How to do state machine using events .

[Bob_Schor · Accepted solution]

I'm attaching a small Event State Machine I built to illustrate User Events and using them as a State Machine.  Notice that, in this particular machine, no State takes a lot of time, which means that Events (either Front Panel or State Transitions) get handled quickly.  It does have a single loop, with Shift Registers allowing data to be passed between the "State Machine" and the "Event Structure" simply because they are the same wires in both.

Let us know if this is the kind of architechture you are seeking.

Bob Schor

[mikeporter]

What does "I need a function which calls all the event function like state machine" mean? That is awful close gibberish. Likewise I also don't see the point of your code. You click a button in one loop that fires an event in a second loop, which fires an event in a third loop with very little delay between any of these operations.

Describe how you see it working. And please use simple words. As you can tell I am a simple man who gets confused easily.

Mike...

[SaranVenkateshS]

Hi Mike ,

nice comment 🙂  gibberish

is there any way we can do state machine like State Chart . 

http://www.ni.com/labview/statechart/

or else like this video 

C# can do this job , why labview not able to do these kind of state machines 

https://www.youtube.com/watch?v=GTogQTHR2d8&authuser=0

or else 

UML based State machine 

[SaranVenkateshS]

Hi Mike ,

Please let me know , if you still cant understand this gibbrish means 🙂

[crossrulz]

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saran1988 wrote:

is there any way we can do state machine like State Chart . 

http://www.ni.com/labview/statechart/

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Didn't you just answer your own question there?  The State Chart module is an add on to LabVIEW.

[mikeporter]

The state chart module is in essence an alternative editor. You can't just draw loops and expect them to operate as a state machine. Likewise, events are for signalling.

I have written applications where I have used events to alter the execution of a state machine that was running, but you don't need separate events for each state transition.

See here:
http://www.notatamelion.com/2015/02/23/building-a-proper-labview-state-machine-design-pattern-pt-1/

And here:
http://www.notatamelion.com/2015/03/02/building-a-proper-labview-state-machine-design-pattern-pt-2/

Also be very careful about trying to apply too much of what you learned in other languages to LabVIEW. Basic concepts are fine because a good idea is a good idea regardless of the language in which it is expressed. Specific techniques, however, often do not translate well.

Mike...