Profibus DP Mk2 Option Card Installation Manual
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Publication PUB088-005-00_1017
Moving Inhibited
This bit will be true (1) when the Motion Inhibit Timer is active or the
Interrupter Timer is active (IQ/IQT only), or both are active.
The Motion Inhibit Timer is used in position control to prevent the
actuator from exceeding its prescribed number of starts per hour, or to
reduce the effects of hunting during closed loop control.
The Interrupter Timer in the IQ/IQT can be used over part or the entire
actuator stroke to slow down the effective speed of valve travel.
When under network control, the control signal does not need to be
re-applied when this bit is true, as the control action will continue once
the time has elapsed.
Position Control Enabled
This bit will be true (1) when a Position command is being actioned.
This data can be used to indicate that positioning mode has control of
the actuator.
Watchdog Recovery
The PFU watchdog automatically resets the processor if it is tripped.
This bit will be true (1) following a watchdog trip for the time period set
in the associated watchdog timeout parameter.
Battery Low
Applicable to IQ and IQT actuators only. The status of the internal
battery is monitored and should it fall below a critical level this signal
will become true (1). The battery is used to power the circuits used to
keep track of the valve position when the actuator mains power is
switched off. This battery is used only when the actuator has no power
feed and the valve is actually moved.
Open Interlock
Applicable to IQ and IQT actuators only. The input contact to the
Open Interlock is monitored by the PFU. Whenever the input contact
is closed this bit will be true (1). If the actuator is not using the
interlock function then this input can be used as a digital status
feedback for a plant signal not associated with the actuator. If the
interlock circuit is being used then permission must be granted before
the actuator can be opened and the presence of this bit will indicate
that opening is permitted and permission is granted.
Close Interlock
Applicable to IQ and IQT actuators only. The input contact to the
Close Interlock is monitored by the PFU. Whenever the input contact
is closed this bit will be true (1). If the actuator is not using the
interlock function then this input can be used as a digital status
feedback for a plant signal not associated with the actuator. If the
interlock circuit is being used then permission must be granted before
the actuator can be closed and the presence of this bit will indicate
that closing is permitted and permission is granted.
