Question

Why are the maxima of 65536 group objects and 65535 group addresses described as essentially theoretical?

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Answer

C — Because they are normally not reached by current applications

Correct: The text calls them a pure theoretical value, normally not reached by current applications, comparable to the total address capacity of a KNX system.

Source

KNX Basic Course Documentation — 3.2.4 — p. 129

All proposed choices (exam context)
  1. A.Because no KNX device can physically store more than 254 objects
  2. B.Because the ETS caps every project at 254 group objects
  3. C.Because they are normally not reached by current applications
  4. D.Because the values apply only to System 1 devices
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Last updated: 19 May 2026

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