Chapter 19 Exclusive Functions for Event Input Module
19-15
7)Chatter Setting
Chatter setting enables the module to identify an event repeated many times during a short period of time as
chattering, and not an effective event. Some sensors using mechanical contacts may cause chattering, which
can be eliminated with this function.
1. Setting items
a. Number of events: 2~127 (‘0’: detection is disabled)
b. Event number: enter the number of the events including the first effective signal (min. 2)
c. Chatter detection time (duration): if this chatter detection time has been passed from the time the first
effective event was detected, the chatter detection function for the specific event frequency will be
terminated, even if the set-up number of chattering has not been completed.
d. Min. chatter detection time (duration): co-related with the set up chattering event number.
In addition, since an event has passed the input filter, it should satisfy following criteria;
(Number of Events × Input Filter Value) ＜ Chatter Detection Time (Duration)
or,
Input Filter Value ＜ (Chatter Detection Time (Duration) ÷ Number of Events )
E.g.) If, chatter detection time = 30ms, number of chattering events = 5,
30ms ÷ 5 = 6ms,
therefore, the input filter must be less than 6ms.
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