advanced hmi instance error

Greetings,

New to the whole OPC thing so...

I have installed kepserver ex on a computer and wrote a quick test app using advanced HMI that grabs a integer tag from kepserver using OPC and displays it on screen.

If I run the test program on the same computer as the OPC server, it works.

If I run it on a different computer across the network, it says 'object not set to an instance of...' and the program doesn't work.

Also I tried matrikon OPC test and I get similar results. On OPC server machine I can see all tags. Different machine I get a connection failure.

What am I doing wrong? Thanks!

You might be better off asking this on the AdvancedHMI forums.

Archie is pretty responsive on here too

OPC can be quirky.
The number one reason for OPC connectivity problems is the clients computer firewall settings and the computers DCOM settings.

Do a google search on those topics for more info.

Try:
http://www.opcti.com/OPC-FAQ.aspx

perfect! that link solved it. I needed to setup DCOM permissions. Working great now! Thanks!