66/166
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
Presence detector
New effective room operating mode
No presence detector
Comfort
(default)
Æ
Unoccupied
(people leave room)
Economy
Æ
Occupied
(people enter room)
Comfort
Key: "
Æ
Occupied" means "changes to Occupied"
5.6.3
Local control of room operating mode with a room unit
Room unit
PPS2
Local
1.
DI
DI
3.
Controller
3.
Prio
The /Auto button on the room unit can be used like an
occupancy button.
The room user can use it to switch the HVAC system
"on"
or
"off"
.
The room unit is connected to the PPS2 interface on the room controller.
It displays the effective room operating mode in a simplified form, and can also be used
to change it.
State
Description
Auto
Effective room operating mode
is
Comfort
Reduced mode
in the room, depending on the Priority 1 or 3 influences:
Effective room operating mode
is
Precomfort, Economy
or
Protection.
•
The change in the
effective room operating mode
is event-driven, the key factor
being the moment when the button on the room unit is pressed.
•
The presence detector (which is also Priority 3) can cause the
effective room
operating mode
to change again
Æ
the last command always applies.
The table below shows the effect of the /Auto button on the
effective room operating
mode
of the room controller.
Existing effective
room op. mode
Display on
room unit
Manual operation of
the /Auto-button
New effective room
operating mode
Comfort
Auto
Æ
Precomfort
,
if
effective occupancy
=
Occupied
Economy
,
if
effective occupancy
=
Unoccupied
Precomfort
Æ
Auto
Comfort
Economy
Æ
Auto
Comfort
during Temporary
Comfort period
1)
Protection
Æ
Auto
Protection, unchanged
Effective
room operating mode
