OMRON CJ1M-CPU22 PLC CPU Unit – Firmware V2.0

The OMRON CJ1M-CPU22 is a compact CPU unit for the CJ1M series programmable logic controllers. It offers a balance of processing power, memory, and built‑in I/O, making it suitable for small to medium automation systems. Version 2.0 firmware includes enhanced PID functions and increased memory capacity.

Processor and Memory

CPU: 32‑bit RISC, operating at 20 MHz. Program capacity: 5.7K steps (ladder instructions). Data memory: 4K words (DM) and 1K words (EM). The unit includes a real‑time clock with battery backup for time‑stamped events.

Built‑in I/O and Interfaces

Integrates 10 digital inputs (24 VDC) and 6 transistor outputs (PNP, 0.3 A). Also provides one RS‑232C port (for programming/Modbus) and one RS‑422/485 port (for networking). Expansion I/O modules can be added via the CJ1 backplane.

Execution Speed

Basic instructions: 0.5 µs; application instructions: 2‑10 µs. Scan time is typically 2‑5 ms for average programs.

Programming and Software

Programmed with CX‑Programmer (or SYSMAC‑CPT) using ladder, function block, and structured text. Online editing and monitoring are supported.

Diagnostic Features

Status LEDs for power, run, error, and communication. Self‑diagnostics include watchdog timer, memory verification, and I/O bus checks.

Environmental Data

Operating temperature: 0 to 55°C, storage: ‑20 to 70°C. Humidity: 10‑90% non‑condensing. Power: 5 VDC from backplane (250 mA). Dimensions: 90 mm × 65 mm × 70 mm, weight 200 g.

Compatibility

Compatible with all CJ1 series I/O modules (digital, analog, communication, motion). Up to 10 modules can be connected.

Applications

Used in packaging machines, conveyors, small process systems, and building automation.

Installation and Maintenance

Plug into designated slot in CJ1 rack. Battery replacement (CR2032) required every 5 years. Firmware updates via serial port.

Certifications

CE and UL recognized. Complies with IEC 61131‑2.

In summary, the CJ1M‑CPU22 provides a cost‑effective, reliable CPU solution with essential features for moderate‑sized control tasks.