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Siemens
RXB (KNX) Applications library
CLC and RAD description of functions for CC-02 CM110384en_03
Building Technologies
Room operating modes
28 Feb 2009
5.4.3
Central control of the room operating mode via the
schedules Use and Occupancy
Third-party S-mode does not support these schedules. If nevertheless used, the room
controller may produce 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
while the building is in use. Outside the building-in-use
period, it is disabled.
The presence detector has two states:
State
Description
Occupied
•
Room is occupied.
•
Room controller switches to
Comfort.
Unoccupied
•
Room is not occupied.
•
Room controller switches to
Economy
or
Precomfort.
•
The change in the
Effective room operating mode
is event-driven at exactly the time
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
last command wins.
Presence detector
New
Effective room operating mode
Æ
Occupied
(people enter room)
Precomfort
Æ
Unoccupied
(people leave 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 102); 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