# How can I determine the time t when a specific value y is reached in SIMULINK?

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Enea Baumann le 11 Jan 2021
Commenté : Timo Dietz le 11 Jan 2021
Hi everyone,
I'm working on a simulation on SIMULINK which outputs me a value y(t).
I now want to know at what time y(t) reaches a specific value y_1.
So I need to determine t(y_1) = t_1 and somehow display it in SIMULINK?
Also I want to used that value t_1 for further calculations.
Is there any block that I can use for that?
Best regards
Enea
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### Réponse acceptée

Timo Dietz le 11 Jan 2021
There are multiple ways of doing this. One is to attach the source block "clock" to a triggered subsystem which contains just a connection between in and out. The trigger input is fed by a comparator which checks for y(t) = y_1.
The triggered block now takes over the simulation time input to its output only in case the comparator triggers.
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Enea Baumann le 11 Jan 2021
Sorry for that.
I was able to solve it. As you said I put eq1' and eq2 into a enabled subsystem.
The subsystem is enabled as soon as t_1 is reached (calculated by eq1).
The subsystem's input is t_1.
This way, inside the subsystem eq1' is computed feeding its output to eq2 and and t_1 is obtained by eq1.
Thanks for your help!
Timo Dietz le 11 Jan 2021
Perfect! This is what I tried to explain. Good luck, furthermore.

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