Diagnostic message Possible cause of error Remedy
Wire break Lines interrupted Connect the cable
No external sensor supply Wire sensors with10 to 18 kΩ.
Channel not connected (open) Disable the "Diagnostics – Wire break"
parameter for the channel in STEP 7.
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.
Sensor supply missing Overload at sensor supply Eliminate overload
Short-circuit of sensor supply to M Eliminate the short-circuit.
Load voltage L+ miss‐
ing
Power supply L+ to module missing Feed in supply voltage L+.
Fuse in module is defective Replace the module
Digital modules
4.4 Diagnostics for digital modules
S7-400 Automation System Module Data
92 Reference Manual, Ausgabe 11/2016, A5E00850736-08
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