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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
Control sequences
28 Feb 2009
Changeover is only possible if the
control sequence
parameter is set to changeover.
In this case, a changeover command (heating or cooling) is essential. In the absence of
the required information (e.g. due to problems with data communication), the controller
operates as follows:
– After a reset, the controller operates in heating mode until another changeover
command is received.
– If the transfer of data is interrupted, the controller remains in the last valid room
operating mode.
The changeover information must be transmitted to the bus and is integrated via the
following communication object:
H/C changeover input (Input communication object)
Flags
R W C T U
Type Receive
timeout
Value
0 1 1 0 0 1.100
DPT_Heat/Cool
yes
0 = Cooling
1 = Heating
The following communication object is used in LTE-mode:
H/C changeover (Input)
Possible partner function blocks
Known partner devices
ChangeOverStatusWater
Distribution zone, heating
Distribution zone, cooling
342 WCOS
Water Changeover Status Sensor
Siemens:
Synco RMU710 / 20 / 30
RMB795 / RMS705
8.1.3
Heating/cooling output
The controller makes its status (heating or cooling) available via the following
communication object:
Heating/cooling output (Output communication object)
Flags
R W C T U
Type Send
heartbeat
Value
1 0 1 1 0 1.100
DPT_Heat/Cool
yes
0 = Cooling
1 = Heating
The value of the Output as a function of the room temperature is shown in the following
diagram:
0 = Cool
TR
103
85D
201
SpH
SpC
1 = Heat
Value
Changeover
KNX
R
CO