Question
In a distributed power supply, how is the bus powered?
Answer
C — By several devices on the line, each containing a Decentralized Power Supply Unit (DPSU) with an integrated choke module
Correct: The source describes the bus being powered by devices each containing a DPSU with an integrated choke module.
Source
KNX Basic Course Documentation — 7 — p. 107
All proposed choices (exam context)
- A.By connecting the 230 V mains directly to the bus
- B.By batteries fitted inside every bus device
- C.By several devices on the line, each containing a Decentralized Power Supply Unit (DPSU) with an integrated choke module✓
- D.By a single large centralized PSU only
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