delay

[jeff7095]

like that, when the sensor detected the motor will be run. after 5 sec the true constant will off giging the signal and off the motor. issit have any method to solve it? thank you very much .

[RavensFan]

Do you know your while loop will run either exactly once (if the sensor boolean is False) or run forever (if the sneosr boolean is True).  The while loop is controlled by the value of that boolean which is read before the loop starts.  Once the loop starts, that tunnel will have that value constantly reusing it.  Even if you change the sensor boolean, it won't be detected because your code will be stuck in the while loop.

It is a basic data flow probelm.  I would recommend looking at the online LabVIEW tutorials
LabVIEW Introduction Course - Three Hours
LabVIEW Introduction Course - Six Hours

I don't know what "giging" or "issit" mean.

[jeff7095]

Do you have any idea or example can share with me? thank you

[Ray.R]

Not sure what you want to accomplish, but the example below will accomplish what you were trying to do.  Why the Exclusive OR?  Is the TRUE a constant as in your code?  Or is it a boolean variable, where you actually need eclusive OR?

 

Message Edited by Ray.R on 03-12-2010 07:44 AM

[jyang72211]

Hi,

I am still not 100% sure what you want, but I made a few assumption and made the attached state machine for you. 

Yik

[GregFreeman]

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jeff7095 wrote:
i am the new user off Labview. i wanna using delay to control gate of the feeder machine in 3 second. but  when the delay function block i put it the whole system are delayed. have ppl know how to create a delay just a sub part of the program delayed and not affected the whole program. please help me, thank you ^^

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What I believe he is doing (haven't looked at any code) is using a wait to control when stuff happens. The problem is, that delay's your while loop. Even if it is in a parallel loop, if you hit stop and it is waiting it takes x amount of milliseconds to read the quit value has changed.

My prefered method...

 Use a timer wired to a case structure. That way your loop keeps spinning, but when the timer expires (say, for your case every 3 seconds, it will execute the "stuff" in the true case.

Where my code has "data taking interval, you would just wire up a 3.

Message Edited by for(imstuck) on 03-12-2010 01:52 PM

[GregFreeman]

what in gods name are my error terminals doing there?!?!?! Who did that?!

[jyang72211]

I guess the error terminals felt like taking a walk 🙂

[jeff7095]

thank you your guy help me. trouble in FInal year project. Anywere thankyou very much.

[Ray.R]

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for(imstuck) wrote:
what in gods name are my error terminals doing there?!?!?! Who did that?!

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I was going to reply to that post, but since your a nice guy I figured I'd let you get away with it.  😄

should that be called "error abuse"?  LOL!

At least you didn't place Locals in there..

<< you're forgiven >>

😉