global variable doesn't work (connecting two VIs)

[jwan887]

Hi there,

My project is about to use sbRIO 9636 to generate a series of pulses whose periods change in a sinusoid way.

I created a sine wave generator in the main.vi and want to transfer the digital sine wave to the FPGA vi within a global variable (as in figure 1). However, when I run both of the VIs, although a right digital waveform is generated in the main.vi (as shown in figure 2), there's no signal generated in the global variable in the FPGA vi (figure 3). 

Can anyone tell me what's the problem? 

PS: I'm new to LabVIEW and sbRIO:)

Thanks,

Jacky

figure 1:

figure 2:

figure 3:

[M.J]

Hi Jwan887,

You won’t be able to use your global variable with your FPGA.

Please look at the below documentation for help on developing data acquisition applications with FPGA.

http://www.ni.com/white-paper/4534/en/

https://decibel.ni.com/content/docs/DOC-9893