Posted 18 Jan 2021 MY OMRON CJ1M CPU12 SHOWS UNIT NUMBER DUPLICATE ERROR. ERROR CODE IS 0X80E9. THE CPU HAS TWO NUMBER OF HIGH SPEED COUNTER IN A RACK SOME AND I/O UNITS. PLEASE HELP HOW TO SET MACHINE NUMBER (ROTARY SWITCH) IN OMRON CJ1W-CT021 IF TWO UNIT CONNECTED IN ONE CPU. PLEASE SEE ATTACHED PICTURE. CJ1W-CT021.bmp Share this post Link to post Share on other sites
Posted 18 Jan 2021 The Special I/O Units (Blue letters on part number on front of the card).The memory areas for the modules cannot overlap. Typically each special I/O module takes the space of one unit number. However, the CT021 uses 4 slots. If you have a unit #0 CT021 module, it uses the space reserved for unit #0 - 3 and the next module should be at unit #4 and would then use the space reserved for units 4-7. Share this post Link to post Share on other sites
