Page 187 - Basic Course

KNX BASIC COURSE

4.1 Structuring and planning reserves

In the diagram above, you can see how to create many areas and lines in a project: 15
areas, and in each area 16 lines. You can see by the name how the topology could be
aligned to the building structure. This of course depends on the size and structure of the
relevant project. There is no single model solution for this! It is advisable to design a
larger project completely without topology and to establish the assignment in the topology
after completion of the project design. What is the best way to proceed?
Observe a reserve of approximately 20% per line segment (i.e. for maximum 64 bus
devices, this amounts to approximately 50 bus devices).
Central devices should be installed in main lines or in backbone lines.
Devices of connecting room groups should also be put in the same line segment
(under no circumstances several segments in a room should be mixed, unless the
upper limit of 64 (or 50 with reserve) has been exceeded. In that case, this should be
clearly documented!)
On the same floor (or in the same house) you should if possible only install one area
(do not fill up when 1 or 2 lines are free).

4.2 Support from ETS when setting up larger size topologies:

4.2.1 Creating several areas

Home and Building Management Systems KNX Association
KNX Project Design with ETS: Advanced ETS4_Planning complex_E0411c 11/59