Why can't this VI become a SubVI?

[noneqwerty]

Hi

This led chaser VI is required to be used multiple times but I cannot make it into a SubVI.

The led switches on to chases to the end & more to create a delay Then returns by switching them off.

It works as a VI but not as aSubVI.

Any ideas?

[altenbach]

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noneqwerty wrote:

It works as a VI but not as aSubVI.

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I guess I have no idea what you mean by that. 😮

• If you want to call it as a subVI and actually see something interesting, you might want to set the windows option to show the front panel when called and close it when done.
• If you want to call it multiple times in parallel, you need to make it reentrant.

What's the purpose of the OK button? Seems pretty useless. 😉

Why is your shift register orange. Make it the right datatype (blue!).

You should initialize the boolean shift regsiter too.

Message Edited by altenbach on 05-29-2009 05:48 PM

[noneqwerty]

Hi

 The led chases to the right & back to the left when the OK button is pressed then stops.

Thats what I mean.

The switch is for simulation. I want to press a switch to trigger the leds.

Because I want to use this 4 times in the project simulation It is best to make it into a subVI. It fails as a subVI.

If I bring it into a new VI it fails to run.

Dont know why it changed to orange. What should I look for?

Cheers

[altenbach]

Well, it seems that you just started to learn programming in LabVIEW, so let's make a few things clear.

• It seems you are using the "continuous run" button th run the VI. This is a debugging tool and no reasonable way to run a VI.
• You button is set to latch action, so as soon as the subVI is called, it will finish. No way to press the button.
• You know from the beginning how many iterations the loop will take, thus a FOR loop is the correct structure
• Your wire is orange because you have a floating point number wired to it. The code demands an integer, so simply change the representation of your diagram constant.