Theben KNX Series Handbook page 38

4.6.2 Actual value
On this parameter page the source is selected which is used as the actual value for control. This
can be the temperature sensor integrated in the device, an external sensor, or a combination of
up to 3 sensors.

The control actual value might, depending on the selection of the source for the actual
value, deviate from the internally measured temperature (object temperature value).
Designation
Source for actual value
Send control actual value in the
event of change of
Send control actual value
cyclically
The selection possibilities with I3 are only available when the external inputs for temperature
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measuremet are set, i.e. function of the external inputs I3 +I4 = temperature sensor input (see
parameter page General).
RAMSES 718 P / RAMSES 718 S
Values
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Internal sensor
External actual value
object
Average value of
internal + ext. actual
value object
Sensor at I3
Average value from
internal
+ I3
Average value I3
+ Obj. Ext. actual value
Average value of
internal
+ I3 + obj. actual ext.
actual value
not due to a change
0.2 K, 0.3 K, 0.5 K, 0.7 K
1 K, 1.5 K, 2 K
no
yes
The application programmes RAMSES 718 P/S
Description
Control actual value.
The device measures and
controls the room temperature
via the internal sensor. (Control
actual value = internally
measured temperature).
The room temperature is solely
acquired via the bus.
The device calculates the average
value of the room temperature
received from the bus and the
internal measurement.
External sensor at I3.
Average value of the internal
value and the value measured at
I3.
Use average value of I3 and bus.
Use average value from 3
sources: I3 + internal + bus.
only cyclical sending possible.
Minimum change for resending.
Only send in the event of a
change.
Send in the event of a change
and cyclically.
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