05/02 AWB2725-1452GB
19
Fault-finding
The following list describes some types of fault and advice on
removing them.
Faults that affect a single channel
If the measurement is unstable, does not meet the specified accu-
racy, or indicates the value 7FFF
hex
:
X check that the wiring is correct for the channel that shows the
error
X check whether the cable from the sensor to the module runs
close to mains power supply cables
X check that the terminal connection is firmly seated
X check that the data for the Pt100/1000 that is used conform to
IEC751
X check the resistance of the external wiring
(< 400 O)
X check that the temperature to be measured lies within the range
of the XIOC-4T-PT.
Faults that affect more than one channel
All channels indicate the value 7FFF
hex
:
X check that the external supply voltage is properly connected
X check whether the load capability of the external supply is
adequate (f1 A).
