Trigger at start of simulation

Question

Shehryaar Ali 2022-2-14

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https://ww2.mathworks.cn/matlabcentral/answers/1649300-trigger-at-start-of-simulation

回答： Benjamin Thompson 2022-2-14

I have a triggered system in Simulink, that works perfectly excepts it needs to be triggered once at the start of simulation to start working. Kindly tell me a way to mitigate the issue.

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Answer 1

Benjamin Thompson 2022-2-14

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https://ww2.mathworks.cn/matlabcentral/answers/1649300-trigger-at-start-of-simulation#answer_895945

initialTrigger.slx

One way is using an Initial Condition block per my attached example. I use an enabled subsystem in the example because a triggered subsystem by definition needs a second time step to satisfy the conditions of the trigger. The same example also uses a clock source to compare to time zero, which is another way to have a signal that is true only at the start of simulation.