Jamie123 Posted March 30, 2018 Report Share Posted March 30, 2018 Hello, I have almost successfully established Modbus communication with a servo drive. I say almost, I cant read the register but I cant write to them. I want to change the speed via a button on the HMI. I get a -11 on the stats tag which is timed out. Could someone please have a look at the ladder for sending the modus write. Have I missed something? Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted April 1, 2018 MVP 2021 Report Share Posted April 1, 2018 Post a picture of your Modbus table I would first try making a Modbus entry with periodic timed read to see if the communication parameters and wiring was configured properly. Then worry about trying to call it from the ladder diagram. Joe T. Quote Link to comment Share on other sites More sharing options...
Jamie123 Posted April 3, 2018 Author Report Share Posted April 3, 2018 Thanks Joe, I made a school boy error of which I am too embarrassed to mention. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Ausman Posted April 3, 2018 MVP 2021 Report Share Posted April 3, 2018 Aw shucks Jamie, come on. Show us! Show us! cheers, Aus Quote Link to comment Share on other sites More sharing options...
Jamie123 Posted April 3, 2018 Author Report Share Posted April 3, 2018 Ok, I forgot to select "read" Dunce hat is on Quote Link to comment Share on other sites More sharing options...
MVP 2021 Flex727 Posted April 3, 2018 MVP 2021 Report Share Posted April 3, 2018 There are so many settings involved in network communications (with any PLC), that I don't think I've ever written a project from scratch where I didn't miss getting some setting right. Quote Link to comment Share on other sites More sharing options...
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