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Part of the Omron CJ-Series PLCs series — see the full model table, lifecycle status and replacement parts.

Omron CJ2M-CPU31 — front view of the CJ2M CPU3x showing the Omron model label, the RUN / ERROR / INH LED indicators, the seven-segment display, the USB Type-B programming port and the EtherNet/IP RJ45 port along the lower face

Omron CJ2M-CPU31 — CJ2M CPU, 5K Steps, EtherNet/IP

SKU: CJ2M-CPU31

USD 260.00

Omron CJ2M-CPU31 CJ2M CPU with built-in EtherNet/IP, 5K-step program, 64K data memory, option board slot. In stock.

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Product Overview

The Omron CJ2M-CPU31 is the entry unit in the CJ2M CPU3x lineup, manufactured by Omron Corporation. Hengyixin Automation stocks this controller in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports.

Program capacity is 5K steps plus 20K steps of function-block memory. Data memory is 64K words, split as 32K words DM plus 32K words EM in one bank. The CPU addresses up to 2560 local I/O across 40 mountable units and three expansion racks. Basic LD instruction execution is 0.04 microseconds. Built-in ports are EtherNet/IP and USB, plus an option board slot for CP1W-CIF01 (RS-232C) or CP1W-CIF11 / CP1W-CIF12-V1 (RS-422A/485).

Current draw is 5 V at 0.7 A. The unit is 90 x 62 x 84.5 mm and weighs 190 g. Programming runs in CX-Programmer. For the same 5K steps without EtherNet/IP, pick the CJ2M-CPU11. For more program, pick the CJ2M-CPU32 (10K steps) or CJ2M-CPU34 (30K steps). Add a CJ2M-MD211 for high-speed counter and pulse outputs.

Key Features

  • CJ2M CPU3x with 5K-step program plus 20K-step function-block memory
  • 64K-word data memory (DM 32K + EM 32K x 1 bank), 0.04 us LD instruction execution
  • Built-in EtherNet/IP and USB ports; option board slot for CP1W-CIF01 / CIF11 / CIF12-V1
  • 2560 I/O points across 40 units and 3 expansion racks, 5 V 0.7 A, 90 x 62 x 84.5 mm, 190 g
  • SKU: CJ2M-CPU31
  • Series: Omron CJ2M-series CPU Unit (CPU3x line, built-in EtherNet/IP)
  • I/O: 2560 points

Best-Fit Applications

  • Compact packaging machine where the cabinet needs EtherNet/IP for the HMI and the program is under 5K steps
  • Spare CPU drop-in for a CJ2M rack where the field bus is EtherNet/IP and a CP1W-CIF11 fills the option board slot
  • Small cell controller wired to a CJ1W-PA202 power supply and a handful of CJ1W-ID211 input units on the same rack

Buying Checklist

  • Pick the CJ2M-CPU31 for the entry CJ2M CPU3x with built-in EtherNet/IP and an option board slot for serial comms.
  • Pick the CJ2M-CPU32 instead when 10K steps of program capacity is enough and the rest of the spec is the same.
  • Pick the CJ2M-CPU11 instead when the cabinet has no EtherNet/IP and the option board slot is not needed.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron CJ2M-series CPU Unit (CPU3x line, built-in EtherNet/IP)
Model / SKU CJ2M-CPU31
Program Capacity 5K steps + 20K steps function-block memory
Data Memory 64K words (DM 32K words + EM 32K words x 1 bank)
LD Execution Time 0.04 us (basic instruction)
Local I/O / Mountable Units 2560 points / 40 units / 3 expansion racks
Built-in Communication EtherNet/IP (RJ45) + USB; option board slot for CP1W-CIF01 / CIF11 / CIF12-V1
Current Consumption 5 VDC, 0.7 A
Compatible I/O Family CJ1W-series Basic I/O, Special I/O, and CPU Bus Units
Programming Software CX-Programmer (CX-One suite)
Dimensions / Weight 90 (H) x 62 (W) x 84.5 (D) mm; 190 g

FAQ for CJ2M-CPU31

What is the difference between CJ2M-CPU31 and CJ2M-CPU11?
Both have 5K steps of program. The CPU31 is on the CPU3x line with built-in EtherNet/IP and an option board slot. The CPU11 is on the CPU1x line with RS-232C + USB only and no option board slot.
How much current does the CJ2M-CPU31 draw?
0.7 A at 5 VDC from the rack power supply. Add 0.005 A, 0.030 A or 0.075 A when the CP1W-CIF01, CIF11 or CIF12-V1 option board is fitted.
Does the CJ2M-CPU31 support expansion racks?
Yes. Up to three expansion racks through a CJ1W-IC101 I/O control unit on the right side of the CPU and CJ1W-II101 interfaces on each expansion rack.

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