Posted 12 Jun 2019 Hello, I have Omron plc specifically CJ2m-CPU31 connected to Allen bradley powerflex 525. I wonder what command should i use to drive the frequency inverter and to change the frequency at a certain time. Any body can help me. Thanks in Advance. Share this post Link to post Share on other sites
Posted 17 Jun 2019 Hi Gerry, I always try to keep same controller brand and VFD brand when it comes to motion. Siemens with Siemens, Bosch with Bosch, AB with AB, ... If it is not possible, I setup a VFD with analog output signals on the PLC side in order to do speed control and start/stop commands with Discrete outputs. If it is possible for you setup, I would use that for plan A - it is easier to troubleshoot on the hardware side (a maintenance tech can use a multimeter in order to troubleshoot than an ethernet connection). If you need to control everything over ethernet IP (CIP) --- I know Omron PLC does ethernet/IP with EDS files as well (see video: https://www.youtube.com/watch?v=kza8Fthz7dY ) - only the tricky part is the correct data size and setup of the CIP message ( I added a sample of a different brand-- how you setup parameters correctly --- http://www.controltechnology.com/Files/common-documents/application_notes/Communicating-between-2500-Series-and-PowerFlex525 ). Also, Omron tech support is quite supportive and if you ask they will help you setting this up or they might have sample code. They helped me out on a similar matter with an EDS file. Hope this helps Share this post Link to post Share on other sites