Indicators And Controls - Siemens S5-155U System Manual

The 304 and 314 Interface Modules
7.3.1

Indicators and Controls

7 - 16
Fault LEDs
A FAULT LED lights up
• • if the power supply fails in an expansion unit;
• • if there is no terminator at the last IM 314;
• • in the event of a cable open-circuit or wrong setting of DIL switch
S3 for the IM 304,
• • or if an EU which is ready and operational is connected to an
interface which is switched off.
34
1
18
Interface ( X3 )
33
50 17
Fault Signal:
Interface ( X3 ) Faulty
Fault
Fault
Fault Signal:
Interface ( X4 ) Faulty
34 1
18
Interface ( X4 )
33
17
50
IM 304
Figure 7-11 Front Plates of the IM 304 and IM 314
34
1
18
33
50 17
34
1
18
33
50 17
IM 314
System Manual
C79000-B8576-C199-03