Description of the device   
3.4 C-PLUG / KEY-PLUG 
  SCALANCE XR-500 
32  Operating Instructions, 05/2017, A5E03275845-11 
Meaning in display mode C 
In display mode C, the port LEDs indicate the mode. 
 
Port operating in half duplex mode 
Green  On  Port operating in full duplex mode 
Meaning in display mode D 
In display mode D, the port LEDs indicate whether the port is monitored. 
 
Green  On  Port is monitored for "Link down". 
If no link was established at the port (e.g. cable not 
plugged in), the signaling contact indicates an error. 
Yellow  On  Port is monitored for "Link up". 
If a link was established at the port, the signaling contact 
Meaning in display mode E 
In display mode E, the port LEDs indicate whether the connected device is supplied using 
PoE. 
 
The connected device is not supplied using PoE. 
The connected device is supplied via PoE. 
 
 
Function of the C-PLUG/KEY-PLUG 
 
Do not remove or insert a C-PLUG/KEY-PLUG during operation 
A C-PLUG/KEY-PLUG may only be removed or inserted when the device is turned off.