Windows Server 2003

This section describes how to configure the OPC Client on Windows Server 2003.

1. Choose Start | Run. Type dcomcnfg and click OK.

2. The Component Services dialog will appear.

2. In the tree pane, locate and select Computers under Component Services.
3. Right-click My Computer in the pane on the right, and choose Properties from the context menu.
4. Select the COM Security tab, and click Edit Limits in the Access Permissions section.
5. Use the Access Permission dialog to select Anonymous Logon, and then check Allow for the Remote Access option.

6. This is needed for OPCEnum.exe to function correctly, and for any OPC Servers and clients that set their DCOM authentication level to None in order to allow anonymous connections. If you don't use OPCEnum.exe, you might not need to enable remote access for anonymous users.

6. Click Apply to save your changes.

7. You need to then edit the launch and activation permissions.

7. Select Edit Limits in the Launch and Activation Permissions section of the Default COM Security tab.

8. In the Group or user names list, select Everyone then select every the check boxe in the Allow column.

8. Click OK to save your changes.

9. Finally, you're ready to edit the default permissions for Access and Launch for each user (or group) that participates in OPC communication (for example, "OPC Users").

9. In the Access Permissions section of the COM Security tab, click Edit Default. Select the necessary users/groups and allow Local Access and Remote Access. Click OK to save your changes.
10. In the Launch and Activation Permissions section of the COM Security tab, click Edit Default. Select the necessary users/groups and allow Local Access and Remote Access. Click OK to save your changes.

11. You have now configured your OPC Client.

    Some older OPC Clients cannot locate CitectSCADA OPC Server on a client machine. If this is the case, copy the ctopc.reg file located in the bin directory to the client machine. Double-click the file to add OPC Server-specific data to the registry.

    Note: Now you need to restart this machine so that your settings can take effect.