Sensor Correction; Temperature Sensor Outputs On The Konnex Bus - Siemens Desigo RXB Technical Manual

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Return air temperature
Note
78/166
Siemens
Building Technologies
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
+
O
R
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
Type
R W C T U
1 0 1 1 0 9.001
DPT_Value_Temp
Invalid temperatures are mapped to the bus as 0 °C.
RXB (KNX) application library
Temperature measurement
Room tempearture output
Effective room temperature
Return air temperature output
Send heartbeat
yes
FNC Description of functions for FC-10, FC-11, FC-12
10385Z15en
Value
Floating point (°C)
CM110385en_05
28 Feb 2009

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