Possible bug in Polymorphic AI Single Scan?

I'm trying to use the AI Single Scan VI to read a set of 3 analog input
channels (2 differential, 1 rse) under LabView 6i, but I'm having some
strange problems. The output is polymorphic, so I select the output type I
want by popping up and going to "Select Type" and picking the output style
I'm looking for.
Here's the problem: I cannot get the Single Scan to reliable return Scaled
& Binary data at the same time! Either "Scaled" or "Binary" mode works, but
when I select "Scaled & Binary" it only returns data in one of the two
arrays--the other is left empty. What's more, the array which contains data
seems to depend on the _last_ way I had the VI configured (i.e. if I do
"Binary" and then "Scaled & Binary"
it returns the binary data but NOT the
scaled, while conversely if I start with "Scaled" and then select "Scaled &
Binary" it's the scaled data that gets returned properly.)
This looks to me like it might be a bug in LabView 6i. I haven't
exhaustively tested it, but what I'm doing isn't exactly complicated, and I
was able to do the same thing back in Labview 5.x.x with no difficulty. Is
there something I'm doing wrong?
Justin Goeres
Indio Systems, Inc.
Pleasanton, CA

Justin,
This sounds like an issue that was reported in NI-DAQ 6.8. It has since been fixed in NI-DAQ 6.9. I would recommend updating your NI-DAQ driver and see if that fixes the problem. You can download NI-DAQ 6.9 from www.ni.com/softlib.nsf/. Hope this helps.
Regards,
Erin

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Hi JL,
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Well, if you would look more closely you would recognize the "Save to Spreadsheet" as polymorphic VI. As this polymorphic VI doesn't support EXT numbers internally (it only supports DBL, I64 and String) LabVIEW chooses the instance with most accuracy: I64 (I64 has 64 bits precision, DBL only 53...). So your options are:
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And yes, those coercion dots always signal some conversions - you should atleast check what's going on there...
Message Edited by GerdW on 05-21-2010 10:01 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
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Hi Joel.
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Attachments:
CntrCntrl_AI_LoopTest.vi ‏100 KB

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I usually solve this issue by this procedure:
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Message Edited by GerdW on 01-28-2010 03:07 PM
Best regards,
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Possible bug in Polymorphic AI Single Scan?