Single Step Simulation (EventController)
To process the next simulation event in line, to stop the simulation afterwards, and to thus proceed through your model step-by-step, click 
.
When you hold down Shift while clicking Step , Plant Simulation opens the Method Debugger for all methods and formulas, which are executed while the event is being processed. This means that the debugger opens for all executed controls, formulas and for suspended methods, which were woken up.
If init methods have not been called yet, the init methods are started instead of processing an event.
Instead, you can also click 
on the Home Ribbon Tab.
SimTalk: