Siemens S5-135U/155U - Manual (Page 294)

7-4
System Manual
C79000-G8576-C199-06
7.1.1 Indicators and Controls
IM 300-3:
I/O Module Failure LED
This LED lights up if the supply of power to the connected EUs has failed
and/or the connecting cable is open-circuit.
IM 300-5 (-5CA11):
I/O Module Failure LEDs
LEDs LD1 and/or LD2 light up if a module inserted in the EU no longer
responds to an access by the CPU.
The IM 312 has no indicators or controls.
50
34
18
33 17
1
IM312
Fault
50
34
18
33 17
1
50
33
17
34
18
1
IM300-5
Fault
I/O Module
Fault
50
34
18
33 17
1
IM300-3
Failure
I/O Module
Failure
Figure 7-1 Front Plates of the IM 300 and IM 312
Interface Modules