Modbus MFU Option Card Installation Manual
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Publication PUB091-003-00_0119
scaled. This scaling is retained in EEPROM when the actuator power
is removed.
If Limited Range Positioning is invoked by setting the appropriate
parameters, then the reported valve position 0 to 100% follows the
limited range of valve travel.
Analogue Input
The current value of the analogue input is reported as an Integer
Value in the range 0 to 1000 (0 – 3E8 hex) representing the
percentage value to 0.1% resolution.
The input may be 0 to 5V or 0 to 20mA d.c. from an externally
powered field transmitter (the actuator does not provide the power for
the transmitter).
The input must be calibrated during the set-up of the MFU using the
Analogue Input Max parameter. Apply a 100% signal and write a
value to the parameter, the current value will then be reported as
100%. The scaling is retained in EEPROM when the actuator power is
removed.
5.4 IQ Data Logger Information
The Modbus Module also makes available some of the IQ and IQT data logged information from
registers in the data base. The data available is updated when the actuator reaches the end of travel
and stops moving, provided the actuator selector is in the ‘Remote’ position.
Close Torque Set
One register records the actuator setting for the maximum
generated torque value permitted when the actuator is moving
towards the closed position.
Open Torque Set
The actuator setting for the maximum generated torque value
permitted when the actuator is moving towards the open position is
recorded in this register.
Torque at x% when opening
There is a set of registers that each record the last value
for the torque generated when the actuator is moving from closed to
open and reaches a particular position (x%). The registers contain 11
values of torque generated in 10% position increments between 0%
and 100% of valve travel.
Torque at x% when closing
There is a set of registers that each record the last value
for the torque generated when the actuator is moving from open to
closed and reaches a particular position (x%). The registers contain
11 values of torque generated in 10% position increments between
100% and 0% of valve travel.
Motor Starts – Closing Direction
Two registers (one double register) contain the
total number of times the motor contactor to close the valve has been
operated. The first register contains the low order 16 bits. The counter
cannot be reset to zero.
Motor Starts – Opening Direction
Two registers (one double register) contain the
total number of times the motor contactor to open the valve has been
