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1 indicators and controls, Fault leds a fault led lights up, If the power supply fails in an expansion unit – Siemens S5-135U/155U User Manual

Page 304: If there is no terminator at the last im 314, Interface modules

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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