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Communication objects for the basic setpoint shifting:
The controller tracks the current setpoint shift in the communication object 52 ("Current setpoint shifting") with a 1-
byte counting value (acc. to KNX DPT 6.010 – representation of positive and negative values in a 2's
complement). By connecting to this object the controller extensions are also able to display the current setpoint
shift.
As soon as there is an adjustment by one temperature step (0.5 °C) in positive direction, the controller counts up
the value by one digit. The counting value will be counted down by one digit, if there is a negative adjustment of
the temperature.
Thus the possible range of values for the object is determined by the setpoint's adjustment options. A value of "0"
means that no setpoint shift has been adjusted.
Example:
Initial situation:
The temperature step for the setpoint shift is set to 0.5 °K.
Current setpoint temperature = 21.0°C / counting value in object 52 = "0" (no setpoint shift active )
After shifting the setpoint:
- A setpoint shift by one temperature step in positive direction will count up the value in object 52 by one = "1".
Current setpoint temperature = 21.5°C.
- Another setpoint shift by one temperature step in positive direction will count up the value in object 52 again by
one = "2.. Current setpoint temperature = 22.0°C.
- A setpoint shift by one temperature step in negative direction will count down the value in object 52 by one =
"1". Current setpoint temperature = 21.5°C.
- Another setpoint shift by one temperature step in negative direction will count down the value in object 52
again by one = "0". Current setpoint temperature = 21.0°C.
- Another setpoint shift by one temperature step in negative direction will count down the value in object 52
again by one = "-1". Current setpoint temperature = 20.5°C.
etc.
The maximum possible range of values for the "Current setpoint shift" communication object depends on the
"Adjustment options of the basic setpoint temperature upwards/downwards" parameter. A parameterization of
± 10 K at this point will have the value of the object move within the limits –20 ... +20.
In addition, the setpoint shift of the controller can be externally adjusted via communication object 53 ("Setpoint
shift preset"). This object has the same datapoint type and range of values as object 52 (see above). By
connecting to object 53, the controller extensions are able to directly adjust the current setpoint shift of the
controller.
As soon as the controller receives a value, it will adjust the setpoint shift accordingly. Each value increment
corresponds to a temperature step of 0.5°C (cf. example above). Values that lie within the possible range of
values can be approached directly.
The controller monitors the received value independently. As soon as the external preset value exceeds the limits
of the adjustment options for the setpoint shift in positive or negative direction, the controller will correct the
received value and adjust the setpoint shift to maximum shift. Depending on the direction of the shift, the value
feedback is set to the maximum value via communication object 52 ("Current setpoint shift").
Effect of the control wheel in conjunction with the external setpoint shift preset:
An external setpoint shift (preset, for instance, at a controller extension) overrides a temperature shift last
adjusted on the controller with the control wheel. The opposite case is equally valid: a change of the control wheel
position overrides an externally preset setpoint shift.
Thus, the value of the feedback via communication object 52 ("Current setpoint shift") always corresponds to the
shift last performed.
07/17
Subject to change without notice
instabus KNX/EIB System
Sensor
2100-xx/2101 xx Page 53/82
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