ETS Programming KNX Basic: exam questions with worked answers

Questions for the "ETS Programming" topic

1. Q01

   The 'Reset Device' command in ETS performs a software restart of a KNX device without erasing its individual address or its application configuration.

   TrueFalse

   7. ETS Programming· Geräte-Reset· Medium

   ▸

   Correct answer

   True

   Learning tip

   Reset Device = warm restart: the device loses its runtime state (RAM), reinitialises its timers, Cyclic Send and counters, but preserves its individual address, application program, ETS parameters, and Group Address to Group Object bindings. It is useful to force the re-emission of initial values (cyclic send after a crash), to test a specific power-up behaviour, or to unstick a device frozen in an inconsistent state without having to reload the configuration. Not to be confused with Unload All (full decommissioning) or with simply switching off mains power.

   Source: ETS6 User Manual — Device commands

   View the full question page →
2. Q02

   A single Group Object can be associated simultaneously with several Group Addresses in ETS, which is typically used so that an actuator reacts to several commands (e.g. individual command + zone command + scene).

   TrueFalse

   7. ETS Programming· Multi-Binding· Medium

   ▸

   Correct answer

   True

   Learning tip

   Multi-binding is a fundamental KNX pattern. Concrete examples: a lighting circuit that reacts to its local switch, to an 'all off' corridor command and to a 'leave for work' scene; a roller shutter that reacts to its local button, to a zone master and to a safety scenario (automatic close on storm warning). The actuator has a single Switch Control Group Object bound to 3-4 different Group Addresses (Lighting_Local_LivingRoom, Lighting_All_Off, Scene_Departure). All these addresses can write into the Group Object; only one (the sending address) is used when emitting status.

   Source: Porto KNX — KNX Basic Course, Multi-binding

   View the full question page →
3. Q03

   The programming button on a KNX product or the BCU has to be pressed to allocate the Group Addresses during the commissioning stage.

   TrueFalse

   7. ETS Programming· Offizielle Musterprüfung 4· Medium

   ▸

   Correct answer

   False

   Learning tip

   False. The programming button puts the device into 'programming mode' so that ETS can write its Individual Address (Physical Address), not its Group Addresses. Once the Individual Address has been downloaded, the application program and the Group Address links are downloaded over the bus using that Individual Address as the destination, with no further button press required. Confusing the two downloads is one of the most common Basic-exam pitfalls.

   View the full question page →