Page 90 - Advanced Course

KNX ADVANCED COURSE

1.2.2 Learning or Programming Scenes
The scene must be pre-assigned parameters in ETS for the method outlined in section
1.2.1. However the user will generally want to carry out changes himself after a certain
period. The mode “Recall scenes” is therefore used in the controller modules that are
suitable for this. This means that all the scene objects are now read out via a further
object instead of group write telegrams being sent. It is necessary for the read flag to be
set for all the actuator objects of the bus devices that are contained in the scene. Before
reprogramming the respective scene, the user can recreate the required scene that is to
be stored using local operation. This state is then stored in the scene controller and can
be recreated as often as required by recalling the scene. It is not possible however to
learn time-controlled scenes with repeated telegrams.

Scene control - Method 2
Scene control - Method 2

Preselection A: Scene 1
Preselection B: Scene 2
Preselection C: Scene 3
Preselection D: Scene 4
Scene module Switch actuator
4-fold push
button Recall gr. 1 Switch
Recall scene 1/2 "1" = Scene 1 Recall scene 1/2 1 1 0 0 EIS 1 (1bit) EIS 1 (1bit)
EIS 1 (1bit) EIS 1 (1bit) Program gr. 1 Status
Recall scene 3/4 "1" = Scene 3 Recall scene 3/4 EIS 1 (1bit) EIS 1 (1bit)
EIS 1 (1bit) EIS 1 (1bit) Recall gr. 2
Prog. scene 1/2 "1" = Scene 1 Prog. scene 1/2 0 1 1 0 EIS 1 (1bit) Switch actuator
EIS 1 (1bit) EIS 1 (1bit) Program gr. 2 Switch
Prog. scene 3/4 "1" = Scene 3 Prog. scene 3/4 EIS 1 (1bit) EIS 1 (1bit)
EIS 1 (1bit) EIS 1 (1bit)
Disable prog. Set read flag !
EIS 1 (1bit) 1 2 3 4

Figure 2: Scene programming: The 4-fold push button causes the controller to read in any
modified actuator states

1.3 Logic Controller
Some bus devices support the option of implementing simple logic functions directly in the
actuator or sensor. However this is almost always limited to a 2-fold gate that only has an
AND or OR function.
In order to implement larger logic gates or even create cascaded gates and internal
feedback loops (which are often required in alarm system applications), separate modules
are used which have the sole function of generating the output signal from several input
conditions on the bus (received via bus telegrams). They do not have hardware inputs or
outputs. Specially created applications use implicitly logic operations in order to control
complex functions e.g. controlling partitions.

Home and Building Management Systems KNX Association
Integrated Applications Integrated Applications_E0999b.doc 4/16