Modbus Terms And Abbreviations - ABB FSCA-01 User Manual

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Modbus terms and abbreviations

Term
Exception code
Function code
Holding register
Explanation
If an error related to the requested Modbus
function occurs, the data field contains an
exception code that the server application can
use to determine the next action to be taken.
The second byte sent by the client. The function
indicates to the server what kind of action to
perform.
Holds data that will be later executed by an
application program.
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