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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
5.4.5
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 a
presence button.
The room user can enable or disable HVAC control.
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 operation in the room, dependent on 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 event being
the moment when 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
last command wins.
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
Room unit
display
Manual operation of
/Auto button
New
Effective room
operating mode
Comfort
Auto
Æ
Precomfort
If room operating mode from
schedule
=
Comfort
or
Precomfort.
Economy
If room operating mode from
schedule
=
Economy.
Precomfort
Æ
Auto
Comfort.
Economy
Æ
Auto
Comfort
for Temporary
Comfort period
1)
.
Protection.
Æ
Auto
Protection, unchanged.
Key:
Æ
Auto means: "changes to Auto ".
1)
Comfort
mode is active for the predefined
Temporary Comfort
period (see page
103). The room controller then returns to
Economy.
Effective room operating
mode