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The global parameter modelSettings.dt gives the smallest possible average duration for any explicitly modeled process within a model (e.g., the shortest possible delay time). The time input u (usually a duration) will thus be clipped so that the output y will never be smaller than dt.
In the default setting (strict = true) in the Advanced tab no events will be generated:
if strict then
y = smooth(0, noEvent(if u < modelSettings.dt then modelSettings.dt else u));
else
y = smooth(0, if u < modelSettings.dt then modelSettings.dt else u);
end if;