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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
Select communication mode
28 Feb 2009
On the RMB795 central control unit, only the room group, that is, the "Geographical
zone (
apartment
)" can be set.
The room and the subzone use a fixed assignment (Room = 1, Subzone = 1).
This means that for setting a room group on the central control unit, following applies:
Room group
= geographical zone
(
apartment
.1.1).
The RXB room controllers offer the following setting choices:
– Geographical zone (
apartment
)
– Geographical zone (
room
)
– Geographical zone (
subzone
)
On HVAC applications using RXB… room controllers, it is only the "Geographical zone
(
apartment
)" and the "Geographical zone (
room
)" that should be used.
Extension of addressing by the “Geographical zone (
room
) " leads to room control with
RXB room controllers. This offers individual operational interventions (from an operator
unit or the central control unit via bus), such as room setpoint readjustments from any
of the rooms or devices.
The "Geographical zone (
room
)“ can be subdivided; for that, the RXB room controller
offers the "Geographical zone (
subzone
).
This subzone could be for use in plant where lighting conditions shall be taken into
consideration if, for example, a "Geographical zone (room)" shall be divided into the 2
subzones “Lighting window side” and “Lighting corridor side”.
For HVAC applications, the preset subzone = 1 should be left unchanged.
Suffixes (
apartment
), (
room
) and (
subzone
) are defined by Konnex, whereby
(
apartment
) has nothing to do with a living space or an apartment in the proper sense.
Each KNX user requires an individual device address – on the floor plan of the
preceding page shown as D:11x.
The device addresses in our example were assigned in accordance with the bus’
topology.
Settings on the
central control unit
Settings on the
room controllers
Significance of subzone
Significance of suffixes
The device address
