Input and Output Signals
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In addition, an optional extra relay board can be fitted with four more relays. The status of these relays
is then adjusted by Modbus commands on outputs DO-1 to DO-4. Note that these relays are latching
and, if energised, will not change state when the actuator power is removed. On restoration of power
the relays will be reset to their de-
energised condition and the coils will report ‘0’.
5.1.6
IQ3 Modbus Network Control Disable feature
It is possible to set the IQ3 ESD/DI-4 input so that the actuator ignores open, stop, close, ESD, partial
stroke test and position control signals sent over the Modbus network. If the ESD DI-4 / Net Disable
parameter is set to Active, then when the ESD input connection is made (i.e. 24 volts applied to ESD),
Modbus control is not allowed. This feature is independent of the Auxiliary Input Mask setting. When
the ESD DI-4 / Net Disable parameter is set to active, no ESD will be available.
5.2 Actuator Digital Input Status Feedback
The Modbus Module can report over the network a comprehensive data set relating to the status of
the valve and actuator, as indicated in the table below. The conventional contact indications are also
available from the actuator limit switches and indication contacts.
Status Feedback
IQ3
SI
₃
CVA
CMA
K-Range
Actuator Moving
✓
✓
✓
✓
✓
Close Limit
✓
✓
✓
✓
✓
Open Limit
✓
✓
✓
✓
✓
Running Closed
✓
✓
✓
✓
✓
Running Open
✓
✓
✓
✓
✓
Remote selected
✓
✓
RUN
✓
✓
Local Stop selected
✓
✓
STOP
✓
✓
Local selected
✓
✓
①
✓
✓
Thermostat Tripped
✓
✓
④
✓
✓
Monitor Relay
✓
✓
✓
✓
✓
Valve Obstructed
✓
✓
✓
✓
✓
Valve Jammed
✓
✓
✓
✓
✓
Valve Moving by Hand
✓
✓
✓
✓
Moving Inhibited
✓
✓
✓
Position Control Enabled
✓
✓
✓
✓
Watchdog Recovery
✓
✓
Battery Low
✓
②
Open Interlock input
✓
✓
Close Interlock input
✓
✓
DI
–1
✓
✓
✓
DI
–2
✓
✓
③
✓
DI
–3
✓
✓
✓
DI
–4
✓
✓
✓
