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
5.5.5 Local control of room operating mode with a room unit
Room unit
PPS2
Central
(Synco controller)
Local
1.
2.
3.
DI
DI
3.
Controller
3.
Prio
1.
Central (ACS)
0.
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, 2 and 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 Effective occupancy can cause the effective room operating mode to change
again  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

Precomfort
If room operating mode
from time schedule
= Comfort or Precomfort
Economy
If room operating mode
from time schedule
= Economy
Precomfort

Auto
Comfort
Economy
 Auto Comfort during Temporary
Comfort period
1)
Protection mode

Auto
Protection, no change
Key:  Auto means: “changes to Auto”
1) Comfort mode is operative for the pre-defined Temporary Comfort period (see
page 143). The room controller then reverts to Economy.
Effective
room operating mode