Input and Output Signals
Publication
PUB091-004-00_0918
61 of 64
8
SETTING UP AND MAINTAINING THE MFU
In most applications the majority of the default settings in the Modbus Module will be suitable for the
operation of the valve and need not be altered. However, in every case it will be necessary to alter the
address since the default should never be used within a live system (the default value is 247).
8.1 Using a Network Configuration Tool
Any device capable of writing register values can be used to configure the Modbus Module. Changes
to the actuator related parameter registers and network related parameter registers become active
immediately they are altered.
The individual register values required may be different for each actuator and will depend on the
application and process being controlled as well as the actuator size, speed and other design features.
8.2 Setting up an IQ3 with the Setting Tool
The IQ3 actuator includes an infra-red and a Bluetooth communication port for setting the actuator
performance, limit switches and so on. This communication link can be used to set some, but not all,
of the MFU parameter registers. The registers should still be checked with a Modbus host device to
ensure optimum actuator and network compatibility.
The parameters that may be set by using the Setting Tool and the infra-red or Bluetooth link are listed
below. The available range for the deadband setting when using the setting tool is less than the range
found using the configuration tools.
Parameters may only be altered if the actuator control knob is set to the Local or Local Stop position.
Register
Number.
Description
Range
Default
Value
7
Action on Loss of Comms
Nothing (No Action),
Stop, Close, Open,
Position
Nothing
8
Limited Range Position Minimum
0 - 100%
0%
9
Limited Range Position Maximum
0 - 100%
100%
10
Deadband
0.0 - 25.5%
5.0%
11
Motion Inhibit Time
0 - 255 sec
3 sec
12
Aux Input Mask
0 - 255 (00
– FF hex)
15 (0F)
13
Comms Lost Position
0.0 - 100.0%
0.0%
14
Hysteresis
0.0 - 25.5%
2.0%
22
Address
0 - 247
247
23
Baud Rate (baud)
300, 600, 1k2, 2k4,
4k8, 9k6, 19k2, 38k4
57k6 and 115k2
9k6
24
Parity (1 stop bit)
Odd, Even, None
None
25
Termination
0 = Off
– 1 = On
Off
