Siemens S7-400 Manuale Utente

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

Wire break

Lines interrupted

Close circuit

No external sensor supply

Wire sensors with 10 to 18 k

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