Analog Modules
4-74
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Table 4-48 Diagnostics Messages of the Analog Input Modules, Causes of Errors and
Remedial Measures
Diagnostics
Message
RemedyPossible Error Cause
Underflow Input value underflows underrange,
error may be caused:
Wrong measuring range selected
Configure other measuring range
With the measuring ranges 4 to
20 mA and 1 to 5 V, if necessary by
polarity reversal of sensor
connection
Check terminals
Overflow Input value overflows overrange Configure other measuring range
Causes of errors and remedial measures for analog output modules
Table 4-49 Diagnostics Messages of the Analog Output Modules, Causes of Errors and
Remedial Measures
Diagnostics
Message
Possible Error Cause Remedy
External load voltage
missing
Load voltage L+ of module
missing
Feed supply L+
Configuring/parameter
assignment error
Illegal parameters transferred to
module
Reassign module parameter
Short-circuit after M Overload of output Eliminate overload
Short-circuit of output Q
V
after
M
ANA
Eliminate short circuit
Wire-break Actuator resistance too high Use different type of actuator or connection,
e.g. use conductors with a larger
cross-sectional core area
Open circuit between module
and actuator
Close circuit
Channel not used (open) Disable channel group (”output type”
parameter)
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