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V-RTU2000 Series
Veesta - Remote Terminal Unit
Technical Specification Manual
2.2.1.4 De-bounce filter
2.2.1.5 Chatter Filter
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Sequence capturing (1-Bit MCD): is optimized for a multiple
change detects technique which ensures that the critical
information is not lost, but avoids sacrificing the efficiency of the
communications process. This is accomplished using only a
single bit for each monitored indication point in the protocol.
De-bouncing used to verify that a digital input point has actually
changed state.
De-bouncing Filter time
Signal
Contact bounce
Signal after
debounce filter
Time-Stamp of State change
Figure 2-4: V-RTU2000 De-bounce Filter Diagram
A facility that is used to disable a digital input point if the number of
state changes of that point is excessively high during a defined time
interval.
Chatter Times (changes): The maximum allowed number of state
transitions that can occur within a filter base (Times Base) period. If
the number of state transitions during a filter period equals or
exceeds the maximum allowed number of state transitions, chatter
filter will turn ON and any further transitions will be ignored for the
duration of the "lock-out" period.
Lock Out Time: The minimum number of filter base periods (Times
base) during which the chatter filter will remain ON. The chatter filter
can proceed from ON to OFF only if no state transitions are detected
during the entire lock-out period.
Chapter 2 - System Overview
State change recognition
Page 16 of 90
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