di21 = 21: I1 + I3 + I5
Thereby input I1 receives the value 1, input I3 the value 2 and input I5 the value 4.
Inputs I1 and I3 are set:
Index = 1 + 2 = 3
Inputs I3 and I5 are set:
Index = 2 + 4 = 6
The actual index (after passing the filter and strobe unit) can be read out in ru58 actual
index.
7.1.9.3.2 Index filter
A filter time for the index calculation can be set in parameter di22 index noise filter.
Filter time of the index value in 0.5 ms resolution
Value 0 means that the calculated index value from the digital inputs is not filtered and
immediately accepted as valid index. This can cause problems if the digital inputs are not
set exactly at the same time.
If a filter time is entered, a new index is only accepted as valid index if it remains constant
for the adjusted time.
Figure 121: Example for the index filter
After the unfiltered index has remained constant for the filter time (4ms), it is accepted as
a valid index.
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