I am reading FMI 1.0 model exchange documentation.

I read that when and state event happens between two integration time steps[ti-1, ti], the event indicators change sign. and then fmiEventUpdate should be called.

I do not know by calling fmiEventUpdate:

1- does FMU calculate exact time of the event internally and iteratively? why it needs this time?
2- i guess it calculates this exact time, say, t_event, and then integrate internally in the time period: [ti-1,t_event]. then it changes the equations to the new set of equations and integrate within the period: [t_event,ti]. is it right?

Thanks,
Arvin