Should the LabVIEW program be reduced to the speed of data collection?

I'm using a LabVIEW program created by Ocean Optics for a
Spectrophotometer probe with is run through the USB port. The problem
occurs when we attempt to collect data over a time frame of one
second. For some reason the whole LabVIEW program will begin to
operate at the speed of data collection when we try to run the VI with
an integration time of +500 ms. If anyone would be able to offer any
kind of explanation or theory it would be greatly appreciated. Thanks
for any and all help.
Daniel

Dear Daniel,
since LV has no support for USB this must be done through a DLL or Active-X control. A call to a DLL or Active-X method is a synchronous node in LV, that means LV will go on executing when the call completes.
My theory of your problem is that the program makes such a call and it would take that time to collect the data in the DLL or Active-X control. If you have only one loop in the program and do not use dynamic loaded VIs through the VI server than the program seems to hang on each of this calls.
I hope this helps
Waldemar
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
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Here, I'm attached the picture that I snap when the Error occur....
Attachments:
error.JPG ‏222 KB

You have to try to isolate the problem...
Use 'Diagram disable' or 'Case' structure to run special part of code or try write a specific code to access and manage your equipment.
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Hi there,
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This board is for Mathscript, but you seem to have a matlab problem. You should probably post in the LabVIEW forum instead.
What is your LabVIEW version? What is you matlab version?
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Once running the labview program which contain DAQ Assistant and can be run without any error before, the message box of "ERROR-50405....." appear which capture down in the attachment. We use PCI6221 and LabVIEW 8.0 in Windows XP. I also found that the Device Manager of Window have recognized the PCI6221.
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Attachments:
labview error.JPG ‏145 KB

Hi~
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To exit the Labview program

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This is exactly the discussion I was hoping to stimulate. (I
hope interesting, educational and possibly controversial). I think that the
most valuable part of the discussion to date is your experience and issues with
the application of the Exit vi.
I suspect I may be about to commit heresy to many. But in suggesting what
follows, I hope you will keep in mind a British comedy that I like called
'Black Adder' with Rowen Atkinson. I am applying this to many levels in this
response. I admit to brevity again here....
He is struck with a dilemma of forbidden love and cares what the world will
think and goes to the 'Wise Woman' for advise on his problem: -
She gives him three possible solutions: -
Kill yourself - 'No' says he.
Kill the object of desire - 'Not really' says he.
Kill everyone else - 'Not really practicable' says he.
He elects not to take the advice of the 'Wise Woman' - It transpires that there
was a solution, as there was an error - he just didn't have all the
facts..........
To add one small part to the story, I would like to add that everything dies
eventually!
So here it comes.... Everyone SHOULD be putting in at least one EXIT vi in a
production application!
Still sat in your seat?
I propose - For exactly the reason that has been pointed out with regard to the
hardware and safe shut down. That is to allow the software (LabVIEW) to do the same. To
explicitly and formally state when and where the application terminates - Even
if in principle it is not actually intended that it should - the exit point and
software shut down sequence should be clearly indicated. I would suggest there
should be normally one exit point for a classical application.
To this end the example posted would be modified to include the EXIT vi - when
the designer has, resolved all issues or just can't cope any more.
What one tends to see, both in this forum and in released applications; is
development code or applications that were never reviewed to completion. Effectivley Beta applications.
NI don't put the EXIT vi's in Examples; as it, of course, EXIT's LabVIEW
cleanly and completely!!!! (bit of a pain for a novice). But as a result neither do many others.
So are you a convert to the cause?
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Do you allow for and provide, a single point of software shutdown;
clearly stated and explicitly defined for production applications (would you
admit you don't / haven't)?
If you don't; what do you do?
How do you go about trying to assure clean up of any problems (I have
yet to meet the perfect systems designer, I live in hope).

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Hello
I want lock my program in running mode. can you help me to know how it is possible?
when we design a program for a user, maybe a child or ane person change the program or stop it, or change the value like an array. is it possible to lock the progran in running mode?
thank you
Best Regards

behzad1 wrote:
Hello
I want lock my program in running mode. can you help me to know how it is possible?
when we design a program for a user, maybe a child or ane person change the program or stop it, or change the value like an array. is it possible to lock the progran in running mode?
thank you
Best Regards
I have attached a primitive example, it should give you some idea, maybe it helps. Of course i put it together quick, so the style is not nice
The password is a string, visible on the block diagram, so password protect the block diagram via the "VI properties". Also, change the "Window appearance" to custom, where the closing "cross" is disabled ("Allow user to close window"), and you also hide the abort/pause buttons...
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These steps should give a minimal protection against children and evil colleagues
Attachments:
lock_unlock_FP.vi ‏42 KB

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Hi,
I have bulit a large application in labview 2012 that uses a couple of subvis, local and global variables, some uninitialized shift registers (functional global variables) and some c++ and .net dlls as well. When I open my application the memory usage shown at Windows task manager is around 1.4GB. After running the application and enabling all processes used in the application, the memory usage goes up to 1.55GB but when i stop the application, memory is never released/deallocated until i close the application plus exit labview. Can you suggest how to deallocate this memory? and how can i use the request deallocation function for this application? labview help says i have to place it inside a subVI for which i want to deallocate memory. But i have a lot of subVIs used in my application. I tried placing it in the top level VI and called it after stopping all processes but it didn't work... I am also closing references to all of the .net dlls at the end. Any workarounds??
Thanks

sandee wrote:
When I open my application the memory usage shown at Windows task manager is around 1.4GB. After running the application and enabling all processes used in the application, the memory usage goes up to 1.55GB but when i stop the application, memory is never released/deallocated until i close the application plus exit labview.
You already got some good advice. One thing that was not clear was how you are measuring memory. Since the task manager is capable of showing the memory used by LabVIEW alone (you simply need to look elsewhere), and you said that the memory gets released when you exit LabVIEW, you gave the impression that the 1.4GB was the LabVIEW portion.
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sandee wrote:
I have bulit a large application in labview 2012 that uses a couple of subvis, local and global variables, some uninitialized shift registers (functional global variables) and some c++ and .net dlls as well.
We really need to see some code. It is very well posssible that you have a lots of unecessary data copies in memory due to sloppy programming. How big are the data structures? Do you use local variables for big data structures? What does the program actually do?
LabVIEW Champion . Do more with less code and in less time .

Should the LabVIEW program be reduced to the speed of data collection?

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