Posted 7 May 2020 Hello. I'm a newbie. First project. So I need to connect the inverter to PLC and I have used inverters RS485 port and PLCs inverter input. I have made sure the wiring is correct and used a 100 ohm resistor as was shown in the manual. At least I hope its correct. I have set most of the parameters as follows: P117 0 P118 192 P119 1 P120 2 P121 1 P122 9999 P124 0 P340 10 P502 0 P549 0 But still when I'm loading work on PLC then Module diagnostics is hitting me the error code H7602 that the communication has timed out and I don't know what to do. Is it my parameters? I have checked the parameters in the gx works 3 also so they matched and now I'm stumped. Please help Share this post Link to post Share on other sites
Posted 8 May 2020 Good day 1. What information and control do you require with the VFD? 2. You want to use the Modbus RTU protocol? Share this post Link to post Share on other sites
Posted 8 May 2020 Good day Here is a couple of important guidelines to use for the communication. I have also attached a document for communication between a CS VFD. The parameter setup and PLC setup will be the same. Hope this will help. iQF-Modbus 2019.pdf Share this post Link to post Share on other sites
Posted 8 May 2020 Thank you I have been using that schematics for the connection and I will triple check it again. But I'm reading it correctly that I don't have to use the pins 2 and 8? And I have to ground together 1 and 7 in the same terminal? Maybe I have mixed up the send receive terminals... But are the parameters that I have to but in the inverter correct? I need to use the VFD to control a motor (basic forward and backward movement in different speeds) through the operator panel. but thus far I can't get anyone speaking with each other, I suspect it's because I can't get PLC and the VFD communicating. Thank you in advance Share this post Link to post Share on other sites
Posted 8 May 2020 Did you read the PDF document I have sent you? All the parameters required is there and the plc programming to get the inverter to communicate. I have used this for a couple of setups and always work 100% Share this post Link to post Share on other sites