Anugrah Sajan (Customer) asked a question.

April 22, 2026 at 3:21 PM
Unable to connect C2-OPCUA intelligent module's server to UA Expert Simulation Client software.

I have the current configuration:

System ConfiguraionThese are my Slot 0 setup settings:

Slot 0 SettingsimgimageimageimageThese are my UA Expert settings:

imageThis is my PLC's Date and Time settings, which are in the range of the certificate:

imageThis is my small ladder logic program that I write to ensure the PLC is running:

imageEvery time I attempt to connect my PLC's OPC UA server with the UA Expert Client software, I get the following error "Server Node ClickPlusOPCUA Could not connect to Server: Bad Timeout.

 

I can successfully ping the module

I am connected to the C2-OPCUA module through a network switch and ethernet cable.

The PLC is being programmed via micro-usb.

There is 24V DC supply for the PLC.

I am on the latest firmware of the software and PLC.

 

Why can I not connect to the OPC UA server through the UA Expert Client software?

I can connect other simulation server software (Prosys) to UA Expert. The C2-OPCUA module is flashing the green OK LED. So, what am I doing wrong here?

  • 10 answers
  • 202 views

  • ADC_Click_PE01 (AutomationDirect)

    When online with the CLICK software is there any PLC Error for Slot0? Also what is the status of SC301, SC302, and SC315. Also SD308. These are status bits and registers for the Slot 0 Module. If no errors are shown you could try to force update the FW for the C2-OPCUA by unchecking the Skip updating modules with the same version button. Please See CL014 and CL340 for these steps.

    Selected as Best

  • ADC_Tech_03 (AutomationDirect)

    Disable (uncheck) the allow list then and try connection again after reloading the project into the PLC.

    image

  • ADC_Click_PE01 (AutomationDirect)

    According to your Security tab screenshot you did not add a user certificate. If you either disable security for testing or add a Cert you should be able to connect. Please see Help Topic CL330. Hope this helps

  • Anugrah Sajan (Customer)

    Tried it with the Cert and by just disabling all the security. Neither worked. I ended up switching the IP to a different subnet and I am able to ping the server but can not connect even on this subnet. No error codes or anything. It is almost as if, the server is not properly initializing. What are the chances this is a faulty module? At this point I have been on multiple calls with tech support and no one there is able to resolve this and I have messed with every known setting in the module 😅

    • ADC_Click_PE01 (AutomationDirect)

      It does not sound like a faulty module. Try to use the steps in the App Guide page 32. This is absolute minimum needed to get a C2-OPCUA setup with no extras.

      • ADC_Click_PE01 (AutomationDirect)

        When online with the CLICK software is there any PLC Error for Slot0? Also what is the status of SC301, SC302, and SC315. Also SD308. These are status bits and registers for the Slot 0 Module. If no errors are shown you could try to force update the FW for the C2-OPCUA by unchecking the Skip updating modules with the same version button. Please See CL014 and CL340 for these steps.

        Expand Post
        Selected as Best

  • Anugrah Sajan (Customer)

    image 

    Sorry, I was away from this for a bit on another project.

    But these are what I see in those registers.

    Nothing here indicates an error and it seems like the Ready Flag is ON.

    Expand Post

  • ADC_Click_PE01 (AutomationDirect)

    If you have done all of the above I would contact Tech Support to discuss an Return. You should be able to refer them to this Community Post to show it has been worked by a Tech Team member and the Product Engineer.

  • Anugrah Sajan (Customer)

    So we came back to this after a while.

    We flashed the firmware again and ensured that the PLC time was synced to the PC time.

    It works!

    We had to ensure that the bit for Daylight Savings Time was turned ON.

    Otherwise, the hour register kept displaying a value that was 1 hour behind.

    The OK LED was now remaining turned on instead of flashing and we are able to connect to UA Expert with no issues. 😀

    Thank you all for your patience and help!

    Expand Post

 

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