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HL_40851021-Visitor
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June 5, 2025
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Interpreting OPC Diagnostic Log

  • June 5, 2025
  • 1 reply
  • 415 views

Hello

 

We are using KEPServerEX 6.17.240.

 

We are trying to diagnose an issue with frequent disconnects between a Siemens PLC and KEPWare, communicating over OPCUA. We are looking at the OPC Diagnostic log from View -> OPC Diagnostic and I am looking for any documentation for how to interpret these events. 

 

HL_4085102_0-1749116296614.png

 

For example, we are continually getting these "ServerFaultResponses" (which are timeouts associated with a previous "PublishRequest". But there's really no documentation I can find to help interpret these. Some of the other logs have an actual program name in the brackets, where as this example has a seemingly random number. Is there a way to associate this number with a process? Is this number generated somehow by KEPWare or something like a ClientID from the actual OPC Client application?

I'm basically looking for extra information about what some information in these logs mean, specifically for helping to interpret why we are flooded with timeouts and these ServerFaultResponses.

Best answer by rajskumar

Hello,

Here are a few helpful resources that may assist in interpreting the OPC Diagnostic logs and troubleshooting the disconnects:

  1. KEPServerEX Manual – OPC UA Services Section
    Refer to the OPC UA Services section in the manual available at the following link:
     KEPServerEX Manual

  2. Common OPC Error Codes
    This page provides a list of common OPC error codes and their meanings:
    https://www.opcti.com/common-error-codes.aspx

  3. Wireshark Capture
    Performing a Wireshark capture can also be beneficial in identifying communication issues.

Please let me know if you need help navigating any of these resources or locating specific documentation. Thanks

 

1 reply

R
rajskumar16-PearlAnswer
16-Pearl
June 11, 2025

Hello,

Here are a few helpful resources that may assist in interpreting the OPC Diagnostic logs and troubleshooting the disconnects:

  1. KEPServerEX Manual – OPC UA Services Section
    Refer to the OPC UA Services section in the manual available at the following link:
     KEPServerEX Manual

  2. Common OPC Error Codes
    This page provides a list of common OPC error codes and their meanings:
    https://www.opcti.com/common-error-codes.aspx

  3. Wireshark Capture
    Performing a Wireshark capture can also be beneficial in identifying communication issues.

Please let me know if you need help navigating any of these resources or locating specific documentation. Thanks

 

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