About chatter detection
To detect a faulty input device wired to the Sequence of Events device, the device can use Chatter Detection to detect a chattering signal from a device connected to one of its inputs (for example, rapid transitions from a failed contact) and ignore the data. If not accounted for, chatter can cause the device to timestamp invalid input transitions. Typically, chattering signals cause inputs to transition falsely many times in a relatively short period of time.
To configure Chatter Detection for an input, you must define an acceptable number of input transitions within a specific time period.
- If the number of input transitions meets the number specified in the configured time period, the device considers the point in chatter, the input device defective, and ignores the last transition (that is, clears any timestamp data for the transition from its buffer) and all subsequent transitions while still chattering.
- If the number of events in the specific time is less than your defined number, the input does not go into chatter and timestamps are produced for all transitions.
- If an input is chattering, the corresponding fault bit for that input is set.
- After a point is in chatter, all transitions on that input are ignored until the point is no longer chattering. An input is no longer chattering if the configured chatter time elapses and no new transitions occur on the input.
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