UA Wrapper Troubleshooting

In case the communication between a UA client and the UA wrapper is not working properly, the following suggestions can help to solve the problem.

Cannot Browse the OPC Items
  1. Check Desigo CC OPC server DCOM configuration.
  • In particular, use the Microsoft Management Console to verify that the user account is set to This user and User and Password are defined. (check the Identity tab for the [company name].OPC.Server.DA). For more details about DCOM settings, see OPC and DCOM Security.
  1. If the configuration is not properly set, adjust the settings, and restart the OPC UA COM Server Wrapper service.

 

Cannot Reach the UA Wrapper Using the Computer Name

Depending on the network configuration (for example, DNS server), it may happen that the UA wrapper cannot be reached using its computer name, but it can instead be reached using the IP address. Check that the server address is one of the following:

  • opc.tcp://[computer name or IP Address]:48400/UA/ComServerWrapper
  • http://[computer name or IP Address]:48401/UA/ComServerWrapper

 

Firewall Issues

Check that all the UA wrapper-specific communication ports are open. For details, see Firewall Settings in OPC UA Server.

 

Untrusted Certificates

To check that the UA wrapper includes the UA client certificate in its trust list, do the following:

  1. Navigate to C:\Program Files (x86) > [company name] OPCUAWrapper.
  1. Rename the ConfigurationToolComplete_Off to ConfigurationToolComplete.
  1. Navigate to C:\Program Files (x86)\[company name]\OPCUAWrapper.
  1. Right-click the .exe file Opc.Ua.ConfigurationTool.exe, and select Run as Administrator.
  1. In the UA Configuration tool, click the Manage Security tab.
  1. Select the UA Wrapper and click View Trusted Certificates.

Check that the UA client has the UA wrapper certificate in its trust list. To troubleshoot such issues, use the tools provided by the third-party OPC UA client.

Very Slow OPC Server Connection

If an OPC client takes too long in connecting to the Desigo CC OPC server and the process Siemens.Gms.OPCServer.exe consumes too much memory, check that in the OPC UA wrapper configuration the separator character is set properly (.) as indicated in Step 6.c of 4 – Wrap New COM Servers.