DanT Posted January 16, 2015 Report Share Posted January 16, 2015 Hi; Has anyone worked with the Red Lion Ether-Trak I/O modules as remote I/O? Due to the Topology of the proposed system, the method of communication will be Modbus Serial RTU. Anyone done this before? Dan Thomas Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted January 20, 2015 MVP 2021 Report Share Posted January 20, 2015 I've never done Red Lion, but I have used other Modbus I/O modules. The trickiest part is building a stable RS-485 network. The Unitronics recommendations on the location of terminating resistors doesn't always work, as cable length can have a lot of effect on signal levels. If you connect your modules and you can't see them try turning on and off the terminator at the PLC and at the end of the run. Joe T. Quote Link to comment Share on other sites More sharing options...
DanT Posted January 20, 2015 Author Report Share Posted January 20, 2015 Hi Joe; Thanks for the response. There are some radios also involved and the RS485 section will be to the radio's, a short distance. Dan Thomas Quote Link to comment Share on other sites More sharing options...
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