{"product_id":"omron-cj2m-cpu31-cpu-module-cj2m-series","title":"Omron CJ2M-CPU31 CPU Module CJ2M Series","description":"\u003cp\u003eThe \u003cstrong\u003eOmron CJ2M-CPU31\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eCJ2M-CPU31\u003c\/strong\u003e CPU Unit, operates as a dedicated hardware component for centralized logic control and industrial ethernet communication execution within Omron CJ2M Series automation systems.\u003c\/p\u003e\n\u003ch3\u003eTechnical Identifier Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Part Number:\u003c\/strong\u003e CJ2M-CPU31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries Architecture:\u003c\/strong\u003e CJ2M Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Classification:\u003c\/strong\u003e CPU Unit with built-in EtherNet\/IP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompliance Standards:\u003c\/strong\u003e UC1, N, L, CE\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure\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\u003eCJ2M-CPU31\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eOmron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.19 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Dimensions\u003c\/td\u003e\n\u003ctd\u003e9.0 cm x 6.2 cm x 8.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e14.0 cm x 10.0 cm x 11.0 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.70 A at 5 VDC (700 mA Backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgram Capacity\u003c\/td\u003e\n\u003ctd\u003e5K steps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e16 Inputs (Local) \/ Up to 2560 bits total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLD Instruction Execution Time\u003c\/td\u003e\n\u003ctd\u003e0.04 us\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Mountable Units\u003c\/td\u003e\n\u003ctd\u003e40 units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntegrated Interfaces\u003c\/td\u003e\n\u003ctd\u003eBuilt-in EtherNet\/IP port, USB port, Option Board slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrounding Standard\u003c\/td\u003e\n\u003ctd\u003eLess than 100 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003ePanel mount \/ DIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP Determinism and Backplane Bus Velocity\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eOmron CJ2M-CPU31\u003c\/strong\u003e features an integrated EtherNet\/IP communication stack that handles cyclic implicit message exchanges and explicit messaging independently from the primary execution core. Real-time deterministic control is maintained alongside an LD instruction execution speed of 0.04 us per instruction.\u003c\/p\u003e\n\u003cp\u003eThe backplane interface manages communication velocity for up to 40 mountable expansion units, preventing processing overhead bottlenecks during high-density I\/O scans. An internal current draw of 0.70 A at 5 VDC is drawn directly from the system power supply module. Firmware flash architecture supports onboard peripheral expansion via the dedicated front option board slot for serial or pulse I\/O extensions.\u003c\/p\u003e\n\u003ch3\u003ePackage Contents \u0026amp; Ordering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Omron CJ2M-CPU31 CPU Unit\u003c\/li\u003e\n\u003cli\u003e1x CJ1W-BAT01 Backup Lithium Battery\u003c\/li\u003e\n\u003cli\u003e1x Protective USB Slot Cap\u003c\/li\u003e\n\u003cli\u003e1x Hardware Instruction Sheet\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCabinet Mounting:\u003c\/strong\u003e Secure the processor onto a standard 35 mm DIN rail or panel surface inside an IP54-rated metal enclosure. Ensure a minimum vertical clearance of 30 mm above and below the housing for proper heat dissipation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Connection:\u003c\/strong\u003e Slide the unit horizontally against the adjacent power supply module. Engage the top and bottom slider catches until an audible click confirms positive locking of the backplane bus pins.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctional Grounding:\u003c\/strong\u003e Connect a dedicated ground wire (2.0 mm sq. minimum) from the system power supply module functional ground (FG) terminal to earth ground. Maintain total path resistance below 100 ohm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEtherNet\/IP Cabling:\u003c\/strong\u003e Connect Category 5e or Category 6 STP ethernet cabling to the RJ45 port. Route communication cables in dedicated conduits separated from high-voltage AC motor wires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBraid Shielding:\u003c\/strong\u003e Connect the RJ45 shield ground to the enclosure grounding infrastructure using a 360-deg braid shield configuration to attenuate high-frequency industrial noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the execution speed of a standard basic LD instruction on the CJ2M-CPU31?\u003c\/p\u003e\n\u003cp\u003eThe controller executes basic ladder logic (LD) instructions at a minimum speed of 0.04 us per instruction.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat current load does the CJ2M-CPU31 draw from the internal 5 VDC backplane supply?\u003c\/p\u003e\n\u003cp\u003eThe module draws 0.70 A (700 mA) at 5 VDC directly from the rack power supply via the internal backplane bus.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow many maximum mountable units are supported by this CPU processor?\u003c\/p\u003e\n\u003cp\u003eThe architecture supports connections for up to 40 mountable expansion units across the system expansion racks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat communication interfaces are integrated natively onto the front panel of the CPU?\u003c\/p\u003e\n\u003cp\u003eThe CPU features a built-in EtherNet\/IP port, a USB programming connector, and one slot for optional communication daughter boards.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the user program memory capacity of the CJ2M-CPU31?\u003c\/p\u003e\n\u003cp\u003eThe user memory allocation accommodates a total program capacity of up to 5K steps.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan the CJ2M-CPU31 CPU unit be installed or removed while the backplane is energized?\u003c\/p\u003e\n\u003cp\u003eNo, main input power to the rack power supply module must be disconnected prior to inserting or removing the CPU unit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat international safety and industrial standards does the module meet?\u003c\/p\u003e\n\u003cp\u003eThe hardware complies with UC1, N, L, and CE certification marks for industrial control equipment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum functional ground loop resistance allowed during installation?\u003c\/p\u003e\n\u003cp\u003eThe single-point functional grounding system must maintain a ground loop resistance of less than 100 ohm.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Omron","offers":[{"title":"Default Title","offer_id":47306632036525,"sku":"CJ2M-CPU31","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/omron_cj2m-cpu31_3.jpg?v=1788412414","url":"https:\/\/www.maxwellplc.com\/products\/omron-cj2m-cpu31-cpu-module-cj2m-series","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}