Art. No. SC 1000 KNX
4.2.4.1.5 Channel function "Dimming (Brightness value)"
1-byte brightness value telegrams (absolute dimming via 1-byte values in compliance with KNX
DPT 5.001 scaling) can be transmitted to the bus by using the channel function "dimming
(brightness value)". In this way, it is possible to actuate lighting systems in combination with
dimmer actuators. Similarly, KNX speed controllers can be addressed whereby motors can be
switched on and off and the speed changed.
The difference between the channel functions "dimming (Start/Stop)" and "dimming (brightness
value)" is in the data formats of the communication objects.
A KNX channel "dimming (brightness value)" has a display element and sensor surface in the
graphic interface for operation. The display area and sensor area, depending on the existing
operation concept, are combined into one surface (direct operation) or distributed on two
surfaces (selection operation). The sensor element is always executed as a rocker function and
distinguishes between short and long operations.
A short sensor operation triggers value telegrams "100 %" or "0 %", depending on the operated
sensor surface
+
or
-
. In this way, as with a switching operation, the activated load is switched
on and off. Brightness value telegrams are transmitted to the bus gradually in a defined time
interval by means of long operations of the sensor surfaces
+
or
-
. The device then increases or
decreases the value cyclically during the operation depending on the value transmitter level
configured in the ETS and transmits the values as a brightness setting. The value sequence
generated in this way is converted to a dimming process by the activated dimmer actuator. The
time between two value telegrams can be configured in the ETS and must be attuned to the
dimming speed of the dimmer actuator as much as possible in order to attain a constant and
interruption-free dimming process.
The value transmitter level can be configured in the ETS to "not to be transmitted during
adjustment". In this case, the value adjustment is deactivated by a long button-press.
The time for short and long operations can be adjusted in the ETS as "Time between switching
and dimming".
Figure 31: Example of an operating and display element of the channel function "dimming
(brightness value)"
left: direct operation / right: selection operation
(A) Text name
(B) Status value
(C) Status icon
(D) Bar graph in the sensor area
(E) Slider in the sensor area
Page 86 of 347
Software "Smart Control 501511"
Functional description
