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Example 2
A disturbance interferes with the input value. The diagram shows the adjusted input value with the following settings:
Input ramp limitation = 4 = 0x07FF = 2047
Filter level = 2
16000
8000
16.3.2.3.2 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
Adjustable filter levels:
Value
0
1
2
3
4
5
6
7
Data sheet V1.21
Eingangswert
intern nachgeführter Eingangswert vor dem Filter
Störung (Spike)
0
1
2
3
Figure 26: Adjusted input value for disturbance
-
= Value
New
Old
Filter level
Filter switched off
Filter level 2
Filter level 4
Filter level 8
Filter level 16
Filter level 32
Filter level 64
Filter level 128
X20(c)CP1301, X20CP1381 and X20CP1382
4
5
6
7
8
Value
Input value
Old
+
Filter level
Filter level
t [ms]
37
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