Problem with multiple loops

Hi all,
I recently wrote my first VI for a soil consolidation test, which reads voltage measurements from an LVDT, keeps a moving average, and records the LVDT measurements versus time an XY graph.  Everything is contained in a while loop with a stop button and works just fine.  However,I'm having some trouble scaling this approach up for multiple LVDT measurements at once.  What I want to do is this:
I have a while loop with a relatively short time delay that reads all channels in my SCC system at once.  My DAQ Express VI is set to acquire 1 data point on demand.  Then I send the dynamic data type wire out of the loop and convert the data for each channel to a different scalar value.
Next, I have another while loop for EACH channel/consolidation test.  I'm doing this because I want each loop to have the potential cycle at a different rate, depending on the soil type I'm testing on that particular LVDT.  For example, on Test 1, I may want to acquire a point every half second, whereas for Test 2 I only want a point every 5 minutes.  I'd assumed the best way to do that would be to have ONE DAQ VI set to acquire all channels at a relatively high frequency (as I mentioned before), and then have each test go "get" the appropriate reading when it needs one.  I don't think I want to use a queue, because I may be skipping quite a few data points in between the ones I actually care about.
This is the approach I'd thought up, but the concept could be completely wrong.  To make a long story short, I want to acquire time elapsed/voltage data for 5-6 different channels at different rates.  I want each channel/test to be contained in a different loop so that I can compute individual moving averages for each one.
My problem is getting the multiple while loops to work with one another.  My 'secondary' loops for the individual channels don't seem to be cycling.  If I put a probe on the data tunnels, I get nothing passing out of the first loop containing the DAQ Express VI.  However, everything within that 'primary' loop works just fine.  If anyone has any suggestions, I'd greatly appreciate it.

Here's what I had in mind (LabVIEW 7.0).
Message Edited by altenbach on 04-26-2006 01:25 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments: ‏53 KB
SampleFewer.png ‏9 KB

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