Modbus MFU Option Card Installation Manual
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Publication PUB091-003-00_0119
5.2.2
Digital Inputs from IQ and IQT Actuator
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 MFU. 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 this bit will indicate the existence of
an interlocking input that can prevent the actuator from opening.
Close Interlock
Applicable to IQ and IQT actuators only. The input contact to the
Close Interlock is monitored by the MFU. 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 this bit will indicate the existence of
an interlocking input that can prevent the actuator from closing.
Digital Input DI-1
Applicable to IQ and IQT actuators only. This bit reports the status of
the contact connected to the actuator hard wired
Open
terminals. The
input can be used to control the actuator or simply to report the status
of a plant feedback signal. The function is set in the Auxiliary Input
Mask parameter which determines whether the bit is reported as true
(1) for a closed contact or an open contact and whether the input
controls the actuator or not. Note that the input is always reported
even when it is also controlling the actuator.
Digital Input DI-2
Applicable to IQ and IQT actuators only. This bit reports the status of
the contact connected to the actuator hard wired
Close
terminals. The
input can be used to control the actuator or simply to report the status
of a plant feedback signal. The function is set in the Auxiliary Input
Mask parameter which determines whether the bit is reported as true
(1) for a closed contact or an open contact and whether the input
controls the actuator or not. Note that the input is always reported
even when it is also controlling the actuator.
Digital Input DI-3
Applicable to IQ and IQT actuators only. This bit reports the status of
the contact connected to the actuator hard wired
Stop/Maintain
terminals. The input can be used to control the actuator or simply to
report the status of a plant feedback signal. The function is set in the
Auxiliary Input Mask parameter which determines whether the bit is
reported as true (1) for a closed contact or an open contact and
whether the input controls the actuator or not. Note that the input is
always reported even when it is also controlling the actuator.
