Number Of Signal Changes; Monitoring Window - Siemens Simatic S7-1500 Manual

Recognizing unusual signal patterns
An assigned monitoring window is available for each input channel. The monitoring window
starts with the first signal change of the input signal. If the input signal changes within the
monitoring window at least as often as the assigned "Number of signal changes", a chatter
error is detected. If no chatter error is detected within the monitoring window, the next signal
change restarts the monitoring window.
If a chatter error is detected, a diagnostic is signaled. If the chatter error does not occur for
the monitoring window for three times the configured period, the diagnostic is reset.
Principle
The figure below shows the principle of chatter monitoring as a graphic.
Image 4-1
4.2.4.6

Number of signal changes

Sets the number of signal changes after which a chatter error should be reported (value
range: 2 to 31).
4.2.4.7

Monitoring window

Sets the time for the monitoring window of flutter monitoring.
You can set times of 1 s to 100 s in whole seconds for the monitoring window.
Enter 0 to configure a monitoring window of 0.5 s.
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA
Figure chatter monitoring
Parameters/address space
4.2 Explanation of parameters
29