Modbus MFU Option Card Installation Manual
26 of 64
Publication PUB091-004-00_0918
The control commands have three potential sources:
Modbus RS-485 network generated commands
Actuator Local Controls
Direct contact input controls
The full list of commands is shown in the next table.
Command
IQ3
SI
₃
CVA
CMA
K-Range
Modbus over the network
Open
✓
✓
✓
✓
✓
Close
✓
✓
✓
✓
✓
Stop
✓
✓
✓
✓
✓
Emergency Shut Down
✓
✓
✓
✓
✓
Relay output DO-1
✓
✓
Relay output DO-2
✓
✓
Relay output DO-3
✓
✓
Relay output DO-4
✓
✓
Analogue Position Demand
✓
✓
✓
✓
✓
Partial Stroke Test
✓
✓
Local Controls
Open
✓
✓
✓
Close
✓
✓
✓
Stop
✓
✓
✓
✓
Direct Hard Wired Inputs
Open
✓
✓
✓
Close
✓
✓
✓
Stop/Maintain
✓
✓
✓
Emergency Shut Down
✓
✓
✓
Open Interlock (active prevents opening)
✓
✓
Close Interlock (active prevents closing)
✓
✓
Note:
– Requires Digital Input / Output card or Extra Relay card to be fitted
– Requires a DSM or MSM with the optional potentiometer.
The Modbus network commands for Open, Close and Stop will operate the actuator provided:-
•
Local/Local Stop/Remote selector is in ‘Remote’,
•
Modbus commands are not inhibited by the ‘Inhibit/DI-4’ input parameter setting and DI-4
condition,
•
No interlock is active,
•
There is no standing hard wired control input active, except for Stop/Maintain,
•
No alarm condition prevents it from moving,
