The type of bus power supply is set on the "Basic settings" operating page on the "Dec bus power supp" line.
Main menu > Commissioning > Communication > Basic settings
Distributed bus power supply, RM… controllers
Default value: On.
Setting values: Off/On
Note
In small networks, the KNX bus can be operated with default value "Dec bus power supp: On". See Section 2.2 for information about the bus power supply.