Local Control Of Room Operating Mode With A Room Unit - Siemens Desigo RXB Technical Manual

Room unit
Effective
room operating mode
Existing effective
room op. mode
Comfort
Precomfort
Economy
Protection mode
52/166
Siemens
Building Technologies
5.4.5

Local control of room operating mode with a room unit

Central Local
Controller
Prio
S
1.
DI
1.
3.
S
S
3.
DI
3.
PPS2
3.
S
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
The table below shows the effect of the
mode of the room controller.
Display on
room unit
Auto
Key: " 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.
RXB (KNX) application library
Room operating modes
The /Auto button on the room unit can be used like an
occupancy button.
S
The room user can use it to switch the HVAC system
"on" or "off" .
S
/Auto button on the effective room operating
Manual operation of
/Auto button
Auto
Auto
Auto
FNC Description of functions for FC-10, FC-11, FC-12
the last command always applies.
New effective room
operating mode
Precomfort
If room operating mode
from time schedule
= Comfort or Precomfort
Economy
If room operating mode
from time schedule
= Economy
Comfort
Comfort during Temporary
1)
Comfort period
Protection mode, no change
CM110385en_05
28 Feb 2009