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Parameter setting
Sensors Sewi KNX AQS and Sewi KNX AQS/TH-D
• Version: 10.09.2018 • Technical changes and errors excepted.
gramming" should not be used for the initial start-up, as the factory settings are always
used until the first communication (setting via objects is ignored).
Set the threshold value directly in the application program using parameters, or define
them via the bus using a communication object.
Threshold value setting using parameters:
Set the threshold values and hysteresis directly.
Threshold value setting using a communication object:
Define, how the threshold value will be received from the bus. Basically, a new value
can be received, or simply a command to increase or decrease.
During initial commissioning, a threshold value must be defined, which will be valid
until the first communication of a new threshold value. For units which have already
been taken into service, the last communicated threshold value can be used. Basically,
a range is specified in which the threshold value can be changed (object value limit).
A set threshold value will be retained until a new value or a change is transferred. The
current value is saved, so that it is retained in the event of a power supply failure and
will be available once the power supply is restored.
Set the
hysteresis
independent of the type of threshold value specification.
Maintain the
threshold values and delays received via
communication objects
• never
• after power supply restoration
• after power supply restoration and
programming
Threshold value setting using
Parameter
• Communication objects
Threshold value in ppm
0 … 2000; 1200
Threshold value setting using
Parameter •
Communication objects
Start threshold value in 0.1°C
valid until first communication
-300 … 800; 200
Limitation of object value (min)
in ppm
10…2000
Limitation of object value (max)
in ppm
1…2000; 1000
Type of threshold value change
Absolute value • Increase/decrease
Increment in ppm
(upon increase/decrease change)
1 • 2 • 5 • 10 • 20 • ... • 200
Hysteresis setting
in % • absolute
Hysteresis in ppm
0...2000; 500
Hysteresis in % of the threshold value
0 … 50; 20