How fast can shared variable update?

[tom_z]

Hi,

     According to online documents shared variable engine update at 10ms or forced by flushing command. But  I tested the following two program and can not get the shared variable updated:

      Thanks fo rhelp!

      Tom

[ABCPrograms]

Hi Tom,

What is the reason you're using shared variables?

[tom_z]

Hi,

     I used shared variable to transfer data between RT to host.

     Tom

[viScience]

What is your application?  Why would you need to transfer NSV data from the RT to the PC so quickly?  If you need to capture a exact transcript of your RT waveforms (guaranteed not to drop any data points) then NSV's are not the best solution.  Use Network Streams or roll your own TCPIP transfer vi's.

[tom_z]

Hi,

     I don' use NSV to transfer large amount of data between RT and host. The actual application is as follows:

    

      I also would like to test how fast the NSV update rate and how the flush vi works. I test two programs and did not match the number in the documents.

    Tom

[Jake_G]

Hey Tom,

I just wanted to know what kind of system you were working on.  I.E. What version of LabVIEW you were using, what Operating System, etc....

Jake

[tom_z]

Hi Jake,

    I used LabVIEW 2010 and Windows 7.

   Tom

[Brian_P]

Can you post a link to the documents that you are using to get these numbers?

[tom_z]

http://zone.ni.com/devzone/cda/tut/p/id/4679

[tom_z]

Hi,

    I forgot it has to be both directions. So delay longer than 20ms works.

   Tom