Communication between CompactRIO and host PC

[damos]

Hello! 

I developped an application using a cRIO (9074) where there are PID's and VISA communications. Data is transmitted to the host PC programm, through shared variables, where there are some menu buttons and I monitor different variables.

I have different behaviours depending where I execute my VI's:

- First, I develop all VI's under "My Computer" and all works fine.

- As everything is working properly, I put the deterministic VI's under "NI-cRIO9074". Here, when I run the two VI's (the main of the host PC and the main of the cRIO), all the deployment are correct, the cRIO program seems to run fine but the values of the host PC update very slowly.

- If, finally, I create the Real-Time Application and EXE application, it seems that there isn't connection between host and cRIO (see attached picture: pressure is a shared variable).

Apparently, Labview doesn't show any error.

Can somebody help me? What happen?

[Kev_R]

Hey Damos,

Here's a useful link about Shared variables, also I recommend having a look in the example finder, and searching RT Network Communication.

Useful link:
Shared Variables
http://www.ni.com/white-paper/4679/en

If you have any further question, relating to this please get back to me