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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
5.4.5
Local control of room operating mode with a room unit
Room unit
PPS2
S
Central
Local
1.
3.
S
DI
S
S
DI
3.
Controller
1.
3.
Prio
3.
S
S
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 and 2
influences as well as the
Room operating mode
schedule:
The
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 point at which the button on the room unit is pressed.
•
The
Effective occupancy
or
Temporary Comfort mode
(both 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
/Auto button
New effective
room
operating mode
Comfort
Auto
Æ
Precomfort
If room operating mode
from time schedule
=
Comfort
or
Precomfort
Economy
If room operating mode
from time schedule
=
Economy
Precomfort
Æ
Auto
Comfort
Economy
Æ
Auto
Comfort
during
Temporary
Comfort
period
1)
Protection mode
Æ
Auto
Protection
mode, no change
Key: "
Æ
Auto" means: "Changes to Auto"
1)
Comfort
mode is operative for the pre-defined
Temporary Comfort
period (see
page 126). The room controller then reverts to
Economy.
Effective
room operating mode
