statechart transition time

[Jason123]

I'm new to the statechart module.  I have a program working, but I need to add a few features.  My transistions are working good, but I need to build in some "what if" senerios.  My state will transistion if and input comes on, but I need to add an OR statement to prevent if the input fails to come on.  This is where I'm having trouble.  I have tried the elapse time function set to 5 seconds and OR with the input within the same transition.  Therefore, if the input never comes on it will transition anyway after 5 seconds.  The elapse time only works on the first iteration of the statechart, then acts as it is alway ON.   I have set the check box to auto reset after elapse time, but that doesn't seem to help.  I have also tried wiring the auto reset input.  I'm not sure if this is the most efficent way to do what I'm trying to accomplish.  I have found some examples where they use a user created time elaped VI.  Can anyone steer me in the right direction?

[Karunya_R]

Hi Jason,

First let me make sure that I understand your problem correctly:
The transition doesn't happen after 5 secs even if you use autoreset for the elapsed time. The elapsed time stays on after the first iteration meaning that the next time it checks, it sees that the elapsed time is more than 5 secs (even though it's not) and automatically makes the transition.

What you want to do:
Ensure that it checks for the inputs or if the time elapsed is more than 5 secs before it transitions.

One possible solution:
Use a guard inside your statechart to check for elapsed time or for the inputs.

Other solution:
Check for the conditions in the caller VI and just use the statechart for your transitions with null triggers.

There are many different ways to this depending on your statechart and your caller VI is set-up. I prefer the solution of using the guard to move through the transitions.

Few questions:

1. Are you in synchronous or asynchronous mode?
2. Where do you want to check for these conditions?
   
3. Are you using guards right now?
4. Are you sending the current time and inputs to your statechart?

Screenshots of your caller VI and your module will be helpful.

Hope all this information helped!

[Jason123]

I used the feedback node to reset the elapsed time function and everything works good.

[TOBBR]

Could you explain how you used the feedback node on the elapsed time vi?

I'm having pretty much the same problem here....

regards!

[Jason123]

Check out the pdf attachement.  This is the code I used.