SCALANCE XR-300WG 
Operating Instructions, 05/2017, C79000-G8976-C454-01 
3 
1  Introduction ............................................................................................................................................. 5 
2  Safety notices ....................................................................................................................................... 11 
2.1  Security recommendations ..................................................................................................... 12 
3  Description of the device ....................................................................................................................... 17 
3.1  Product overview .................................................................................................................... 17 
3.1.1  Accessories ............................................................................................................................. 19 
3.2  Device views ........................................................................................................................... 20 
3.2.1  Device view of a 24 VDC variant ............................................................................................ 20 
3.2.2  Device view of 240 VAC variant ............................................................................................. 21 
3.3  LED display ............................................................................................................................. 21 
3.3.1  Fault LED "F" .......................................................................................................................... 21 
3.3.2  "RM" LED ................................................................................................................................ 22 
3.3.3  LED "L".................................................................................................................................... 22 
3.3.4  Port LEDs "P" .......................................................................................................................... 22 
3.4  RESET button ......................................................................................................................... 23 
3.5  Combo ports ........................................................................................................................... 25 
4  Installation ............................................................................................................................................ 27 
4.1  Safety notices for installation .................................................................................................. 27 
4.2  19" rack mounting ................................................................................................................... 31 
4.3  Inserting and removing pluggable transceivers ...................................................................... 33 
4.3.1  General notes for SFP transceivers ........................................................................................ 33 
4.3.2  Using a pluggable transceiver (SFP) ...................................................................................... 33 
4.3.3  Removing a pluggable transceiver (SFP) ............................................................................... 34 
5  Connecting up ....................................................................................................................................... 35 
5.1  Safety when connecting up ..................................................................................................... 35 
5.2  Industrial Ethernet ................................................................................................................... 37 
5.2.1  Electrical ................................................................................................................................. 37 
5.2.2  Optical ..................................................................................................................................... 39 
5.3  Wiring rules ............................................................................................................................. 40 
5.4  24 VDC power supply ............................................................................................................. 41 
5.5  Power supply 240 VAC ........................................................................................................... 43 
5.6  Serial interface ........................................................................................................................ 44 
5.7  Functional ground ................................................................................................................... 45