Actuator Input Output Signals
Publication PUB089-005-00_0618 31 of 116
5.1.1 Controls priority
Since there can be several potential sources for control inputs the actuator and FF CP card assigns a
priority for those occasions when two or more commands are applied simultaneously.
Local controls go direct to the main board and override any Foundation controls and any hard-wired
controls except hard-wired ESD. An actuator that has Local selected cannot be controlled over the
Foundation network.
In addition, the remote control hard-wired inputs can be used as discrete input signals, to report the
status of other devices or as control inputs. The associated Auxiliary Input Mask parameter must be
set to select the required function. When selected for control, the hard-wired inputs take priority over
the Foundation controls, but are subordinate to the local controls (except for ESD). If there is a
Foundation command still present when a Local or Hard-wired command is removed, the Foundation
command will re-assert itself.
In the case of the hard-wired input for ESD, this can be configured either as an ESD/HW_DI-4 signal
or as a ‘Foundation Command Inhibit’ to prevent network control signals from moving the actuator.
Mechanically interlocked to prevent both at the same time.
The actuator can be set so that Local Stop has a higher priority than ESD.
Only one Foundation command should be applied at a time.
If a Foundation command is applied whilst Hard-Wired Stop is present, stop is cancelled.
Fig 5.3: Controls Priorities
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