Page 178 - Advanced Course

KNX ADVANCED COURSE

lighting and b) minimum brightness level above which the light should be switched off.
Moreover, the control module must be in a position to carry out a hysteresis in order to
ease control in the extreme range between switched on and switched off.

Figure 14: Characteristic curve for brightness control – a hysteresis is advisable

5.2.2 Two-step Control
The characteristic curve described in the previous section is further simplified if only two
states are possible for the controlled lamps: ON or OFF.

Switching value
Switch Off point
1

Hysteresis

Switch On point

0
0 2000 4000 6000 [ lux ]
Measured value of brightness sensor
Figure 15: Principle of two step control

Home and Building Management Systems KNX Association
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