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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
5.4.3
Central control of room operating mode via the
Use
and
Occupancy
time schedules
These time schedules are not supported by third-party S-mode. If they are used
nevertheless, this can cause room controller errors.
5.4.4
Central and local control of room operating mode
based on occupancy
Presence detector
PPS2
S
Central
Local
1.
3.
S
DI
S
S
DI
3.
Controller
1.
3.
Prio
3.
S
S
A presence detector detects the presence of people in
a room.
It controls the room operating mode of a room controller
throughout the period when the building is in use.
Outside the building-in-use period, it is disabled.
The presence detector has two possible states:
State
Description
Occupied
•
The room is occupied
•
The room controller switches to
Comfort
Unoccupied
•
The room is not occupied
•
The room controller switches to
Economy or Precomfort
•
The change of
effective room operating mode
is event-driven, the key factor being
the moment when the
effective occupancy
changes.
•
The room unit or
Temporary Comfort mode
(both Priority 3) can cause the
effective
room operating mode
to change again
Æ
the last command always applies.
Presence detector
New effective room operating mode
Æ
Unoccupied
(people leave room)
Precomfort
Æ
Occupied
(people enter room)
Precomfort
if room operating mode from schedule
=
Comfort
or
Precomfort
Economy
if room operating mode from schedule
=
Economy.
Key: "
Æ
Occupied" means: "Changes to Occupied"
The presence detector is connected directly to a digital input on the room controller
(see page 126); alternatively an EIB/KNX presence detector connected to the EIB/KNX
bus may be used (see diagram below).
The two inputs are OR-linked: If one signals presence, presence applies.
Effective
room operating mode
Presence detector
