DSC: Connection to the 3rd party OPC Server

I had this work with LabVIEW 2011 and Win XP...  After update I can't make it work...   Now with LabVIEW 2012 and Win 7, the server is now upgraded to Win 7 system.

I'm reading a commercial server OPC of Yokogawa variables.  I can connect to the server.  I can see the variables and create a related shared variable.  But when I access the variable fails.

Dave,

My problem is very basic.  Go to the administrator in the 'control panel' the instructions say.  It does not exist in Windows 7.  I'm stuck.  Here is the complete procedure as given by the very useful Dylan Caswell.

Here are the instructions for Windows 7 (I'll put this on the forum so that others can see or change the KB if it works)

1. press on the Start button and Type: Component Services
2. click on "Component Services" under programs
3. in the left Section of "Component Services" expand: ' Component Services > computers > my computer > DCOM Config.


4. search for the name of your OPC Server (in your case should be in the sense of: "Yokogawa Exaopc Data Access Server")
4A (not sure if this is necessary, but I also repeated for the other server "Yokogawa Exaopc data access server OPC Link1")
5. right click and select properties of your OPC Server

6. click on the identity of the Properties window tab
7. Select "interactive user."
8. click OK, and then restart the computer

This does not solve the problem, so I went to the second stage.

If this does not work, let's try the other method, as described in the KB but for Windows 7:

1. press on the Start button and Type: Services
2. Select 'Services' under programs
3. in the right part of the window, sort by name by clicking on the 'Name' column, and then select: NEITHER engine Variable
4. right click NI Variable engine and go to properties
5. Select the log tab, click this account:
6. Select an account that is an administrator
7. Select OK and restart the computer.

There is a 'right click' option to stop and start the service.  I don't reboot but simply stopped the service, numbered 5 and restarted the service.

Immediately my VI running began to show valid numbers!

Tags: NI Software

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