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Siemens RXB (KNX) application library FNC Description of functions for FC-10, FC-11, FC-12 CM110385en_05
Building Technologies Temperature measurement 28 Feb 2009
In fan coils with a return air sensor (at B1), the controller must be configured
accordingly (see page 115).
– The temperature sensor in the room unit is ignored in this process (the signal is not
averaged).
– A QAX34.1 room unit displays the value of B1.
7.1.4 Sensor correction
The value of the local sensors (PPS2 and B1) can be corrected in the tools
(see page 140), but not the value of a bus sensor.
7.1.5 Temperature sensor outputs on the Konnex bus
To map the local temperature measurement in a building automation and control
system the following three output communication objects are used:
RXB... Room controller
10385Z15en
R
O
+
Return air temperature output
Effective room temperature
Room tempearture output
The values of the communication objects
Room temperature output and Return air
temperature output are unfiltered (not smoothed).
Sending takes place only if room "Room" is parameterized for the temperature sensor
B1.
The value transmitted as the
Effective room Temperature is the filtered (smoothed)
value of the communication object Room temperature output or Return air temperature
output, or the average (see 7.1.3):
Room temperature output (Output communication object)
Effective room temperature (Output communication object)
Return air temperature output (Output communication object)
Flags
R W C T U Type Send heartbeat Value
1 0 1 1 0 9.001
DPT_Value_Temp
yes Floating point (°C)
Invalid temperatures are mapped to the bus as 0 °C.
Return air temperature
Note