X20 system modules • Analog input modules • X20AI4322
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X20 system User's Manual 3.10
4.3.10.8.5.2 Filter level
A filter can be defined to prevent large input jumps. This filter is used to bring the input value closer to the actual
analog value over a period of several bus cycles.
Filtering takes place after input ramp limitation.
Formula for calculating the input value:
Value
New
= Value
Old
-
Value
Old
Filter level
+
Input value
Filter level
Adjustable filter levels:
Value
Filter level
0
Filter switched off
1
Filter level 2
2
Filter level 4
3
Filter level 8
4
Filter level 16
5
Filter level 32
6
Filter level 64
7
Filter level 128
The following examples show how filtering works in the event of an input jump or disturbance.
Example 1
The input value jumps from 8,000 to 16,000. The diagram shows the calculated value with the following settings:
Input ramp limitation = 0
Filter level = 2 or 4
0
8000
16000
t [ms]
Input jump
1
2
3
4
5
6
7
8
Input value
Calculated value: Filter level 2
Calculated value: Filter level 4
Figure 106: Calculated value during input jump
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