Operating Instructions

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Siemens RXB (KNX) application library RXB Description of functions for FC-10, FC-11, FC-12, FC-13 CM110385en_08
Building Technologies Room operating modes 2013-06-17
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  the last command always applies.
Presence detector New effective room operating mode
 Unoccupied
(people leave room)
Precomfort
 Occupied
(people enter room)
Precomfort if room operating mode from schedule
= Comfort or Precomfort
Economy if room operating mode from schedule
= Economy.
Key: " Occupied" means: "Changes to Occupied"
The presence detector is connected directly to a digital input on the room controller
(see page 142); 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