Case Structures

[BrassBandit]

I have developed a case structure but I want to be able to reset it to its default state instantaneously. Each structure contains a while loop so I must end the loop and then use a select comparison to decide which state to go to. That part works, however it only works if I have a stop button in every while loop. Is there a way to compine multiple stop buttons into just one on the front panel while still existing in multiple states in the block diagram?

[AeroSoul]

I'd use local variable (right click on the button in block diagram -> create -> local variable).

edit:

alternatively you could just have the stop button outside the case structure and wire it's output to all the while loops (i'm assuming there is a larger while loop outside the case structure)

[RavensFan · Accepted solution]

It would help if you attached a VI.  But from what you described, you either have things backwards or more complicated than they should be.

I would not put while loops inside of case structures.  Since you used the term "state", I assume you have a state machine.  The best structure of a state machine is a case structure inside of a while loop.  No additional while loops inside of cases.  If you need to stay in a state, then you have your state machine to decide to go back to the same state or move onto another state.

[BrassBandit]

Unfortunately, I cannot show the VI but I agree that it is more complicated than it should be. I will attempt rebuilding the state machine. The issue i was having with local and global variables is that it would not read the value until the loop that I wanted to stop was conplete.

[Yamaeda]

Help -> Find examples -> State machine fundamentals should give you some good tips. 🙂

[johntrich1971]

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@BrassBandit wrote:

Unfortunately, I cannot show the VI but I agree that it is more complicated than it should be. I will attempt rebuilding the state machine. The issue i was having with local and global variables is that it would not read the value until the loop that I wanted to stop was conplete.

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I agree with RavensFan. Make your state machine the loop and just repeat the state if needed. There is no need for local or global variables.