ABB i-bus KNX Product Manual page 67

®
ABB i-bus KNX
Parameters
7.4.1.6.4 —
Dependent parameter
Weighting of external measurement 2
This parameter is only visible if the 2 option has been selected in the Number of temperature input objects
parameter.
Options:
This value specifies the weighting with which the external measurement 2 is to flow into the calculation of
the actual temperature.
If the sum of the total weighting values is greater than 100 %, the ratio of the values is formed and
the result then scaled back to 100 %.
Example 1:
Value 1 = 20 %
Value 2 = 80 %
Value 2 is taken into account with four times the weighting of value 1.
Expressed in figures:
Value 1: 20 °C; weighting 20 %
Value 2: 25 °C; weighting 80 %
((20 °C × 0.2) + (25 °C × 0.8)) / (0.8 + 0.2) = 24 °C
Example 2:
3 values: If 50 % is entered as the weighting for all three values, all values have the same weighting and
a mean value is simply formed from the three values.
Example 3:
2 values: The weighting 80 % applies to value 1 and the weighting 40 % to value 2, value 1 is therefore
taken into account in the calculation with twice the weighting of value 2.
Expressed in figures:
Value 1: 21 °C; weighting 80 %
Value 2: 24 °C; weighting 40 %
((21 °C × 0.8) + (24 °C × 0.4)) / (0.8 + 0.4) = 22 °C
If only the external measurement is used and the value 0 % selected as the weighting for both
measurements, the value received as external temperature 1 is always used as the valid temperature
value.
0...50...100 %
Note
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 65