Borec Posted April 12, 2019 Report Share Posted April 12, 2019 Hi all, it's my first post but I guess not least as I have a project to do using my Unitronics V1210 with CANOpen and 2 ports for Modbus RTU on board. I want to establish basic communication with my VFD (Vacon 100 / now Danfoss company) by Modbus RTU. 1. I bought RJ11 six pin plug and prepare junction so I have two cables - yellow at PIN1 and red at PIN6. 2. I connected PLC (Port 1) to VFD (A,B inputs) 3. I wrote a basic program to read the register 2101 (which is not 0 for sure) and... nothing happens. No communication. What I have checked: - Ports termination (set to RS485 with termination) - Galvanic connection between pins and end of the cable and it is ok - loopback test FB - no answer - ID, Baud Rate, Parity, Stop Bits - they are the same in drive and PLC I kindly ask if someone could check my ladder diagram as I have no idea what is wrong. KR, Bartosz Quote Link to comment Share on other sites More sharing options...
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