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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
Room operating modes
28 Feb 2009
5.3.1
Local control of room operating mode via
a window contact
S
Central
Local
1.
2.
3.
S
DI
S
S
S
DI
S
3.
Controller
Prio
PPS2
3.
S
Whenever a window is opened, the room controller
always switches to the
Protection
room operating
mode, i.e. the heating or cooling output is reduced to a
minimum. If a window is opened outside the "building-
in-use" period it is also possible, for example, to
arrange for this to trip an alarm in the building
automation and control system.
The table below shows the
effective room operating mode
as a function of the
Window
contact
input.
Status of window
contact
Effective room operating mode
Window closed
No effect.
Operating mode is determined by inputs with a lower priority
Window open
Protection mode
The window contact is connected directly to a digital input on the room controller (see
page 126). Alternatively an EIB/KNX window contact (connected to the bus) may be
used. The application evaluates both items of information (logic OR operation).
Since EIB/KNX window contacts are available from a variety of manufacturers, the
name of the S-mode output communication object varies accordingly.
Room controller RXB...
Window contact input
EIB / KNX window contact
10385Z10en
Window contact output
OR
Window contact on DI
The following S-mode communication object is used to integrate an EIB/KNX window
contact:
Window contact input (Input communication object)
Flags
R
W
C T U
Type
Receive timeout
States
0 1 1 0 0 1.019
DPT_WindowDoor
No
0 = Closed
1 = Open
Effective
room operating mode
Window contact
KNX
R
CO
