Page 202 - Advanced Course

KNX ADVANCED COURSE

2.2 Installation and Topology

2.2.1 Installation
When using KNX for simple security and monitoring applications as well as for further
functions, certain features should be noted when installing the low current cable. The
basic principle is that the medium must be protected. The cabling between the devices in
the surface-mounted version could be implemented e.g. with steel conduit instead of
plastic conduit. Versions with open cabling systems should be avoided if security and/or
monitoring functions are planned for the segment/line or area.

2.2.2 Topology
When setting up new installations or extending the functions of existing installations, it is
advisable to set a topology in which the devices for security and/or monitoring applications
are either put on the main line or in exclusive lines/areas depending on the number of
devices. The benefit of this type of topology is keeping the bus load low. Commands such
as switching on and dimming the lighting or regulating the installation by the user could
send out security-related telegrams with a delay. The consequences would be either false
alarms or fault signals.

Figure 4: Structure of the lines

Figure 5: Example of devices used

Home and Building Management Systems KNX Association
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