Description of the device
3.3 LED display
SCALANCE XR-500
Operating Instructions, 05/2014, A5E03275845-05
21
Meaning in display mode D
In display mode D, the "L1" and "L2" LEDs indicate whether the power supply is monitored.
Table 3- 3
Monitoring for devices with 24 VDC
L1/L2 LED
L1/L2 connector
LED color
LED status
-
Off
Power supply is not monitored.
If the power supply falls below 17 VDC, the signaling contact does
not respond.
Green
On
Power supply is monitored.
If the power supply falls below 17 VDC, the signaling contact
responds.
Table 3- 4
Monitoring for devices with 100 to 240 VAC
L1/L2 LED
L1/L2 connector
LED color
LED status
-
Off
Power supply is not monitored.
If the power supply falls below 90 VAC, the signaling contact does
not respond.
Green
On
Power supply is monitored.
If the power supply falls below 90 VAC, the signaling contact
responds.