Force Single Coil - Function Code 05 - ABB COMMANDER 100 Operating Manual

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.
Address Function
01 05
5.3.2 Force Single Coil Response
The response is confirmation of the query after the coil state has been altered.
Example
Address Function
01 05
Coil Coil
Offset Offset
High Low
00 1D
Coil Coil
Offset Offset
High Low
00 1D
5 MODBUS FUNCTIONS...
Data Data
Value Value
High Low
FF 00
Data Data
Value Value
High Low
FF 00
Error
Check (CRC-16)
Field
80 FF
Error
Check (CRC-16)
Field
28 60
11