USD 1,290.82
Compact CJ-series CPU with EtherNet/IP, 2,560-point I/O capacity, 5K steps, USB, RS-232C, and 31 mm width.
CJ2M-CPU31 is an Omron CJ-series CPU unit with built-in EtherNet/IP functionality, intended for modular machine control systems. Official Omron literature identifies it as a CJ2M CPU Unit with 2,560 I/O points / 40 units, 5K-step program capacity, built-in USB and RS-232C, and a compact 31 mm-wide form factor in the CJ2M CPU family. Distributor and manufacturer pages consistently identify the exact manufacturer part number as CJ2M-CPU31.
| Parameter | Value |
|---|---|
| I/O Capacity / Mountable Units | 2,560 points / 40 units (3 expansion racks max.) |
| Program Capacity | 5K steps |
| Built-in Ethernet | Yes (EtherNet/IP functionality) |
| Built-in USB | Yes |
| Built-in RS-232C Port | Yes |
| Unit Size (HxWxD) | 90 x 31 x 84.5 mm |
| CPU Unit Dimensions | 90 mm × 75 mm × 31 mm |
| Function Block Definitions | 256 |
| Data Tracing Memory | 8K words |
| Source/Comment Memory | 1 Mbyte |
| LD Instruction Execution Time | 40 ns |
The 5K-step program capacity, compact 31 mm width, and CJ-series modular expansion make it suitable for small assembly cells that need a space-efficient central CPU with field networking.
Provides reliable control in a tight panel footprint while supporting enough I/O for compact discrete automation.
Built-in EtherNet/IP functionality and modular rack support make it a good fit for conveyor segments and transfer systems that need PLC-to-PLC or PLC-to-HMI communication.
Eliminates the need for an external Ethernet option module while enabling networked line coordination.
The CPU’s built-in USB and RS-232C ports, along with CJ-series expandability, make it useful when replacing older control hardware while preserving serial device connectivity.
Maintains compatibility with serial instrumentation and simplifies maintenance/programming access during retrofit projects.
