Page 192 - Advanced Course

KNX ADVANCED COURSE

7.2 Task 2: Lighting – Closed Loop Control Master-Slave with
separate Actuator

Illumination level at a workplace shall be kept constant at 500 lux. Additionally it should be
possible to change the parametrised luxvalue setpoint (300 – 800 lux), and the light shall
be also manually operable (i.e., automatic / manual changeover shall be possible).
As a device for this task the brightnesscontroller type Siemens UP255 shall be used.
During the commissioning procedure it has to be calibrated, to adopt it to the prevailing
light- and reflexion conditions.
Process description see further below!

A device to control shall be a 4-gang push button which also can set 16 bit values, or a
suitable binary input or a push button interface.

Functions of this 4-gang push button:

Rocker A: lighting manually on/off + dimming
Rocker B: Automatic on/off
Rocker C: Presence on/off
Rocker D: Upper button setpoint 600 lx; lower button setpoint 400 lx

Alternatively (and much better) a display and operation unit would be recommendable,
where beside the normal operating functions you can also see the current brightness level
indication, and which permits a nearly continuous adjustment of the setpoint.

Example: Siemens 5WG1585-2AB11 (UP 585) Display- and operation unit.

Project design

Create the following group addresses

• Licht E on/off
• Light F on/off
• Light E dimming
• Light F dimming
• Sensor setpoint adjust
• Calibration trigger
• Automatic control on/off
• Presence on/off
• Dimmvalue set auto Licht E
• Dimmvalue set auto Licht f

Parametrise and link the bus devices
Check the necessary read flags in the sensor UP255 and the S/D actuator
Use default settings of the device if not otherwise defined

Home and Building Management Systems KNX Association
Lighting Control Lighting Control_E0310a.doc 33/34