixed discrete and analog I/O. The built-in Ethernet port defaults to tag-based communications; option card slots (left side) accept fieldbus modules if the existing network requires Profibus, DeviceNet, or additional serial interfaces. Approvals include CE, cULus, Lloyd's, and NK, covering most industrial and marine applications. Confirm specific certification requirements for your target environment before committing the BOM.","metaTitle":"Omron CJ2M-CPU31 PLC CPU, 64K Words, EtherNet/IP","metaDescription":"Omron CJ2M-CPU31 CPU with built-in EtherNet/IP port, 64K word memory, expandable to 40 modules. Active production. Sourced to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"title":"CJ2M-CPU31","Series":"CJ2M","Weight":"0.419 lb (190.06 g)","Package":"Box","Features":"Battery Backup","Software":"CX-One","Expandable":"40 Modules (3 Racks) Max","Memory Size":"64K Words","description":"CPU with built-in EtherNet/IP port","Display Type":"No Display","Mounting Type":"DIN Rail","Communications":"Ethernet, USB, Option Cards Available","Approval Agency":"CE, cULus, Lloyd, NK","lifecycle_stage":"mature","Operating Temperature":"0°C~55°C"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$348.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What are the key specifications of the CJ2M-CPU31?","answer":"It has 64K words of program memory, a built-in EtherNet/IP port, and supports up to 40 modules across 3 expansion racks. It includes battery backup, runs on CX-One software, and mounts on a DIN rail with an operating range of 0°C to 55°C."},{"question":"What approvals does the CJ2M-CPU31 carry?","answer":"The CJ2M-CPU31 is approved by CE, cULus, Lloyd's Register, and Nippon Kaiji Kyokai (NK), covering industrial control and marine applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/CJ2M-CPU31","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/CJ2M-CPU31 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}}