Art. No. SC 1000 KNX
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Since the value for the basic setpoint shift is stored exclusively in volatile memory (RAM),
the shift will get lost in case of a reset (e.g. bus voltage failure).
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A setpoint shift does not affect the temperature setpoints for frost or heat protection!
Communication objects for the basic setpoint shift:
The controller tracks the current setpoint shift in the communication object "Current setpoint
shift" via the controller with a 1-byte counter value (acc. to KNX DPT 6.010 – representation of
positive and negative values in a double 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 increment in positive direction, the controller counts up the
value. The counter value will be counted down if there is a negative adjustment of the
temperature. A value of "0" means that no setpoint shift has been adjusted.
Example:
Starting situation: current setpoint temperature = 21.0°C / Counter value in "Feedback setpoint
shift" = "0" (no active setpoint shift)
After the setpoint shift:
-> A setpoint shift by one temperature increment in the positive direction will count up the value
in the "Current setpoint shift" object by one = "1".
-> Current setpoint temperature = 21.5°C
-> An additional setpoint shift by one temperature increment in the positive direction will again
count up the value in the "Current setpoint shift" object by one = "2".
-> Current setpoint temperature = 22.0°C
-> A setpoint shift by one temperature increment in the negative direction will count down the
value in the "Current setpoint shift" object by one = "1".
-> Current setpoint temperature = 21.5°C
-> An additional setpoint shift by one temperature increment in the negative direction will again
count down the value in the "Current setpoint shift" object by one = "0".
-> Current setpoint temperature = 21.0°C
-> An additional setpoint shift by one temperature increment in the negative direction will again
count down the value in the "Current setpoint shift" object by one = "-1".
-> Current setpoint temperature = 20.5°C, etc. ...
In addition, the controller’s setpoint shift can be externally adjusted via the communication
object "Preset setpoint shift". This object has the same data point type and range of values as
the object "Current setpoint offset" (see above). By connecting to the "Setpoint shift
specification" object 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
correspondingly. Values that lie within the possible value range of the basic setpoint shift can be
directly jumped to.
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.
Depending on the direction of the shift, the value feedback is set to the maximum value via the
communication object "Current setpoint shift".
Controller extensions connected to the controller via the aforementioned objects have to work
with the same step width as the controller (0.5 K)!
Transmitting the setpoint temperature
The setpoint temperature, which is given by the active operating mode can be actively
transmitted onto the bus via the 2-byte "Set temperature" object. The "Transmission at setpoint
temperature modification by..." parameter in the "Room temperature control -> controller
general -> setpoint values" parameter node determines the temperature value by which the
setpoint has to change in order to have the setpoint temperature value transmitted automatically
via the object. Possible temperature value changes lie within a range of 0.1 K and 25.5 K. The
setting "0" at this point will deactivate the automatic transmission of the set temperature.
Page 201 of 347
Software "Smart Control 501511"
Functional description
