Siemens S5-135U/155U - Manual (Page 304)

7-14
System Manual
C79000-G8576-C199-06
7.3.1 Indicators and Controls
Fault LEDs
A FAULT LED lights up
S
if the power supply fails in an expansion unit;
S
if there is no terminator at the last IM 314;
S
in the event of a cable open-circuit or wrong setting of DIL switch S3 for
the IM 304;
S
or if an EU which is ready and operational is connected to an interface
which is switched off.
Interface (X3)
Interface(X4)
Interface (X4) Faulty
Fault Signal:
Interface (X3) Faulty
Fault Signal:
Fault
Fault
50
34
18
33 17
1
50
33
17
34
18
1
50
34
18
33 17
1
50
33
17
34
18
1
IM 304 IM 314
Figure 7-11 Front Plates of the IM 304 and IM 314
Interface Modules