Element resets to zero after sub vi runs

Hi all,
I want to use the following code to slowly and continuously ramp up laser power. The sub vi called scan does the ramping but after it has ramped all the say up to the set power it resets to zero. I have been working for awhile trying to figure out how to the variable element set to the final desired power after the ramping has finished but I can't figure out a way that works. I'm curious if anyone has any suggestions!
Thanks,

Well there's your problem, at least the one causing your drop: your index input will keep going up with each iteration, but your array inside the VI is only so large. Once the index goes above the array size, it tries to index past the end and will therefore output the default value of zero. To fix this, put a Select node that is controlled by your x=y? boolean output. If True, output the "Stop" input value and ignore the indexed value.
DISCLAIMER: This should fix your immediate problem that you're asking about, but your code in general will most likely have other issues. There are better ways to ramp a signal.

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I've answered this question some hour ago but I see it's still unanswered, so something went wrong.
I think you are bumping against a race condition i.e. you read a value of a control or indicator and change it inside the same loop, LV does not accept it.
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Hey guys,
when posting examples, don't retain bad programming, even if it only occurs as a side issue. New LabVIEW users will copy everything posted here as gospel!
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Cruncher loop!
Easy correction: place a smal wait inside that loop!
Message Edited by altenbach on 04-11-2007 05:12 PM
LabVIEW Champion . Do more with less code and in less time .
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Element resets to zero after sub vi runs

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