Central/Passive Dewpoint Monitoring - Siemens Desigo RXB Technical Manual

K N X
CO
R
Siemens
Building Technologies
Temperature
Cooling disabled
Flow temperature
Central dew point temperature
Dew point temperature in room
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.
EIB / KNX Dewpoint sensor
Room dewpoint alarm input
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 Type
R W C T U
0 1 1 1 1 1.005
DPT_Alarm
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 Type
R W C T U
1 0 1 1 0 1.005
DPT_Alarm
RXB (KNX) Applications library
Control sequences
80317
Safety zone
t
RXB... Room controller
DI
OR
Receive timeout
Yes
Send heartbeat
Yes
CLC and RAD description of functions for CC-02 CM110384en_03
Room dewpoint alarm output
10384z102en
States
0 = No alarm
1 = Alarm (condensation)
States
0 = No alarm
1 = Alarm (condensation)
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28 Feb 2009