Siemens SCALANCE XM-400 Configuration Manual page 237

Figure 5-8
If a PE408PoE is inserted in slot 2, its two PSE slots have indexes 1 and 2. If a PE408PoE is
inserted in slot 3, its two PSE slots have indexes 3 and 4.
The numbering of the PSE units is decided by the slots. If there is a port extender without PoE
in slot 2, and there is a PE408PoE in slot 3, the PSE units in slot 3 still have the indexes 3 and
4.
Figure 5-9
With a SCALANCE XM416-4C with which you can only connect one port extender, the indexes
of the PSE units are 1 and 2.
Power over Ethernet with SCALANCE XR528-6M and SCALANCE XR552-12M
With SCALANCE XR528-6M and SCALANCE XR552-12M only the module slots 1 to 3 can
be fitted with PoE modules.
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12
SCALANCE XM-400 with 2 PE408PoE port extenders
SCALANCE XM-400 with 2 port extenders (1 port extender without PoE and 1 PE408PoE)
Configuring with Web Based Management
5.4 The "System" menu
237