Page 219 - Basic Course

KNX BASIC COURSE

11.2 Task definition

Now, you have to assess, if
one bus line segment is sufficient or if two are needed
which bus telegram load can be expected?

The underneath explanations show that this assessment can lead to substantial
differences, which can influence the success and failure of the KNX technology.

You can now use ETS first in order to select possible bus devices:

From the great quantity of available devices, the following could have been selected:

11.2.1 Parts list for solution 1:
Per room:

3 switch/dimming actuators (1-channel)
1 brightness controller
1 valve drive
1 contact interface with 2 inputs
1 heating controller
1 display with at least 6 display functions
1 x 2-channel shutter actuator
4 x 2-fold push-buttons
1 logic module for the light/shutter group signals
1 logic module for the connection of the window contacts
___________________________________________________________________
15 devices
x 8 = 120 devices

In addition:

1 logic module for the conversion of analogue threshold values into binary signals
(shutter)
3 logic modules for - all windows, - all shutters, - all lights

1 information panel
1 time switch
1 weather control unit
_______________________________________________________________________
makes exactly 127 devices

When taking into account the reserves, 2 lines and a main line are therefore
necessary

Home and Building Management Systems KNX Association
KNX Project Design with ETS: Advanced ETS4_Planning complex_E0411c 43/59