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What Modbus TCP unit ID can be used to communicate to BMENOC030x cards? 

Published date: 30 August 2019

Issue
In the past, using an index of 255 has been a problem on some products communicating Modbus TCP.

Product line
Modicon X80, Modicon M580

Resolution
Function code 3 with a Unit ID of 255 will return diagnostic information for the Quantum and M340 NOC products.  Function code 3 with a Unit ID of 100 will return diagnostic information for the M580 NOC products.  Those are the only Unit ID's that will return something other than register information when used in conjunction with the Function code 3. We are not aware of any other restrictions.

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