Siemens SCALANCE XB108-2 Operating Instructions Manual page 16

Description of the device
3.4 LED display
SC/ST ports
There is an LED for each SC/ST port.
LED color
Green
Orange
-
Power LEDs "L1" and "L2" (green LEDs)
The power LEDs show the status of the power supply at connectors L1 and L2.
LED color
Green
-
16
LED status Meaning
Lit link exists
Lit Receiving data at port
Off No link exists
LED status Meaning
Lit Power supply L1 or L2 is connected.
Off Power supply L1 and L2 are not connected or L1 and L2
<9.6 V.
Operating Instructions, 02/2019, C79000-G8976-C473-03
SCALANCE XB-100