There's more extensive help than the context help. Even from the context help, you can click "detailed help" to get to LabVIEW's help file. Did you look through this material? Here are a few tips:
- for real-time, only use a fixed step solver (RK1-4)
- choose the step size you desire, then select the "1 kHZ" or "1 MHz" clock. Select "Auto Period" and then you don't have to worry about calculating the period.
Step size determines how much time is added to the simulation time every time the diagram executes. Period determines how many ticks of the hardware clock pass between every execution of the sim loop. If you want "real time" which implies that the simulation time passes at the same rate as actual time, then the "Auto Period" option will look at your step size, look at the clock you've selected, and automatically calculate the period required to run at real time.
As stated in the help context, the unit of period depends on the clock you've selected. If you've selected a 1 kHZ clock, there are 1000 clock ticks per second and the unit of period (each clock tick) is 1 ms. If you select the 1 MHZ clock, there are 1,000,000 clock ticks per second so the unit of period is 1 us.
Say you select the 1 kHZ clock and choose a period of 15. This means the simulation loop will execute once every 15 ms of actual time. If you want real-time, you should set the step size to 15 ms. This would cause the simulation time to advance at the same rate as actual time. If you set the step size to 30 ms, the simulation time will run twice as fast as actual time.
I don't know anything about scan period; that is not a simulation parameter. Hope this helps, and good luck.
