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How to replace 140NOE by 140NOC in system

Some user replace Quantum NOE by NOC, which is always used for communicating with SCADA or 3rd party's device as ModbusTCP server.
The communication may be failure after the replacement, why can't the connection established?
The most possibilites of this issue is the UnitID in the client setting as 255, UnitID255 for NOE is normal UnitID, but for NOC, it is used for Diagnostic in NOC moudle itself.
There is a notes in NOC's user manual. Please refer to the attachment.
The solution is changing the UnitID from 255 to 0~254.
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