How to detect unchanged signal over a length of time in Simulink?

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Vineeth Bharadwaj P
编辑： Vineeth Bharadwaj P 2018-2-14
Hello all,
I have been working on a simple project where I need to detect if a signal is remaining unchanged over a prescribed period of time (eg., 5 seconds). I can use the 'detect change' block, but it only compares the signal change value with the previous time instant. Is there any way to do this efficiently without writing a custom matlab function?

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