Operating Instructions

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Siemens RXB (KNX) Applications library CLC and RAD description of functions for CC-02 CM110384en_04
Building Technologies Setpoint calculation 21 Sep 2010
6 Setpoint calculation
6.1 Description
Each room controller knows 9 different room temperature setpoints:
One heating and cooling setpoint each for the room operating modes
Comfort,
Precomfort, Economy,
and Protection as well as Frost risk limit value.
The setpoints are:
Defined in the tool during engineering.
Adjusted during runtime by the communication objects (DESIGO, Synco).
This does not apply to Protection setpoints and Risk of frost limit values
(page 31).
The setpoints are shifted:
Centrally via KNX bus from the building automation and control system
(only
Comfort, Precomfort and Economy).
Locally via PPS2 by a room unit or a setpoint adjustment unit
(only
Comfort and Precomfort).
The controller controls the values internally to ensure that sensible periods are
adhered to between the various room operating modes.
The result are 8 present setpoints.
The Effective room operating mode selects one value each for heating and cooling
from the 8 setpoints. These are the
effective setpoints used by the controller.
Define Shift
Tool 6.1.3 Runtime 6.3 Central 6.4 Local 6.5
10385Z40en
Comfort heating setpoint
Comfort cooling setpoint
Precomfort heating setpoint
Precomfort cooling setpoint
Economy heating setpoint
Economy cooling setpoint
Protection heating setpoint
Protection cooling setpoint
Local setpoint shift
Central setpoint shift heating
8
present
setpoints
Effective
heating setpoint SpH
Effective
cooling setpoint SpC
HC
PPS2 KNX
Effective
room operating mode
Central setpoint shift cooling
Frost setpoint
KNX
KNX
KNX
KNX
PPS2
DI
KNX
KNX
(6.1.1)
(6.1.2)