Error 200279 and slow program running

I read a lot of posts about this error but still cannot fix mine. During the execution of the program realizing measures of error 200279 turns suddenly upward. In addition, the program is very slow; I'm trying to read data from a QD and a PSD (two different position detectors) and when I move a detector (QD or PSD, it doesn't bother me) the program response is too slow. I tried to correct the error by setting the value for timeout - 1, but the error is still there. What can I do?

Thanks in advance,

Mercurial

P.D.: Error 200279: tried to read samples that are no longer available. The requested sample was already available, but has since been replaced. Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

You need to understand why your VI is so slow.  It go fast then slow down over time?

I see a lot of things that could cause slowdowns.

1. a lot of Express VI.  VI Express is designed to facilitate the installation and quickly start code.  They are not known for efficiency.  FIX: Use the regular functions of LabVIEW such as DAQmx and file write.

2. you write to a file within the loop.  File writing is usually slower than other functions.  Maybe your hard drive slows you down.  FIX: Use producer/consumer and transfer the file to write to another loop indepdendent.

3. you build graphics XY in the loop.  Inside that express the VI, it is continually adding more data in the tables stored in the shift registers.  These berries grow, windows must track more contiguous memory to store the data.  Eventually, it would run out of memory.  What size are these graphs?  FIX: Sometimes delete these graphics.  (EDIT: I see that you have the "erase data on every setting turned on for that call.)  This may not be a problem.)

4. you write to the nodes property of each iteration of the loop.  Changing the properties of controls can be quite slow at times.  FIX: Write to a property node where the properties really change.  True to the visibility properties Plot writing is really bad, because you do each iteration, that it never changes.  You may as well just outside the loop.

Your code to see how long each iteration of the loop is actually taken from reference.  Turn the pieces to see if you can speed it up.

Tags: NI Software

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