ABB i-bus KNXPlanning and applicationDLR/A 4.8.1.1 | 2CDC507128D0202 1894.11.1 Slave with offset functionThe DALI Light Controller features, in addition to the additional function Slave, an offset with the slave thatcan be used to control a lower or higher level of brightness than the brightness level of the master. In thefollowing, both these functions should be described in more detail using a room with two lighting strips asan example.Using the additional function Slave, a second lighting strip (slave) can be controlled in the room. Up tonow, both lighting strips were normally controlled with the same brightness value.With the DALI Light Controller, the transfer of the master/slave brightness value can be via acommunication object (Brightness value of slave of group x) or directly internally in the DALI LightController. The bus loading is minimized by internal communication. This parameterization is undertaken inthe Parameter window - Gx Slave, page 108.Daylight lights the area of the room near the window more than the rear area of the room. To light the reararea of the room adequately, Strip 1 must produce a brightness value x. Owing to the daylight, Strip 2could be controlled with a lower brightness value (x - x %) without the room being too dark.In the DALI Light Controller, an offset is available for this behavior for every light controller lighting group.This parameterization is undertaken in the Parameter window - Gx Light controller, page 95. Theparameter for the offset is visible if the parameter Light controller controls as "master" other dimmeractuators is set to yes. A percentage value x can be parameterized as an offset. The slave is controlledwith a brightness value X % brighter or darker than the master.
