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Siemens
RXB (KNX) Applications library
CLC and RAD description of functions for CC-02 CM110384en_03
Building Technologies
Control sequences
28 Feb 2009
Safety zone
Flow temperature
Central dew point temperature
Dew point temperature in room
t
Temperature
Cooling disabled
80317
8.2.6
Central/passive dewpoint monitoring
The dewpoint can be monitored in two ways:
– A dewpoint sensor with a potential-free contact is connected directly to a digital input
of the room controller (see page 102).
– Dewpoint sensor via bus.
The two inputs are OR-linked: If one is active, dewpoint alarm applies.
RXB... Room controller
EIB / KNX Dewpoint sensor
10384z102en
Room dewpoint alarm input
DI
OR
Room dewpoint alarm output
Since EIB dewpoint sensors are available from a variety of manufacturers, the name of
the EIB output communication object varies accordingly.
The following KNX input communication object is used to integrate a dewpoint sensor
connected to the KNX bus:
Room dewpoint alarm input (input communication object)
Flags
R W C T U
Type Receive
timeout
States
0 1 1 1 1 1.005
DPT_Alarm
Yes
0 = No alarm
1 = Alarm (condensation)
The dewpoint monitoring status (result of the OR operation) can be evaluated in the
building automation and control system using the following communication object.
Room dewpoint alarm output (output communication object)
Flags
R W C T U
Type Send
heartbeat States
1 0 1 1 0 1.005
DPT_Alarm
Yes
0 = No alarm
1 = Alarm (condensation)
KNX
R
CO
