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Siemens s7-400 BusF

1/14/2024 3:02 AM	Rate (0)
asympt0tz Joined: 1/14/2024 Last visit: 1/14/2024 Posts: 1 Rating: (0)	Good day sir. Newbie here in Siemens s7-400. We've been having this Bus Fault in s7-400. Sadly we cannot access the plc program since it is locked. Can you help me on what to do? I don't have exact PDF manual to lean to. Thanks Attachment 170520110783870377828441858024.jpg (397 Downloads)

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1/16/2024 12:19 PM	Rate (0)
Raijin Joined: 2/6/2023 Last visit: 11/15/2024 Posts: 124 Rating: (15)	Hi, The problem is in the communication module and not in the PLC. In the CP manual: https://support.industry.siemens.com/cs/us/en/view/59187251 page 30 you can see the meaning of the LEDs. For your case: A duplicate IP address was detected after the CP was in RUN. or • Difference in the transmission medium or the duplex settings between the configuration and the current system Have a good day
	Last edited by: The Helping Hand at: 03/01/2024 09:59:27 Link and text formatting optimized
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2/29/2024 10:23 AM	Rate (0)
wired_bit Regular Member Joined: 4/14/2018 Last visit: 11/16/2024 Posts: 48 Rating: (1)	Have you resolved the issue? BF LED means there is an issue in the network of the CP module, you can try checking from physical connections and cable heath. And there could be other issues like network or subnet address issue. In the CPU diagnostics buffer there will be good information that help you to troubleshoot.
	---wired_bit 🤯
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