Siemens SCALANCE X-400 Operating Instructions Manual page 125

The following table lists the significance of the three LEDs on the power module for display
modes A through C:
Label
F
L1
L2
Display in display mode D
In display mode D, both the D1 and D2 LEDs of the CPU module are on. This mode
indicates whether the power supply is being monitored with the signaling contact.
Figure 6-7
The following table shows the meaning of the three light emitting diodes on the power
module in display mode D:
Label
F
L1
L2
SCALANCE X-400
Operating Instructions, 06/2015, C79000-G8976-C186-12
Color Status
off
Red on
off
Green on
off
Green on
LED display of the power module and the CPU module in DMode D
Color Status Meaning
off No problem has been detected by the IE Switch X-400.
Red on The IE Switch X-400 detects a fault. The signaling contact
opens.
off Power supply L1 is not monitored. If L1 falls below 17 V, the
signaling contact does not respond.
Green on Power supply L1 is monitored. If L1 falls below 17 V, the signal-
ing contact responds.
off Power supply L2 is not monitored. If L2 falls below 17 V, the
signaling contact does not respond.
Green on Power supply L2 is monitored. If L2 falls below 17 V, the signal-
ing contact responds.
Configuration / project engineering
Meaning
The IE Switch X-400 has not detected any faults, the sig-
naling contact is closed.
The IE Switch X-400 has detected a fault, the signaling
contact opens.
Power supply L1 lower than 17 V.
Power supply L1 higher than 17 V.
Power supply L2 lower than 17 V.
Power supply L2 higher than 17 V.
6.5 LED display
125