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On FIFOs & Buffers

what are they exactly?
and, more importantly, how do they affect my programs?

FIFO: when aquiring realtime data i always get a fifo
error. my program stops executing. if i run it a few times...
about 3... the FIFO error goes away and my program works.
??

Buffer Size: if i add a BufferSize control in my program..
and vary the number and size of the buffers, my program
runs the same, but my values (results) seem... i'm not sure..
scaled? at any rate, changing buffersize changes my numbers.
changing number of buffers seems to have no effect on results.

any ideas?
-tony
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Message 1 of 19
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Test us they are?

"FIFO" is a FLA (four letter acronym) for "First In First Out" an acounting term that is commonly applied to a type of buffer.

A buffer is a region between two areas. Buffers in a data acquisition context is a temporary storage location used to hold the data that has been acquired or will be output.

A FIFO buffer is a strorage location where the first piece of information read from the buffer was the first piece of information stored.

Re:Your errors
We could be of greater use if you would,
1) tell us the exact error message you are seeing
and/or
2) post the code you are trying to run.

I am at a loss as to how I can be of any further assistance,

Ben
Retired Senior Automation Systems Architect with Data Science Automation LabVIEW Champion Knight of NI and Prepper LinkedIn Profile YouTube Channel
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fresh off my screen:

"
ERROR 9100 occured at DaqWaitOnRequest.vi
Possible Reasons
DAQDRIVE: FIFO over-run
"

then there is a little button in the error window that
says "OK" ... but everything *isnt* okay. 🙂

how do i post my code? just drag'n'drop the actual VIs?

goal: aquire 1 second of data from a 0-10V accelerometer.
1 second = 100,000 samples @ 100,000 samples/second.

-tony
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Message 3 of 19
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When you reply there is a button at the bottom of the screen that lets you attach files.

Please post your code.

What kind of interface are you using?

Ben
Retired Senior Automation Systems Architect with Data Science Automation LabVIEW Champion Knight of NI and Prepper LinkedIn Profile YouTube Channel
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Message 4 of 19
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我也遇到了同样的问题.
I had met the same question.
 
error 9100 occured at daqwait on request .vi
 
possible reasons: daqdrive: fifo over run

帖子被风定云远在03-12-2007 12:28 AM时编辑过了

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Message 5 of 19
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Hi Tony. 

I have been researching the daqdrive that you mentioned in your last email and it seems that this is a 3rd party driver produced by Omega Engineering in 1996.  Is this an accurate statement?  Also, I started looking for the daqwait on request.vi and was unable to find any information on this VI.  What version of the driver are you using? 

Also, what Data Acquisition Card and what version of LabVIEW are you using? 

Let us know and I will be happy to help you further.  Also, in the interest in getting the rest of the community to work on this, Ben has requested that you attach your code so he can take a look at it.  Can you please do this for him?  It would certainly help in our efforts to find out what is going on. 

Brian F
Applications Engineer
National Instruments

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thank you for your reply.
the daq card is daqp-16 ,pcmcia bus; 16bit,100KS/s,but only can using in 8 chs*4KS/s. the card company is quetech.
the labview version using is 6.1,and the card labview driver is for labview 5.1 version.
you can see the error  picture uploaded .
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Message 7 of 19
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Hello PHD---xjtu,

We can see the front panel of your VI in the screenshot, but we will need to see the block diagram code to determine what might be going on and causing this for you, so please post your VI.

Best regards,
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ok,the diagram picture of the pcmcia card daqp-16 now can be uploaded.
 
please download it and try to explain it,I don't know why  the error  occures.
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Message 9 of 19
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the vi and the support files of the daqp-16 card
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Message 10 of 19
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