Labview is no longer recognizing my physical channels. Corrupt subvi?

For some reason, whether the subvi has become corrupted or who knows, my mx create channel VI is no longer recognizing my physical channels. When I run the vi I get a -200099 error which says there may be no physical channel specified. I have the channels set up correctly in mx and they Vi ran fine previously, but now all the sudden..nothing. If I use the Daq assistant I can get the readings I want, which is strange. Anyone had something like this happen?
Tim

Hello Tim,
I'm not sure what is causing your physical channel to no longer be recognized by that DAQmx VI but there are several things we can try to figure out what is going on and possibly resolve the issue.
1) Have you tried using the "DAQmx Create Virtual Channel.vi" in a different program to see if it can properly recognize the physical channel? The DAQ assistant uses this DAQmx VI in its underlying code so I don't suspect that the DAQmx VI itself has become corrupt.
2) Right-click on the DAQ assistant and select "Convert to task name constant". Close the DAQ assistant wizard (you can make any changes in the wizard that you would like) and you should have a task name constant on your block diagram. Right-click on the task name constant and select "Generate Code >> Configuration". This will create a subVI that shows how the DAQ assitant created the virtual channel for the task. Compare your code the configuration code generated from the task name constant and see if there are any differences.
3) If you do think it is a corrupt subVI, reinstalling the DAQ driver support for LabVIEW should overwrite the subVI with a new copy from the installer.
Hopefully we can narrow down what is causing the problem!
Take care,
E.Lee
Eric
DE For Life!

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Physical Channel.JPG ‏116 KB

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Thank you for your answer!
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Attachments:
Screen 1.PNG ‏87 KB
Screen 2.PNG ‏107 KB
Screen 3.PNG ‏129 KB

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There really isn't a great way to do this. I've attached a zip file with a couple of VIs that might give you a an idea or two about how you might want to go about it. Hope one of these helps!
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Attachments:
Chanel Info.zip ‏23 KB

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DAQmx physical channel constant error

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Solved!
Go to Solution.

Hey Justin,
Thanks for your reply.
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Attachments:
DAQ_inst.txt ‏5 KB

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As always I want to do something absolutely trivial and am running into all sorts of issues
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I think this might be the "trivial" way you're looking for: some string pattern matching and a simple
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DAQmx physical channel error message

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Attachments:
error2.JPG ‏171 KB

The first VI 'Create Virtual Cannel' has an input called physical channel. This needs an input. Right click on the terminal and select Create>Constant. Then you can select the channel (something like Dev1/ai0).
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Physical channel constant and indexing

Hi people,
I need to associate an input channel to a certain output channel. Of course, that led me to the idea of a hash table and as Labview doesn;t have such a structure defined, I thought of using a case structure.
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Hi Mike,
Thank you very much for the solution. Yes, this is the right way.
I'd come up with another complication.
What if the name of the channel is not available-can I first extract it from the index of the individual signal that I extracted from the complex one?
I made some comments in the picture , it's part of my actual application. Could I have your opinion on that? I placed an icon if the DAQmx channel propery - is this an answer to the question I posed? I cannot link some things in my reasoning, maybe you can help.
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Attachments:
channel name.JPG ‏153 KB

Labview is no longer recognizing my physical channels. Corrupt subvi?

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