OMRON CJ2H-CPU65 CPU Unit

The OMRON CJ2H-CPU65 is a high‑performance CPU unit from the CJ2H series of programmable logic controllers. Designed for advanced machine and process control, this CPU offers exceptional processing speed, large program memory, and built‑in motion control capabilities. It supports up to 250,000 program steps, making it suitable for complex automation tasks that require extensive logic, data handling, and network communication.

The CPU features a dual‑port memory architecture and a high‑speed backplane bus, enabling rapid I/O refresh and deterministic response times. It includes a built‑in Ethernet port for programming and network integration, as well as a USB port for fast program transfer. The CJ2H‑CPU65 supports OMRON’s CJ series expansion modules, allowing scalable I/O configurations up to several thousand points. Its real‑time clock and battery‑backed memory ensure data retention and accurate time‑stamping.

Technical Specifications

• Model: CJ2H-CPU65

• Program memory: 250 K steps (ladder logic)

• Data memory: 512 KB (retentive via battery)

• Execution speed: 0.02 µs per basic instruction

• Motion control: Integrated (up to 64 axes with optional units)

• Built‑in communication: 1 x Ethernet (100BASE‑TX), 1 x USB (programming), 1 x RS‑232C (optional)

• I/O capacity: Max 2560 points (local + remote via EtherCAT)

• Interrupt inputs: Up to 32 (configurable)

• Timer/Counter: 1024 each

• Battery backup: Yes (for data and clock)

• Power supply: 5 V DC, 1.2 A (from backplane)

• Operating temperature: 0°C to +55°C

• Dimensions: 90 x 65 x 85 mm (H x W x D)

• Certifications: CE, UL, RoHS

Key Functional Features

• High‑speed processing: With a cycle time as low as 0.2 ms per 1,000 instructions, the CPU handles large programs with ease.

• Integrated motion: Direct control of servo and stepper axes using OMRON’s advanced motion function blocks, reducing programming effort.

• Ethernet/IP and Modbus TCP support: The built‑in Ethernet port enables seamless communication with SCADA, HMIs, and third‑party devices.

• Security features: User authentication and IP filtering protect against unauthorized access.

• Self‑diagnostic: The CPU monitors its own operation and logs errors, facilitating predictive maintenance.

Typical Applications

• High‑speed packaging lines: Synchronizing multiple axes and I/O for wrapping, sealing, and labeling.

• Printing and converting: Coordinating web tension and register control.

• Automated assembly cells: Controlling robots, conveyors, and testing equipment.

• Process control: Managing batch sequences with complex recipes and data logging.

Integration and Programming

The CJ2H-CPU65 is programmed using OMRON’s CX‑Programmer or Sysmac Studio software. The CPU supports ladder, structured text, and sequential function chart languages. I/O addresses are automatically assigned, and the built‑in Ethernet port allows connection to the engineering workstation. The CPU also supports OPC UA server functionality for secure data exchange with IT systems. Online debugging includes forcing I/O, monitoring variables, and tracing execution.

Installation Notes

Mount the CPU in the designated slot (slot 0) of the CJ2 rack. Connect the power supply, and ensure the battery is installed for data retention. The Ethernet port uses a standard RJ45 cable; the USB port connects to a PC for high‑speed program download. The CPU features a run/stop switch and status LEDs for power, run, and error. No external wiring is required for the CPU itself, except for the communication ports.

Compliance

The CJ2H-CPU65 complies with EN 61131‑2, EN 61000‑6‑2/‑4, and carries CE and UL marks. It is RoHS compliant and rated for pollution degree 2.

Conclusion

The OMRON CJ2H‑CPU65 is a powerful, feature‑rich CPU unit for high‑performance automation systems. Its large memory, fast processing, and integrated motion control make it a top choice for demanding machine control applications.