Page 44 - Basic Course
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KNX BASIC COURSE
3 Topology - Area
Main line = line 0
PS/Ch
LC 1 LC 15
PS/Ch PS/Ch
DVC 1 DVC 1
DVC 63 DVC 63
Line 1 Line 15
1st line segment 1st line segment
Figure 3: Topology - area
If more than 64 bus devices are to be connected in an installation, then in the default
topology (without line extensions) up to 15 lines can be connected to a main line via line
couplers (LC). This line structure is called an area.
It is also possible to have up to 64 bus devices on the main line. The maximum number of
bus devices on the main line decreases by the number of line couplers used.
On each secondary line (in the default topology, the first line segment) but also on each
main line a power supply unit is required.
Line repeaters may not be used on the backbone or in main lines.
In the default topology (without line repeaters) up to 1,000 devices can be installed in an
area.
Home and Building Management Systems KNX Association
KNX TP Topology Topology_E1213a 5/24
