OMRON CJ1M-CPU23 PLC CPU Unit – 9‑pin Serial Port
The OMRON CJ1M-CPU23 is a higher‑capacity CPU unit in the CJ1M series, providing 10K program steps and expanded data memory. It features a standard 9‑pin D‑sub RS‑232C serial port for programming and communication, making it a versatile choice for medium‑sized control systems requiring more logic and data handling.
Processor and Memory
CPU: 32‑bit RISC at 20 MHz. Program capacity: 10K steps (ladder logic). Data memory: 8K words (DM) and 2K words (EM). Includes a real‑time clock with battery backup (lithium coin cell).
Built‑in I/O and Ports
Integrates 16 digital inputs (24 VDC) and 8 transistor outputs (PNP, 0.3 A). One RS‑232C port (9‑pin D‑sub) supports programming, host link (Modbus), or no‑protocol communication. An additional RS‑422/485 port is available via an optional adapter.
Performance
Basic instruction execution: 0.5 µs; application instructions: 2‑20 µs. Scan time typical 3‑8 ms depending on program size.
Programming and Software
Programmed with CX‑Programmer (or SYSMAC‑CPT) with full online editing and debugging. Supports function blocks and structured text.
Diagnostic Functions
LED indicators for power, run, error, and serial communication. Built‑in self‑diagnostics (watchdog, memory check, bus check).
Environmental and Electrical
Operating temperature: 0 to 55°C, storage: ‑20 to 70°C. Humidity: 10‑90% non‑condensing. Power: 5 VDC backplane (300 mA). Dimensions: 90 mm × 65 mm × 70 mm, weight 220 g.
Compatibility
Works with all CJ1 series I/O and special modules (analog, temperature, motion, communication).
Applications
Suitable for assembly machines, packaging equipment, material handling, and small process control.
Installation and Maintenance
Insert into CJ1 rack, connect serial cable for programming. Battery replacement every 5 years (CR2032). Firmware updates via serial.
Certifications
CE, UL, and CSA approved. Complies with IEC 61131‑2.
In summary, the CJ1M‑CPU23 provides expanded memory and I/O, making it a robust CPU for more demanding automation tasks with reliable serial communication.
