Change detection using simulink

Question

Abhibrata Adhikary 2020-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/514880-change-detection-using-simulink

回答： Ameer Hamza 2020-4-2

Hi All,

I need some help buliding a simulink logic for the following case:

I have a column with various states changing from 1 to 6 as shown in the below image.
And I would like to implement a simulink logic to determine how many samples were there in each state before it changed to a new state.
As soon as the state changes, it should reset its counter and start counting the next state

I would be really grateful if you could help me understand on how to approach the problem.

Thanks

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Ameer Hamza 2020-4-2

How do you define samples in this case. Do you mean time-steps?

Abhibrata Adhikary 2020-4-2

yes

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Answer 1

Birdman 2020-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/514880-change-detection-using-simulink#answer_423617

changeDetection.slx

I tried to make a model for you, where I tried to build a signal based on your description. Please click on the Signal Builder block and check it. Then, by using Detect Change block, I tried to capture the change in the input signal and with that each change, I reenabled a counter located in a Enabled Subsystem and it started counting again. Please run the simulation and open the Scope in the model. You will see that the counter is reset at every change and where it is reset, in the Scope, you will see that at values 4, 8, 12, 7 and 4, just as in the question, the counter is reset. Check the model and try to understand it and try to adapt it according to your purpose.