Modbus MFU Option Card Installation Manual
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Publication PUB091-003-00_0119
10 MAINTENANCE AND REPAIR
There is no periodic service requirement for the MFU.
Repairs should not be attempted on the module. The Network Interface Card and Interface Card are a
pair and should never be separated. Replacing the complete MFU assembly with a new replacement
device should rectify any failure. Static sensitive devices are used in the MFU, it is therefore
mandatory to observe anti-static precautions when handling or working on the unit.
10.1 Records
In order that a replacement can be easily introduced in the event of a device failure it is very important
to record and keep safe all the settings made for the variable registers. The table lists all the registers
that must be checked and set up for each Modbus Module on a network. The data should be recorded
for each module.
Actuator Configurable Registers
Parameter
No.
Description
Setting
Notes
7
Action on Loss of Communications
8
Limited Range Position Minimum
9
Limited Range Position Maximum
10
Deadband
11
Motion Inhibit Time
12
Aux Input Mask
13
Communications Lost Position
14
Hysteresis
15
Slow Mode Range
16
Valve Jammed Time
17
Manual Movement Travel
18
Watchdog Timeout
19
ESD DI-4 / Net Disable
20
Analogue Input Max
21
Communications Fault Timer
Network Configurable Registers
Parameter
No.
Description
Setting
Notes
22
Address
23
Baud Rate (baud)
24
Parity and Stop bits
25
Data Base Format
26-31
Actuator Tag Name
Note:
Make a note of all changes to register settings to ensure that, in the case of a failure,
the replacement device can be swiftly set to the correct values.
