Siemens SIMATIC ET 200SP Manual page 29

Interrupts/diagnostics alarms
5.5 Chatter monitoring
Chatter monitoring and "settling time" if a chatter error occurs
Does the monitoring time in the event of a fault restart as three monitoring windows if the
signal continues to change?
The signal changes...
once more often than set in the "Number of signal changes". Monitoring time is restarted.
less often than set in the "Number of signal changes".
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Result
The monitoring time is not started again, in other words, the
monitoring time runs once after a chatter error is detected.
Even a change just before the time is up is tolerated.
DI 8xNAMUR HF digital input module (6ES7131-6TF00-0CA0)
Manual, 02/2014, A5E03894478-01