topic Re: Re : Re: Re : Re: Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables in LabVIEW

Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

julesjay — Fri, 21 May 2010 06:20:23 GMT

hi,

I need to develop some executables which will be launched on different computer of a LAN. Some DATA are common. I need to share the data using shared variables.

I usually used LabVIEW so I 'm familiar with shared variables but in this case, the RT target is a part of my project.

I do I need to procceed in my case?

thanks

Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

ErnieH — Fri, 21 May 2010 11:12:27 GMT

I have used shared variables on RT and PC systems. Just be sure to check for errors on the shared variables when you read them. I would get bad reads randomly and had to add some code to ignore that data. After that, it worked well.

Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

julesjay — Tue, 25 May 2010 09:10:41 GMT

Hi,

I've never experienced such problems using shared variables!!

James

Re: Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

ErnieH — Tue, 25 May 2010 13:06:52 GMT

Really easy to use. IO load them on my RT system for reliabilty. Here is a link to a tutoruial. In your case, just mock it up and test it.

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

Re : Re: Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

julesjay — Tue, 25 May 2010 13:54:42 GMT

I'm not using a RT target.

In my case I've got several executable on different computer.

Re: Re : Re: Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

ErnieH — Tue, 25 May 2010 14:37:39 GMT

Just create a network shared variable on one machine. You can read it on the other. You can also use them on the same machine. The share variable has its own server. Will run on Windows, real time, etc. Again, if you are not familiar with them, read the tutorial, create a project to test out how to use them.

Re : Re: Re : Re: Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

julesjay — Tue, 25 May 2010 15:09:25 GMT

Ok but it's not my configuration and I haven't found my answer in the tutorial.

You speak of a case where there is a computer and a RT target under the same LabView project. As I said earlier, I often use labview RT and shared variable between computer and RT target. But I assume here it's different.

My question is : how do you acces to the SVE from 3 computers (without any RT target)?

1. If I create 3 labview projects using the same Shared Variable, do I need to use the same .lvlib on each project?

2. Is it possible?

3. How can I configure where the SVE should be? When I use a RT target, It only depends where I put my Lvlib. But here there is 3 projects.

James

Re: Re : Re: Re : Re: Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

ErnieH — Fri, 28 May 2010 22:10:40 GMT

Use the example finder and search for share variables. There are several that do what you want. You do not need a RT system to use them. You can use them between PC's. Just select one as the server and load the shared variable engine to it. Here is a shot o the example finder.

Re: Re : Re: Re : Re: Re : Re: Communicating Between Multiple LabVIEW Executables on different computer using Shared Variables

ErnieH — Fri, 28 May 2010 22:14:08 GMT