13.6.3 Flutter monitoring
Description
Flutter monitoring is a process control function for digital input signals. It detects and reports
signal characteristics unusual in process engineering, e.g. too frequent uctuation of the input
signal between "0" and "1". If signal characteristics like these occur, it is a sign that the sensors
are faulty or that there are instabilities from a process engineering viewpoint.
Activation of chatter monitoring
You activate the chatter monitoring by setting the number of signal changes for the chatter
monitoring to a value which is not "zero".
Recognizing unusual signal patterns:
Each input channel has a monitoring window that has been assigned parameters. The
monitoring window is started the rst time upon a signal change of the input signal.
The number of signal changes is monitored in the monitoring window. The reaction of the
system depends on whether the congured number of signal changes is reached within the
monitoring window:
• Number of signal changes is not reached.
With the next signal change the monitoring window is restarted.
• Number of signal changes is reached.
The event is recognized as chatter error.
Reporting a chatter error
If a chatter error is detected, the following occurs:
• The current signal state is entered into the process image.
• The value status of the signal is set to "invalid".
• The "Chatter error" diagnostic information is entered and an incoming diagnostic interrupt is
triggered.
The value status and the diagnostic information must be evaluated and processed in the user
program.
Resetting a chatter error
If no chatter error was detected within the triple monitoring window, the diagnostic entry is
removed and an outgoing diagnostic interrupt is triggered. The value state of the current signal
in the process image is set to "valid".
Digital electronic modules
13.6 Description of the parameters of the digital electronic modules
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK 341
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