
Analog modules
5.17 Diagnostics functions of analog modules
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
245
Diagnostic message Possible cause of error Remedy
The reference junction connected at
channel 0 is faulty due to a wire break, for
example.
Check the connections
Reference channel error
The reference temperature value
transferred is not within the value range.
Reassign the parameters for the reference
temperature
Input value below undershoot range;
possible cause of error: wrong measuring
range selected
Set another measuring range Underflow
With the measuring ranges 4 to 20 mA
and 1 to 5 V, if necessary by polarity
reversal of sensor connection
Check the connections
Overflow Input value exceeds overshoot range Set another measuring range
Run time calibration error A wiring fault has occurred on a channel
during the calibration cycle
Eliminate the wiring fault (fault remains until the
next calibration; in other words, a maximum 6
minutes or until there is a STOP-RUN transition
of the CPU).
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