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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
Control sequences
28 Feb 2009
8.6.4
Overriding the outside air damper
For test purposes, the outside air damper can be overridden via the following
communication objects:
Damper override (Input communication object)
Flags
R W K T U
Type Receive
timeout
Value
0 1 1 0 0 8.010
DPT_Percent_V16
no
0...100%
0 = 0%
+100 = +100%
+32767 = invalid
Before the outside air damper can be overridden, the test mode must be activated via
the communication object
Application mode
8.7
Room supply air cascade control (FNC08)
Room supply air cascade control makes it possible to reach the required room
temperature very quickly. On the basis of the measured room temperature, the
controller calculates a setpoint for the temperature at the air outlet of the fan coil.
A limit value can be applied to this temperature to prevent the introduction of
uncomfortably cold / warm air into the room.
This function is not available for electric heaters, as these cannot be controlled well
enough with RXB controllers.
T
T
Room
Fancoil
Room sensor
Discharge air
sensor
Room controller FNC08
Setpoints room
Controller
disch. air
Actual room temp.
Actual
disch. temp.
Setpoints disch. air (internal)
Controller
room
Positioning
signals
Max. disch. air
Min. disch. air
H
C
H
C
10
38
5z
12
1e
n
This function is possible in conjunction with
motorized valve actuators only
.
KNX
R
CO
Note
STOP
Note!
