rotork Modbus - Data Accessed with Function Code 05 and 15 - Force Single and Multiple Coils; Data Accessed with Function Code 06 and 16 - Preset Single and Multiple Registers; Data Accessed with Function Code 07 - Read Exception Status

Input and Output Signals
Publication PUB091-004-00_0918 49 of 64
7.6.5 Data Accessed with Function Code 05 and 15 – Force Single and Multiple Coils
Location
(Bit)
R/W
Data
Range
0
R/W
Stop command output coil status
0-FF00 hex
1
R/W
Close command output coil status
0-FF00 hex
2
R/W
Open command output coil status
0-FF00 hex
3
R/W
ESD command output coil status
0-FF00 hex
4
R/W
DO-1 output coil status (extra relay S5)
0-FF00 hex
5
R/W
DO-2 output coil status (extra relay S6)
0-FF00 hex
6
R/W
DO-3 output coil status (extra relay S7)
0-FF00 hex
7
R/W
DO-4 output coil status (extra relay S8)
0-FF00 hex
8
R/W
Partial stroke test
0-FF00 hex
Using code 05 write FF00 (hex) to turn on the command, DO-1 to DO-4 are turned off by writing ‘0’.
The other coil commands are cleared by various means as explained in section 5.1.2.
Using code 15 write 1 to turn on the command and 0 to turn off the command.
The commands to open, close, stop, ESD or partial stroke test the actuator are not cancelled by
writing a ‘0’, but this will de-energise the coils. The actuator latches the instruction and will complete
the action unless a subsequent counter command is received before the action is completed.
7.6.6 Data Accessed with Function Code 06 and 16 – Preset Single and Multiple Registers
Location
(Reg/Bit)
R/W
Data
Range
5
-
R/W
Actuator Digital Control
0-4
0 = stop
1 = close
2 = open
3 = ESD
4 = partial
stroke test ①
6
-
R/W
Actuator Position DV (desired value)
0-3E8 hex
(0.0 – 100.0%)
Note ① Integer value, not bit location.
The Actuator Digital Control register allows one of the five commands to be selected by writing the
appropriate value.
Provided limited range positioning is not invoked, the Actuator Position DV register assigns a special
importance to the values 0% and 100% written to this register. The command is revised so as to fully
close the valve to its tight shut off position (0%) and to fully open the valve (100%).
7.6.7 Data Accessed with Function Code 07 – Read Exception Status
Code 07 reads a predefined data set with minimal overheads and is used for fast data transfer. A
single byte is returned.