How to pass IMAQ session to subVI
Hi,
My experience with LabView is neither very good nor extensive. I am a scientist and I am acquiring data with IMAQ.My current problem is that the people who wrote the script in the beginning made it neither versatile, nor modular nor clear structured. So I am trying to reduce the ridiculous numbers of execution controls in a single flowchart to a level that people can actually understand it... and to make the script more versatile for future experiments.
I am introducing quite a few subVIs to be executed repetitively. However, I can't find out how to pass the IMAQ session on to the subVI. I always get error messages. In this case I want to acquire frames with OIDE_CollectFrame.vi controlled by OIDE_TrialPhaseCollect.vi. I couldn't figure out how to assign the IMAQ session refnum class, either.
It's probably a newbie question but I usually don't program with LabView.
Dennis
P.S. I use LabView 2009
Solved!
Go to Solution.
Attachments:
OIDE_CollectFrame.vi 19 KB
OIDE_TrialPhaseCollect.vi 15 KB
Hi,
See the attached example. It passes the IMAQ session created in the main VI on to the subVI and then passses it again from the SubVI to the main VI.
Regards,
Greg H.
Applications Engineer
National Instruments
Attachments:
Snap.vi 14 KB
Snap_Main.vi 38 KB
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Message was edited by:
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How to turn off/on triggering within same IMAQ session
I put together an image acquisition application with a NI 1427 frame grabber and a Basler Aviator camera. I want to be able to switch between continuous (non-triggered) acquisition and triggered (acquisition is not running during the switch).
I can switch from continuous to triggered without reconfiguring the IMAQ session by using the IMAQ Configure Trigger3 VI. However, to go back to non-triggered mode, I tried calling the Configure Trigger3 VI with "Disabled" as the Action but that gave me a "Requested triggering mode is invalid error". I also tried using "Software Trigger" as the Type and that gave me the same error. Is there no way to turn off triggering without reconfiguring the entire IMAQ session?
Thank you for any input.
VadimHi Kira,
Thank you for the response. I tried what you suggested but received an error stating that this was not a valid attribute. So I looked in MAX and saw that I have 2 Camera attributes (I think based on my icd file) and they are Bit Depth and Triggering. The Triggering attribute does have a "Free Run" value which I tried using with the IMAQ Set Attribute VI (with Camera Attribute = Triggering). I had no error but the frame grabber was also not acquiring images, i.e., the IMAQ session was originally in triggered mode and it seems that it was still waiting for an external trigger.
Vadim -
Passing control reference to subVI crashes labview
Hi,
using a image control (as indicator) provided by imaq Vision, I tried to pass the reference of the control to a subVI. On a computer it works and on a other (same labview version, same vision version, same os, same hardware and hardware drivers!), this crashes labview. I tried to close the control refnum at the end of the subVI, but that changed nothing to the issue. Now I use the reference as a global variable and it seems to work...nevertheless, I would like to understand what the issue and if I should remove any passing to subVI of control ref because this can potentially triggers an error. My correlated question is if this global passing is a "fake" workaround or have real chance of improving (this before going through the whole code for changing all passing of reference to subVI)
thanks a lotHi,
thank CoastalMaineBird for your answer
How do you know it's this issue which causes the crash?
When I remove this parameter from and the only property node in the subVi that write to it, I have no longer any problem. Moreover, to ensure that's really the "passing", and made a global variable containing the reference to this control and use my original SubVi that do access the control through its reference number
, and it works! In this last exemple, the only change is the way of transmitting the reference
What LabVIEW version?
8.0.1
up to date according Measurement & Automation update tool
Given that one computer works OK, and another crashes, I would say that
you are seeing the effect of something else, not the cause. If passing
a control ref via terminals was fatal, it would be fatal all the time.
You have some other sort of issue, perhaps timing of the different
machines triggers the bug, perhaps running out of memory, perhaps
LabVIEW is corrupted on one machine.... But I don't think changing all
your code to use globals would solve the real problem. Actually, saying that I wonder about problem of synchronisation. I know from Visual C++ that this kind of error happens if two process try to access the same control at the same time. This is typically an error changing from a computer to an other, and mutex or semaphore are the way to deal nicely with that. But does labview contains already such a securisation? If so, the global variable point on a single object and can "fell" the semaphore/mutex. But passing make a copy that will likely have two different semaphore/mutex but will point to a single control! Do someone know if I'm wrong in this idea or not?
Thanks
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