CJ2M-CPU31 Omron Modular PLC CPU

The Omron CJ2M-CPU31 is a high-performance PLC CPU offering built-in EtherNet/IP communication, advanced memory capacity, and fast processing speeds in a compact footprint. Designed for modular control systems, it supports up to 2560 I/O points, 25K steps program capacity, and 64K words of data memory, making it ideal for scalable machine and process control.

Featuring a USB programming port and an option slot for serial communications (RS-232C or RS-485), this controller is a versatile and reliable choice for OEMs and industrial automation integrators.

Technical Specifications

Model: Omron Sysmac CJ2M-CPU31
Series: CJ2M
Product Type: Modular PLC CPU
Mounting Type: DIN rail or panel-mounted (with CJ2 base)
Weight (Unpacked): 190 g
Dimensions (W × H × D): 62 × 90 × 84.5 mm
Protection Rating: IP20 (panel enclosure required)

CPU & Memory

• Program Capacity: 25K steps
• Data Memory: 64K words
• EM Memory: 32K words × 1 bank
• Logic Execution Time: 0.04 µs/step
• Expansion Racks Supported: 3
• Max. Expansion Units: 40
• Max. Local I/O Points: 2560
• Built-in Digital I/O: None (modular I/O required)

Communication Interfaces

• EtherNet/IP / TCP/IP: 1 × 10/100Base-TX port
• USB Type B: 1 (for programming)
• Option Slot: Supports Omron serial communication modules (RS-232C / RS-485 / RS-422)
• Programming Software: CX-Programmer (Sysmac Studio optional)
• Supported Communication: FINS, Modbus RTU (via serial), EtherNet/IP tag data links, FTP, SNMP, sockets

Mechanical & Installation

• Installation Method: Snap-in on DIN rail with backplane
• Compatible Modules: CJ2M I/O, analog, motion, temperature, and communication units
• Cooling Method: Natural convection (no fan required)

Environmental & Compliance

• Operating Temperature: 0 to 55°C
• Storage Temperature: –25 to 70°C
• Humidity Range: 10–90% RH (non-condensing)
• Altitude: Up to 2000 m
• Vibration/Shock Resistance: Compliant with IEC 60068-2-6 / IEC 60068-2-27
• Certifications: CE, cULus, RCM

Applications

Ideal for:

• Medium-scale machine control
• Process automation and distributed systems
• Modular packaging and bottling lines
• Printing, labeling, and food machinery
• Remote monitoring with EtherNet/IP

Key Features & Benefits

✅ 25K Program Steps: Efficient for mid-sized machine logic.

✅ Built-in EtherNet/IP: Seamless integration with HMI, SCADA, and drives.

✅ USB & Serial Options: Flexible programming and third-party device connection.

✅ Scalable I/O: Expand up to 2560 I/O points.

✅ Fast Execution: 0.04 µs per basic instruction for high-speed applications.

📦 Available from Drive Outlet Megastore

The Omron CJ2M-CPU31 provides a cost-effective yet powerful PLC CPU with built-in networking and flexible expansion. Ideal for control system designers looking to scale and integrate with confidence.

Need help building a CJ2M-based control system? Contact our PLC experts today.

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