BARDH ZEKA Posted January 21, 2020 Report Share Posted January 21, 2020 HI. I WANT TO CONTROL A ANYHZ CHINESE VFD WITH A UNITRONICS V430 PLC UNIS MODBUS COMMUNICATION ITS MY FIRST TIME OF USING MODBUS, CAN ANYONE HELP ME. Quote Link to comment Share on other sites More sharing options...
DanT Posted January 21, 2020 Report Share Posted January 21, 2020 HI; How are you going to communicate with the VFD? ( Modbus RTU (Serial) or Modbus TCP (Ethernet) ) ???? Do you have a communications card in the V430? Which one ? The USB Programming Port in the V430 is for Programming ONLY, not for communicating to other devices. In VisiLogic under Help, there are Example programs Look for the Communications and Modbus. Open and understand them and read the Modbus Help in the Help data. Learn how MODBUS works. In the Manual for the VFD Review how to communicate with the VFD over Modbus Locate and understand the registers you need to work with. Get the communications setup working. Write a simple program to communicate with the VFD. Post your issues and program. People can guide you. DanT Quote Link to comment Share on other sites More sharing options...
MVP 2022 Joe Tauser Posted January 21, 2020 MVP 2022 Report Share Posted January 21, 2020 1 hour ago, BARDH ZEKA said: ITS MY FIRST TIME OF USING MODBUS, CAN ANYONE HELP ME. 1. Start by looking at the Modbus programs in the Examples. Then read about the Modbus protocol - http://modbus.org/docs/PI_MBUS_300.pdf - so you know what it is you are trying to accomplish. 2. Post a link to the modbus information for the VFD you're trying to talk to. 3. Determine what the physical connection to the drive is - RS485, RS232, or Ethernet. Then figure out how to wire it. 4. Try writing a program yourself based on all the above. 5. Post your code and ask specific questions. Do NOT ask for an example specific to your application. We're here to help, but it's up to you to figure it out. Joe T. Quote Link to comment Share on other sites More sharing options...
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