CJ1M-CPU21 Omron ⍾ 204819 ⍾ CJ1MCPU21

CPU, 10K steps program, 32K words data memory, 320 I/O max, serial PLC link, built-in I/O, 4 interrupt inputs, 2 high speed counters, 2 pulse outputs

CPU, 20K steps program, 32K words data memory, 640 I/O max (with 1 expansion rack), serial PLC link, built-in I/O, 4 interrupt inputs, 2 high speed counters, 2 pulse outputs

CPU, 5K steps program, 32K words data memory, 160 I/O max, serial PLC link