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PROFINET Connection Issue - BF-D LED Red on Bus Coupler (AXL F BK PN TPS)

SHNBSHNB
edited December 2024 in PLCnext Technology & PLCnext Controls

Hello,

I’m setting up PROFINET communication between a PLCnext Controller (AXC F 2152) and an AXL F BK PN TPS Bus Coupler, but the BF-D (Bus Failure) LED on the Bus Coupler is red, indicating the connection is not established.

Here’s the current setup:

  • PLCnext Controller: IP Address 192.168.1.40
  • Bus Coupler: IP Address 192.168.1.50

I have configured the PROFINET settings in PLCnext Engineer, where the Bus coupler as PROFINET Device configured. However the PROFINET Controller configuration is still missing. The configuration has been downloaded to the PLCnext PLC, and the Bus Coupler is detected in the FL Network Manager with the correct IP address. However, the BF-D LED remains red, suggesting the connection is still not established.

What could be causing the BF-D LED to stay red despite proper IP assignment and detection in the software? and how the PROFINET Controller can be configured in this case?

Thanks !

Best Regards

Comments

  • Frank Phoenix Contact Deutschland SupportFrank Phoenix Contact Deutschland Support

    Hi SHNB,

    thanks for your support request.

    Well, your configuration sounds correct, but there are some things who might went wrong.

    Very helpful is the Profinet Diagnostic inside the WBM of the PLC:

    Diagnostics - PROFINET

    If the PLC were able to connect to the BK there should be a meaningful message.

    In case there is just "no connection" written than the following points are usually the reason:

    • A Profinet connection is established via the Profinet Name. The device must have the same name like configured inside the PLcnext Engineer Busconfiguration.
    • The IP is assigned from the Profinet Controller according to the project settings, make sure that both IP adress are in the same subnet

    If those points does not resolve the issue please contact the German Technical Support.

    Kontakt | Phoenix Contact

  • SHNBSHNB
    edited December 2024

    Hi Frank,

    thank you for your response and support. The Profinet diagnostic feature in the WBM of the PLC was extremely helpful in identifying connection errors. I managed to resolve the BF-D issue on the BK, and it now appears correctly in the tree.

    However, I’ve encountered another issue: there’s a red indication on the PLC. I suspect this might be related to the Profinet controller configuration in the PLCnext. The BK seems to recognize the Profinet controller, as it is visible in the web diagnostic (Connected Profinet controller 1). Additionally, the IP address of the Profinet controller is within the same subnet as i have changed the subnet again for the other devices (see screenshot)

    Could you help me understand if I might have misconfigured something or clarify why the Profinet controller isn’t functioning as expected?

    Thank you in advance for your assistance.

    image.png


  • Frank Phoenix Contact Deutschland SupportFrank Phoenix Contact Deutschland Support

    Hi SHNB,

    great, that the WBM gave you already some useful information.

    Based on the screenshots it seems that you've also another AXC F 2152 as Profinet Device in your network.

    At the beginning you've stated that you are trying to connect the 2152 as controller with a TPS BK as device.

    So, this might be kind of missunderstanding.

    If you really have another 2152 in you network and you like to use it as Profinet device, it must have the configured Profinet name and must be in the same network, so that the AXC F 2152 (as controller) can find and configure the device.

    But if you only have the BK connected to the 2152 (as controller), you don't have to add the 2152 as device into the network. So, it maybe not even necessary...

  • SHNBSHNB

    Dear Frank,

    Thank you for your support and assistance so far. My objective is to connect the AXC F 2152 Controller to a BK using a Profinet connection to achieve master-slave communication. I’ve been following the steps outlined in the blog on your website (https://www.plcnext.help/te/PLCnext_Engineer/Configuring_Profinet_controller_and_device.htm) to accomplish this setup.

    Initially, I assumed that adding another AXC F 2152 as a device (to be profinet controller) in the configuration would not be necessary, since i dont really have it. However, without adding it, the BK’s web diagnostic consistently shows "0 connected Profinet controllers." This leads me to believe there might be a misconfiguration in my PLCnext configuration. And if i add in the profinet section the actual controller it says that the name and ip address is already used in the project.

    If it helps, I can share the project file for you to review. Unfortunately, I haven’t been able to find any detailed blogs or documentation online that explain this specific configuration in depth.

    Could you please advise if there’s something I might have overlooked or share any additional resources that could guide me?

    Thank you for your time and support.

    Best regards

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