5.1 Controls
The FF CP card can be used to control the actuator and position the valve. The valve may be moved
fully closed, fully open or to an intermediate position. Additionally, the actuator can make the valve
adopt an Emergency Shut Down position and in some actuators perform a partial stroke test. Most
actuator types can be prevented from moving by the presence of an Interlocking signal from another
device on the plant. The actuator may also be operated from its local controls or by hard-wired direct
contact inputs. Note that to do this the Auxiliary Mask must be correctly set.
As well as controlling the actuator the FF CP can also be used to operate 4 discrete output relays
when the actuator is fitted with a relay card, assuming the DO block itself isn’t in IMAN, LO or OOS.
The control commands have three potential sources:
Foundation Fieldbus generated commands
Actuator Local Controls
Direct Hard-wired input controls
The full list of commands is shown in the table. The actuator types show whether the command is
applicable to that actuator type.
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