OMRON SYSMAC C20 PROGRAMMABLE CONTROLLER,Omron C20-CPU44-E 3G2C7-CPU44-E SYSMAC C20 Programmable Controller 200 – Next Day Automation,OMRON SYSMAC C20 Programmable Controller Type C20-CPU74E 3G2C7-CPU74E Loc D3 //,Omron C20K, C28K, C40K, C60K Troubleshooting - YouTube,Need help accessing the program on an old C20 controller - Other Omron Software - MrPLC.com