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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
5.6
Determine the room operating mode without
a bus (stand-alone)
If no bus is connected, the e
ffective room operating mode
of the room controller
depends on local influences such as window contacts, presence detectors or room
units.
The diagram below shows how these influences are processed by the room controller,
and their priority:
PPS2
Local
1.
DI
DI
3.
Controller
3.
Window contact
Presence detector
Room unit
Prio
10
3
85
Z
58
•
The effects of
Priority 1 and Priority 2
are similar in nature to the
states
, which
apply continuously
•
The
Priority 3
influences are treated as
events
.
The key point in time is the moment at which the state changes (trigger edge).
If the mode is later changed by another source of priority 3,
the last change
applies.
If there is no bus connection, the controller assumes the following defaults:
•
Use
=
Building in use
•
Occupancy
=
Occupied
STOP
Note!
Note
