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

Omron CJ2M-CPU12 — front face of the 31 mm wide CPU showing the model label, the RS-232C D-Sub 9-pin serial port, the USB mini-B programming port, the green PWR / RUN / ERR LED stack and the rotating mode switch

Omron CJ2M-CPU12 — 10K-Step PLC CPU, RS-232C + USB

SKU: CJ2M-CPU12

USD 135.00

Omron CJ2M-CPU12 10K-step CJ2M-series PLC CPU for the CJ I/O Bus, 64K data memory, RS-232C + USB, 2560 I/O max, CX-Programmer.

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Product Overview

The Omron CJ2M-CPU12 is a 10K-step CPU unit for the CJ2M series of modular PLCs, 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.

The CPU holds 10K steps of program and 64K words of data memory, and runs ladder-logic instructions in 0.04 microseconds. It scans up to 2560 local I/O points across 40 units on the CJ bus and supports 3 expansion racks. On-board ports are RS-232C for serial devices and USB for PC programming; there is no built-in Ethernet on this CPU.

Programming runs in CX-Programmer under CX-One. The CJ1W-BAT01 battery backs the real-time clock and retentive areas. Pulse-I/O modules CJ2M-MD211 or CJ2M-MD212 add high-speed counters and pulse outputs. For built-in EtherNet/IP on a 10K-step CPU, pick the CJ2M-CPU33. For the smaller 5K-step model, pick the CJ2M-CPU11. End of production is scheduled for 2027-06-30.

Key Features

  • 10K-step CJ2M-series CPU for the CJ I/O Bus, 64K words total data memory
  • 0.04 microsecond LD instruction execution, up to 2560 I/O points across 40 units and 3 expansion racks
  • Built-in RS-232C serial port and USB programming port, no built-in Ethernet
  • Pulse-I/O ready: pairs with CJ2M-MD211 (NPN) or CJ2M-MD212 (PNP) for high-speed counters and pulse outputs
  • SKU: CJ2M-CPU12
  • Series: Omron CJ2M-series CPU Unit
  • I/O: 2560 points

Best-Fit Applications

  • Replacing a CJ1M-CPU11 in a packaging line where the existing program is roughly 5-8K steps and only the higher step count is needed
  • Running a small filling-and-capping machine where RS-232C talks Host Link to the operator panel and USB programs from a bench laptop
  • Mid-sized conveyor cell where 2560 I/O points covers three local racks of digital inputs and outputs on the same CJ bus

Buying Checklist

  • Pick the CJ2M-CPU12 for a 10K-step CJ2M CPU without built-in Ethernet and with RS-232C plus USB on the front face.
  • Pick the CJ2M-CPU11 instead when the program fits in 5K steps and a lower-cost CPU is acceptable.
  • Pick the CJ2M-CPU33 instead when the cabinet needs built-in EtherNet/IP on the same 10K-step program capacity.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron CJ2M-series CPU Unit
Model / SKU CJ2M-CPU12
Function Modular PLC CPU, 10K steps, CJ I/O Bus
Program Capacity 10K steps
Data Memory 32K words DM + 32K words x 1 bank EM (64K words total)
LD Execution Time 0.04 microseconds
Max I/O Points 2560 points / 40 units / 3 expansion racks
Built-in Ports RS-232C (D-Sub 9-pin) and USB programming port
Built-in Ethernet No (use CJ2M-CPU3[] range for EtherNet/IP)
Backplane Current 5 VDC, 0.5 A
Dimensions / Weight 31 x 90 x 84.5 mm; 130 g

FAQ for CJ2M-CPU12

What is the Omron CJ2M-CPU12 used for?
It is the CPU for a CJ2M modular PLC rack. It runs the ladder-logic program, scans the CJ I/O Bus, holds 64K words of data memory, and exposes one RS-232C port and one USB programming port on the front face.
CJ2M-CPU12 vs CJ2M-CPU11 — what is the difference?
Program capacity. The CPU12 holds 10K steps, the CPU11 holds 5K steps. Both share the same 64K words of data memory, the same 0.04 microsecond LD execution time, and the same RS-232C + USB port layout.
Does the CJ2M-CPU12 have built-in Ethernet?
No. For built-in EtherNet/IP on a 10K-step CPU, use the CJ2M-CPU33. The CPU12 talks serial only and adds EtherNet/IP through a CJ1W-ETN21 Ethernet unit on the CJ bus.
What software programs the CJ2M-CPU12?
CX-Programmer, current release 9.x, running under the CX-One suite. Projects upload over the front USB port and run on the internal flash memory with no battery needed for the program itself.
Is the CJ2M-CPU12 still in production?
Yes as of mid-2026, but Omron has announced end of production on 2027-06-30. Stock is still widely available from authorised distributors; for new designs consider the Sysmac NJ101-1000 or NJ101-9000.

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