medium KNX Advanced exam questions

Medium level questions

1. Q01

   Tunable White control (variable colour temperature, e.g. 2700 K warm to 6500 K cool) over KNX typically uses two distinct DPTs: one for the overall intensity (DPT 5.001, %) and one for the colour temperature (DPT 7.600, K).

   TrueFalse

   5. Lighting Control· Tunable White· Medium

   ▸

   Correct answer

   True

   Learning tip

   DPT 7.600 is Absolute Colour Temperature in Kelvin (16 bits, technical range 0-65535 but usable range 2000-10000 K). Combined with DPT 5.001 for intensity, it allows independent control of the two dimensions. This is the standard binding for Tunable White luminaires using a warm-white plus cool-white dual-channel LED.

   Source: KNX Specifications V3.0.0 (public) — DPT 7.600 Absolute Color Temperature

   View the full question page →
2. Q02

   A KNX presence detector configured with a 15-minute timeout keeps the lighting on for that duration after the last detection, then automatically switches it off.

   TrueFalse

   5. Lighting Control· Präsenzerkennung· Medium

   ▸

   Correct answer

   True

   Learning tip

   Off-delay values typically range from 5 to 30 minutes depending on usage: around 15 minutes for offices, 3 minutes for corridors, 5 minutes for restrooms. The detector sends DPT 1.001 = 1 on detection and DPT 1.001 = 0 once the off-delay elapses. It is commonly combined with a lux sensor so the light is not switched on when daylight is already sufficient.

   Source: Theben PIR detector application

   View the full question page →
3. Q03

   A standard KNX end-of-works deliverable typically includes the .knxproj project file, printed documentation (topology, Group Address table, electrical schematics), functional-test reports, user training, and a separate .knxkeys keyring file when KNX Secure is used.

   TrueFalse

   13. Project best practices· Projektdokumentation· Medium

   ▸

   Correct answer

   True

   Learning tip

   A professional integrator's handover package usually contains: (1) the signed/dated/versioned .knxproj file, (2) printed topology (devices, IPs, Individual Addresses, lines/areas), (3) a Group Address list with name, DPT, bindings and description, (4) electrical schematics (bus wiring, power supply, terminations), (5) signed functional-test reports, (6) a 2-4 h end-user training session, (7) the .knxkeys keyring if Secure is used, with the password transmitted by a separate channel, and (8) a maintenance datasheet listing key contacts and SLA terms. This aligns naturally with ISO 9001 and company-level certifications.

   View the full question page →
4. Q04

   DALI devices can be commissioned through the KNX/DALI gateway, typically using ETS apps or manufacturer-specific tools.

   TrueFalse

   5. Lighting Control· Beleuchtung & Beschattung· Medium

   ▸

   Correct answer

   True

   Learning tip

   Modern KNX/DALI gateways embed a DALI master controller that performs short-address assignment, group setup and scene programming on behalf of the installer. Many manufacturers ship a dedicated ETS App that exposes this DALI commissioning inside the ETS user interface, while others rely on a separate web tool or USB application. In either case the gateway is the interface between the KNX project and the DALI bus state.

   View the full question page →
5. Q05

   RGB control via KNX is typically performed with 3-byte colour telegrams (DPT 232.600).

   TrueFalse

   5. Lighting Control· Beleuchtung & Beschattung· Medium

   ▸

   Correct answer

   True

   Learning tip

   DPT 232.600 packs the red, green and blue components into a single 3-byte structure, each component scaled from 0 to 255. A single Group Address therefore carries the complete colour setpoint, which keeps the three channels synchronised and avoids the colour drift that occurs when R, G and B are updated independently. KNX visualisations and colour pickers natively serialise their output into this DPT.

   View the full question page →
6. Q06

   Window contacts in a room can switch the HVAC system to frost protection mode through a KNX logic link.

   TrueFalse

   4. HVAC Control· HLK & Energie· Medium

   ▸

   Correct answer

   True

   Learning tip

   When a window contact reports 'open', it is standard practice to drive the room controller's HVAC mode object (DPT 20.102) to Frost/Heat protection, or to force its setpoint down to the frost protection value. The link is usually implemented either directly by parametrising the room controller or through a simple logic block that translates the 1-bit window state into the matching mode telegram. This avoids heating against an open window and protects pipes during winter ventilation.

   View the full question page →
7. Q07

   Energy management in KNX can include load shedding in order to prevent grid overload during peak demand.

   TrueFalse

   11. Smart Metering· HLK & Energie· Medium

   ▸

   Correct answer

   True

   Learning tip

   Load shedding logic monitors the measured total power (e.g. DPT 14.056) and, when a configured limit is approached, disables loads in a defined priority order (typically water heater, then auxiliary heating, then ventilation, then comfort outlets). Each load is wired to a priority/disable object and re-enabled when consumption drops below a hysteresis threshold. This avoids exceeding the contractual subscription or activating a peak tariff and is a standard energy-management feature on KNX.

   View the full question page →