Omron CQM1H‑CPU21 CQM1H Series PLC CPU Unit

The Omron CQM1H‑CPU21 is a compact modular PLC CPU from the CQM1H family, designed for mid‑range machine automation. It comes with built‑in 16 DC inputs and an RS‑232C port, supporting up to 256 I/O points for flexible small‑and‑medium control systems.

This unit has been discontinued by Omron. It is widely supplied as aftermarket spare parts for maintenance and retrofitting of existing packaging, material handling and assembly production lines. CX‑Programmer software is adopted for programming and online debugging.

Main Specifications

1. Brand: Omron; Model:CQM1H‑CPU21; Type:CQM1H Series PLC CPU Unit
2. Program Memory:3.2K words, Data Memory:3K words, Max I/O points:256
3. Built‑in I/O:16‑point DC24V digital input, equipped with RS‑232C communication port
4. Installation:DIN rail mounting, rack‑less modular expansion structure
5. Programming Software:CX‑Programmer, supports PID and advanced instruction set
6. Certification:UL, CSA, CE; Operating temperature:0℃ ~ +55℃
7. Supply Status:Original production discontinued, available as tested surplus or refurbished spare parts

Core Functions

1. Execute ladder logic control programs and process digital signals from field sensors and actuators.
2. Realize data exchange with HMI, inverters and upper computers via RS‑232C serial communication.
3. Support PID regulation, high‑speed counting and pulse control for continuous process control.
4. Complete modular I/O expansion to adapt to different automation equipment configuration requirements.
5. Built‑in self‑diagnosis function to detect operation faults and record error information.
6. Stable cyclic scanning control for small and medium‑size automated machinery and production lines.

Application Scenarios

1. Control system for packaging machines, conveyor lines, automatic assembly and food processing equipment.
2. Spare CPU replacement and routine maintenance of existing Omron CQM1H automation racks.
3. Technical renovation and reliability upgrade of old‑generation factory automation production lines.
4. On‑site troubleshooting and replacement of failed PLC CPU units on running machinery.
5. Spare‑parts stocking for system integrators and industrial automation maintenance contractors.
6. Global aftermarket spare supply for technicians maintaining obsolete Omron CQM1H PLC hardware.

FAQ

1. Q: What software is used to program CQM1H‑CPU21?
   A: It adopts Omron CX‑Programmer for programming, online monitoring and fault diagnosis.
2. Q: What is the maximum I/O capacity of this CPU?
   A: The maximum expandable I/O points reach 256, suitable for medium‑sized machine control.

3. Q: Is this PLC still in production?
   A: Omron has discontinued this model, only tested surplus and refurbished spare units can be supplied.