mc controls Posted November 27, 2015 Report Share Posted November 27, 2015 Hi All, I have 3 Jazz PLC's communicating over Modbus with JZ-RS4, 1 master (R31) and 2 slaves(R10). Is there a way to check for errors in comms, Rx & TX. If comms fail, to reset all outputs on both slaves. (similar to CanBus "check alive function") thanks Matt Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted November 30, 2015 MVP 2021 Report Share Posted November 30, 2015 There is no simple Modbus "Check Alive", but you can make one with old school handshaking. Put a timer in your slave logic that sets a bit every so often. Have your master logic reset it as part of the write. Then have another timer in the slave look to see if that bit stays on for too long. Joe T. Quote Link to comment Share on other sites More sharing options...
mc controls Posted December 3, 2015 Author Report Share Posted December 3, 2015 So simple!! thanks Joe Quote Link to comment Share on other sites More sharing options...
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