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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12 CM110385en_05
Building Technologies
Master/slave
28 Feb 2009
10 Master/slave
Example of a master/slave configuration: Several controllers are installed in an open-
plan office. One controller (the master) measures the room temperature and controls
the other controllers (slaves) via the KNX bus. This ensures that it will be possible to
subdivide the room into smaller rooms, without the need to change the wiring.
B
A
T
B
EIB / KNX-Bus
10
38
5Z
17
Master
Slave
Slave
Room 321
Room 322
Room 323
Controller A is configured as the master controller and controls the room temperature.
Controllers B are configured as slaves and operate in parallel with Controller A.
•
A slave controller may be controlled by
one
master controller only. A master,
however, can control any number of slaves, subject to the limits of the KNX system
(topology, bus load etc.).
•
Parallel operation of thermal valves among other factors primarily depends on the
supplied voltage. We recommend to parameterize "3rd Party Thermic" for thermal
valves regardless of make.
•
Master/slave bindings are only possible between controllers with the same version
(ASN), featuring the same applications and settings.
Parameter
Description
Master
Normal
control.
Slave
The slave controller is controlled by a master controller via the KNX
bus. The master and slave controllers operate in parallel.
The room temperature is measured only by the master.
STOP
Note!