
Digital modules
4.4 Diagnostics for digital modules
S7-400 Automation System Module Data
102 Reference Manual, Edition 09/2009, A5E00850736-06
Diagnostic message Possible cause of error Remedy
Lines interrupted Connect the cable
No external sensor supply Wire sensors with10 to 18 kΩ.
Disable the "Diagnostics – Wire break"
parameter for the channel in STEP 7.
Wire break
Channel not connected (open)
Wire the channel
Fuse blown One or more fuses on the module
has blown and caused this fault.
Remove the overload and replace the
fuse.
Overload at sensor supply Eliminate overload Sensor supply
missing
Short-circuit of sensor supply to M Eliminate the short-circuit.
Power supply L+ to module
missing
Feed in supply voltage L+. Load voltage L+
missing
Fuse in module is defective Replace the module
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