{"id":2802,"date":"2019-03-25T17:41:17","date_gmt":"2019-03-25T20:41:17","guid":{"rendered":"http:\/\/xexeu.elipse.com.br\/pt\/kb39425-opc-communication-not-working-even-after-dcom-has-been-set-up\/"},"modified":"2019-09-19T09:35:14","modified_gmt":"2019-09-19T12:35:14","slug":"kb39425-opc-communication-not-working-even-after-dcom-has-been-set-up","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/kb39425-opc-communication-not-working-even-after-dcom-has-been-set-up\/","title":{"rendered":"KB-39425: OPC communication not working, even after DCOM has been set up."},"content":{"rendered":"
\n
\n

Question:<\/span><\/p>\n

Why is OPC communication working properly in E3Studio, but not when being executed (even after DCOM has been set up)?<\/p>\n

Solution:<\/span><\/p>\n

This happens because the OPC Server cannot be executed in all accounts (it can’t be executed in SYSTEM<\/span>, for example). To fix this, you must follow these procedures:<\/p>\n

1. Access Windows’s DCOM configuration window via dcomcnfg <\/span>command on Run <\/span>(Fig. 1):<\/p>\n<\/div>\n

 <\/p>\n

\"\"
\nFigure 1<\/span> – Run<\/span><\/div>\n

 <\/p>\n

2. After the window has been opened, go to Component Services-Computers-My Computer<\/span>, and open DCOM Config<\/span> folder (Fig. 2):<\/div>\n

 <\/p>\n

\"\"
\nFigure 2<\/span> – Component Services (DCOM)<\/span><\/div>\n

 <\/p>\n

3. Inside this folder, locate OPC Server<\/span> (Fig. 3):<\/div>\n

 <\/p>\n

\"\"
\nFigure 3<\/span> – Servidor OPC <\/span><\/div>\n

 <\/p>\n

\n

NOTE<\/span>: This example uses Elipse SCADA, but you can use any other kind of server.<\/p>\n

4. Once the server has been located, right-click the icon and access Properties<\/span>.<\/p>\n

5. A window with the server’s properties will open. Click Identity <\/span>tab (Fig. 4):<\/p>\n<\/div>\n

 <\/p>\n

\"\"<\/span>
\nFigure 4<\/span> – OPCServer’s Properties<\/span><\/div>\n

 <\/p>\n

6. On Identity <\/span>tab, check the option This user<\/span>, and add Administrator user and their password, or any other user accessing E3Studio. Next, restart the computer.<\/div>\n

 <\/p>\n

\"\"
\nFigure 5<\/span> – User settings <\/span><\/div>\n

 <\/p>\n

Please notice that: from Elipse E3 version 4.7<\/b> on, you will be able to determine the account where E3 OPC Client will be executed. This is now possible because each OPC client runs in an independent process called ‘E3OpcClient.exe’.NOTE<\/span>: Before performing the settings described in this article, you must set up both the Firewall and DCOM as shown in the related articles below.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Question: Why is OPC communication working properly in E3Studio, but not when being executed (even after DCOM has been set up)? 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