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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
5.4.1
Local control of room operating mode via the
window contact
input
PPS2
S
Central
Local
1.
3.
S
DI
S
S
DI
3.
Controller
1.
3.
Prio
3.
S
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.
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
Type
Receive timeout
States
R W C T U
0 1 1 0 0 1.019
DPT_WindowDoor
No
0 = Closed
1 = Open
Effective room operating
mode
Window contact
KNX
R
CO