ABB C100 - 5 MODBUS FUNCTIONS; 5.3 Force Single Coil - Function Code 05; 5.3.1 Force Single Coil Query; 5.3.2 Force Single Coil Response

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5 MODBUS FUNCTIONS…
5.3 Force Single Coil – Function Code 05
5.3.1 Force Single Coil Query
This message forces a single coil either ON or OFF. The data value 65,280 (FF00
HEX) sets the coil ON and the value zero turns it OFF. All other values are illegal
and have no effect on coil status.
Note. To write to a coil its offset address (one less than the coil number) must
be used, e.g. to write to coil 30, the coil address 29 (1CH) is transmitted.
The use of slave address zero (broadcast mode) forces all attached slaves to
modify the desired coil.
Example. Switch ON coil address 30 (auto/manual state) in slave 01.
Coil Coil Data Data Error
Address Function Offset Offset Value Value Check (CRC-16)
High Low High Low Field
01 05 00 1D FF 00 80 FF
5.3.2 Force Single Coil Response
The response is confirmation of the query after the coil state has been altered.
Example
Coil Coil Data Data Error
Address Function Offset Offset Value Value Check (CRC-16)
High Low High Low Field
01 05 00 1D FF 00 28 60