Unable to locate variable

[cirrusio]

Hello all,

I am attempting to put together an application in which a single host retrieves data from 1+ RT-system(s).  I am using shared variables to communicate across the network.  Because the system may have more than one data acquisition system sending data, I would like to host the SVE on the host computer (running Windows 7).  However, I have been unable to get the library to deploy properly when it is located on the Windows PC - I get error -1950679035, "Unable to locate variable in Shared Variable Engine.  Deployment of this Variable may have failed" when I attempt to read one of the SVs.  The communication works seamlessly when the SVE is located on one of the targets, but I want to get away from this as there is the possibility that the machine hosting the SVE is not present if it is on one of the DAQ devices.  I know that I am probably missing something basic (duh), but does anyone have any thoughts?  I have attached the project (it is very simple).

Cheers, Matt

[elset191]

Sounds similar to something I encountered a while back.  You may have to programatically deploy whatever library the shared variables are in. 

I used "localhost" as the IP

[cirrusio]

Thanks Tim.  Unfortunately I get the same error.

[cirrusio]

Oops.  Just realized that this is LV 2010.  If you are interested in running it and need a different version, let me know.  Here is what my VI looked like after implementing Tim's suggestion.:

[elset191]

Is this an executable, or a plain ol' VI?  What I'm getting at is, are you sure the path is right?  (I assume the invoke node would throw an error if it wasn't, but I don't know)

The only other advice I can offer up is to make sure all variables are deployed on every system. 

If that's not the problem, there's not much more I can offer up.  I have pretty limited experience with networking and shared variables.

[cirrusio]

Haha...obviously mine is fairly limited also.  So, here is the story: my starting point is quite simple and illustrates my problem clearly.  Pretend that there is not two devices that I am attempting to communicate, but simply (for right now), two VIs in a single project on the same machine for which I am using SVs to communicate between.  Pretty basic right?  This is what is throwing the error.  I can move the SVE to another machine (a cRIO chassis) and all is fine.  The trouble all starts (regardless of config) when I attempt to place the SVE on the Windows machine.  I suspect this might be some kind of firewall issue, but it is unclear to me what might be going on.  Anyway, thanks for the help.

Matt

[elset191]

Turn off the firewall for a minute while you test it.  If that's the problem, turn the firewall back on and find where you put in the exceptions and allow the other computer access.

[cirrusio]

Well, it seems that I have no problem doing this on another computer (although that one is running 2009 rather than 2010) so I suspect this is related to the firewall; however, I am unable to turn off the firewall on this particular computer due to group policy issues (that would be a big no no with our security guys).  I will just have to choose a SVE judiciously I guess.