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KNX ADVANCED COURSE

Figure 18: Program sequence for cooling control

With the help of an event control system which uses the room temperature as an input
variable, it is possible to control the existing outputs very conveniently. When the
temperature increases, the cooling valve is opened first of all. If the temperature rises still
further the thresholds (freely selectable) for the individual fan levels are exceeded. A
scene recall object is therefore linked to each threshold which ensures that no other
scenes are started but that only the relevant scene is running. In our example, this could
mean that as a result of an interruption in the bus without an intermediate value, a
temperature of over 21°C would be reported. The events “Exceed 17, 18 and 19°C” would
not be activated simultaneously but would be disabled.

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