Page 205 - Advanced Course

KNX ADVANCED COURSE

2.3.3 Flags

Figure 9: Changing the priority

A further option for the security and/or monitoring application is the configuration of the
flags. The “Alarm” priority guarantees that the telegram is forced through before other
telegrams with a lower priority and the appropriate measures are initiated promptly. Care
should be taken when selecting the priorities. If the “Alarm” priority is set for each object,
each telegram would be treated equally. See also the chapter “Fail-safe Planning”.

2.4 KNX Devices

2.4.1 Power Supply
For implementing the tasks of a security and/or monitoring system, KNX device
manufacturers offer power supplies which can be coupled with a battery module. Should
the mains voltage fail, the KNX bus is supplied with power for a limited period, depending
on the number of devices.

Operation Overload

12 V battery module

Figure 10: KNX power supply with uninterruptible supply and changeover contact for
remote signalling

Home and Building Management Systems KNX Association
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