Question

When does an S-mode KNX installation become ready for operation?

KNX BasicLearnSystem OverviewMedium
Answer

C — After the sensors and actuators have been downloaded with their application program via ETS.

Correct: the source states an S-mode installation is not ready until sensors and actuators are downloaded with the application program via ETS.

Source

KNX Basic Course Documentation — 3.3.1 — p. 37

All proposed choices (exam context)
  1. A.As soon as the devices are mechanically mounted and the bus voltage is present.
  2. B.Immediately, because S-mode application programs are pre-installed at the factory.
  3. C.After the sensors and actuators have been downloaded with their application program via ETS.
  4. D.Once individual addresses are assigned, even if no application program is loaded yet.
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Last updated: 19 May 2026

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