SKU: CJ1M-CPU21

Omron CJ1M-CPU21 CJ1M Series PLC CPU Unit

Omron CJ1M-CPU21 is a CJ1M series PLC CPU unit with built-in pulse I/O for compact machine control with positioning capability.

USD 180.00 per unit, volume discounts available

In stock, ships in 24h
100% genuine Omron
1-year manufacturer warranty
Worldwide delivery

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Key Features

5K steps program capacity
160 I/O points maximum
Built-in high-speed counter
Pulse output for positioning
Compact modular design
Compatible with CJ series I/O modules
Multiple communication options
Cost-effective solution

Reliable Compact Controller for Cost-Effective Automation

The Omron CJ1M-CPU21 is a CPU unit from the CJ1M series, a popular mid-range programmable logic controller family known for reliability and cost-effectiveness. This CPU provides 5K steps of program memory with capacity for up to 160 I/O points, making it suitable for small to medium automation applications. The CJ1M-CPU21 features built-in high-speed counter functionality and pulse output capabilities, ideal for positioning and motion control applications. Its compact design and modular architecture allow flexible configuration with CJ series I/O modules. Programming is done via CX-Programmer, providing a comprehensive development environment for logic, positioning, and network configuration.

Typical Applications

Small packaging machinery
Simple assembly automation
Conveyor control systems
HVAC control
Pump and motor control
Lighting control systems

Buying Checklist

Ideal for applications needing up to 160 I/O points
Verify program capacity meets application needs
Confirm communication options required
Check power supply type compatibility

Technical Specifications

Technical specifications for Omron CJ1M-CPU21 CJ1M Series PLC CPU Unit
Model	CJ1M-CPU21
Series	CJ1M
Type	PLC CPU Unit
Program Capacity	10K steps
Data Memory	8K words
Built-in Pulse I/O	2-axis 100kHz
Max I/O Points	256 points
LD Instruction Time	0.1μs
Built-in Ports	RS-232C
Expandable Units	Up to 10 units
Battery Life	5 years
Operating Temperature	0 to +55°C

Frequently Asked Questions

What's the difference between CJ1M-CPU11, CPU12, and CPU21?

Program capacity: CPU11=2.5K, CPU12=5K, CPU21=10K steps. All have built-in pulse I/O. Choose based on program size requirements.

Can this CPU control stepper motors?

Yes, built-in 100kHz pulse output suitable for stepper motor control. Use pulse/direction signals. For servo motors, same pulse output works with servo drives accepting pulse input.

What positioning functions are available?

Independent positioning, speed control, home return. Programmed via PLC positioning instructions. For complex motion (interpolation), add CJ1W-NC position control unit.

Is this CPU suitable for retrofit projects?

Yes, CJ1M is commonly used for retrofitting older C200H or CQM1 systems. Compatible with many existing I/O modules. Compact size fits in existing panels.