Page 248 - Advanced Course

KNX ADVANCED COURSE

5.1.5 Linking Group Addresses (1)

The KNX system is used in a school building for signal and monitoring functions. The
following additions should increase the security of the building:

The message ‘Window open’, which is already indicated on a display unit, should be
extended into an alarm signal (protection against danger) at a particular time of day
and sent via a telephone modem with bus capability to the technical supervisor
(caretaker).

The task involves assigning new addresses and parameters to the corresponding
components for alarm indication and commissioning them.
The solution can be implemented for example with a logic module with 4 x 2 inputs. The
existing group address for the message ‘Window open’ is linked in the logic module as an
input address to a second group address for ‘Alarm duration’ using an AND function to
form a new output group address ‘ALARM – Window open’.

Grp. Addr. Meaning of the group addresses

0/11 Message ‘Window open’

/13 Alarm duration

0/15 ‘ALARM - Window open’; selection by Tele-Control

Figure 17: Logic module 4 x 2 inputs

Home and Building Management Systems KNX Association
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