MATLAB: How to hold a true signal for a defined time after conditions are met in Simulink 8.3 (R2014a)

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How can I hold a true signal for a defined time after conditions are met in Simulink 8.3 (R2014a)?

Best Answer

Enabling a signal for a specified amount of time when triggered can be accomplished in several different ways in Simulink. The basic procedure to implement this type of logic is outlined, as follows:
1) Use a Simulink Clock block to get the current simulation time
2) Capture the current time when the enable/trigger event occurs
3) Disable the signal/enabled subsystem after the desired amount of time passes
See the attached example for an implementation with a MATLAB Function block using persistent variables.
More information on persistent variables in MATLAB Function blocks can be found, as follows:https://www.mathworks.com/help/matlab/ref/persistent.html
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