CJ2M-CPU31 SYSMAC CJ2M CPU Unit 5K Steps EtherNet/IP | Omron

The Original New Omron CJ2M-CPU31 is a compact CPU unit for the SYSMAC CJ series programmable logic controller (PLC) platform, featuring a built‑in EtherNet/IP port for seamless network integration. With a program capacity of 5K steps, 32K words of data memory, and 32K words × 1 bank of extended memory (EM), this CPU is designed for small to medium‑scale machine automation and OEM control systems. The integrated USB programming port simplifies connectivity, while the option board slot supports RS‑232C or RS‑485 serial communication modules for flexible field device integration. Up to 2,560 I/O points and three expansion racks allow scalable system expansion for packaging machinery, material handling, and general factory automation.

Product Status:
This product has been discontinued by Omron. It remains available as a spare part for maintaining existing installations while supplies last. For new designs, please consider the recommended replacement options.

Core Engineering Highlights:
5K steps program capacity | 32K words data memory + 32K words × 1 bank EM | Built‑in EtherNet/IP port (EtherNet/IP tag data links, FINS/TCP, FINS/UDP) | 0.04 μs LD instruction execution time | 2,560 max I/O points / 40 units / 3 expansion racks max | Option board slot for RS‑232C or RS‑485 serial communication | USB programming port | 5 V DC backplane power (0.7 A) | 62 × 90 × 84.5 mm | 190 g weight

Key Features:

• Original New Omron CJ2M-CPU31 CPU unit

• Built-in EtherNet/IP port supports tag data links and message communications

• 5K steps program capacity with 0.04 μs LD instruction execution time

• 32K words data memory (DM) plus 32K words × 1 bank extended memory (EM)

• Supports up to 2,560 I/O points and 40 units with 3 expansion racks max

• Integrated USB programming port for fast, direct PC connection

• Option board slot for RS-232C (CP1W-CIF01) or RS-422A/485 (CP1W-CIF11/CIF12-V1) serial communication modules

• Compatible with all existing CJ1 power supply, I/O, control, and communication units for easy migration

• Supports CJ-series I/O bus architecture

• DIN rail or panel mounting for flexible installation

• Battery backup for program and data retention

Applications:

• Small to medium machine automation and control systems

• Packaging machinery and OEM equipment

• Material handling and conveyor systems

• Factory automation and production line control

• Process monitoring and data acquisition

Technical Specifications:

System Compatibility:

• Compatible with SYSMAC CJ series I/O units, Special I/O Units, and CPU Bus Units

• Uses CJ-series I/O bus

• Mounts on CPU rack (CJ1W-BC series) with CJ1W-PA or CJ1W-PD series power supply

• Supports CJ1W-IC101 I/O control unit for multi-rack configurations

• Option board slot compatible with CP1W-CIF01 (RS-232C), CP1W-CIF11/CIF12-V1 (RS-422A/485)

• Programming software: CX-Programmer (CX-One) / Sysmac Studio

Related Products:

• CJ1W-PA205R – Power supply unit, 100-240 V AC, 25 W, with RUN output

• CJ1W-PA202 – Power supply unit, 100-240 V AC, 14 W

• CJ1W-PD025 – Power supply unit, 24 V DC, 25 W

• CJ1W-PD022 – Power supply unit, 24 V DC, 19.6 W

• CJ1W-IC101 – Expansion I/O control unit, connects to right side of CPU

• CJ1W-II101 – Expansion I/O interface unit, up to 3 expansion racks

• CP1W-CIF01 – RS-232C option board for serial communication

• CP1W-CIF11 – RS-422A/485 option board (non-isolated, 50 m max)

• CP1W-CIF12-V1 – RS-422A/485 option board (isolated, 500 m max)

• CJ2M-MD211 – Pulse I/O module for CJ2M (NPN)

• CJ2M-MD212 – Pulse I/O module for CJ2M (PNP)

• CJ1W-ID211 – 16-point DC input unit

• CJ1W-OD212 – 16-point PNP transistor output unit

• CJ1W-OC211 – 16-point relay output unit

• CS1W-CIF31 – USB-Serial conversion cable

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Omron and SYSMAC are trademarks of Omron Corporation.