Omron CJ1M-CPU21 Programmable Logic Controller

The Omron CJ1M-CPU21 Programmable Controller is a compact PLC CPU unit for Omron CJ1M systems, delivering machine control and automation logic processing in small to medium industrial automation lines. It provides 10K steps of program memory and 32K words of data memory, supports up to 320 I/O points, and includes a peripheral RS-232C port with rack/backplane mounting powered from the rack. The controller offers high-speed processing (model dependent) and expandability for CJ1 series I/O and special modules, making it compatible with Omron CJ1M PLC systems in applications such as packaging machines, conveyors, assembly equipment, and other material handling or manufacturing processes where precise sequencing and monitoring are essential. Common replacements include CJ1M-CPU22, CJ2M-CPU31, and CQM1H-CPU51.