Siemens Simatic S7-400 - Manual (Page 134)

Digital Modules
4-12
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Table 4-9 Diagnostic Messages of the Digital Modules, Causes of Errors and Remedial
Measures, continued
Diagnostic Message Remedy Possible Error Cause
Wire break Lines interrupted Close circuit
No external sensor supply Wire sensors with 10 to 18 k W
Channel not connected (open) Disable the “Diagnostics – Wire Break”
parameter for the channel in STEP 7
Connect channel
Fuse blown One or more fuses on the module
has blown and caused this fault. Remove the overload and replace the
fuse
No sensor supply Overload of sensor supply Eliminate overload
Short circuit of sensor supply to M Eliminate short circuit
No
l
d lt L
Power supply L+ to module missing Feed in supply voltage L+
load voltage L+
Fuse in module is defective Replace module