Using a timer to ramp up voltage in code?

I'm currently using a small VI for the Xandrex XPD power supplies, and I have to automate this program so that the voltage will ramp up, say .2 volts every 500 milliseconds to a user defined voltage (say 15Volts). While I know some basic loops can do this, I am somewhat green with LabView and any help that could be given would be much appreciated. Right now my VI can set current limits and voltages on the PSU. With that out of the way I believe there shouldn't be much more needed in the VI to create a ramp time.
I have attached a picture of my block diagram, if there is anything else that's needed I'll post it up. Thanks!
Attachments:
Block diagram1.jpg ‏49 KB

Here's the VI in 8.0 form. One thing to be aware of is that the time between steps will not be exactly 500msec because Windows is not a realtime (deterministic) operating system. Most of the time it will be very close, but if something happens that severely loads the CPU it is possible for the value to increase significantly.
Mike...
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Attachments:
ramp up.vi ‏11 KB

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The attached showes the array, first row is time (ms) and the second row is voltage (volts).
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David
Attachments:
TimeVoltage.png ‏11 KB

David,
if you have only Base version of LabVIEW, this will be a time consuming task.
If you have either Full or Professional, you will find interpolation-functions in the mathematic palette.
I am not sure which ones serves you best, but i'd startexperimenting with Interpolate 2D.
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[Edit]: You could also use a polynominal fit on your voltage values. You will get a function describing the voltage over time. But you will have to modify this function to take care of the variation of time spacing. If you have a function describing your voltage over your (nonconstant) timestamps, you can simply create values for constant timeslices for your voltage.
Message Edited by Norbert B on 11-06-2008 10:21 AM
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Kind Regards
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The diagram was supposed to look more like this......
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Sorry!
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Using asynchronous timer for data flow control

Hi all,
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Best Regards,
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Using a timer to ramp up voltage in code?

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