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Modbus error check with Jazz

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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")







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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.

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