When the Boolean input $u$ becomes $\mathrm{true}$, the timer starts and the output $y$ is the time that has elapsed since $u$ became $\mathrm{true}$. When the input becomes $\mathrm{false}$, the timer stops and the output is reset to zero.

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.