9/26/2020 12:05 PM | |
Joined: 9/27/2006 Last visit: 8/16/2024 Posts: 12277 Rating:
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Hello Daniel; S7-300 CPUs use 2 diagnostic LEDs to show the user that something is wrong: - BF means "bus fault", and indicates a problem communicating to a node in Profibus or Profinet. The faulty node will also activate it's own BF LED to help identify it. This could be a cabling/connector problem, a missing termination on the bus (a Profibus problem) or a faulty module on a remote I/O node. - an active SF shows a "system fault", which is more complex to decipher, could be an unreachable I/O address, a programming issue, or any number of problems. But often when it appears along with a BF LED, it means that your program is trying to access (read or write) a node that is no longer available, due to the node being declared faulty. If you have access to Step 7, I suggest you go online and open your CPU's diagnostic buffer, where all events that matter to the CPU are logged, including the appearance of dianostic problems. On the diagnostic buffer page there is a button named Save As.., clicking on it saves all the logged messages to a text file, with all available information on possible causes of the problems. The following link applies to Step 7 v5.x, but the diagnostic information is similar for TIAPortal. Ch. 23 is important for diagnostic tools available for S7-300 CPUs. https://support.industry.siemens.com/cs/us/en/view/45531107 You can attach the text file to this thread so we can examine it with you, and help you find out what the CPU is complaining about. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 09/26/2020 12:15:47Last edited by: dchartier at: 09/26/2020 12:16:37 |
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2 thankful Users |
9/27/2020 6:35 AM | |
Posts: 4 Rating:
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Hello Daniel, Thanks for coming back to me on this issue. Attached here are screenshots of the Diagnostic Faults. Hopefully this gives you more information on the issue we are facing. Here are some of the actions we have done already. 1. Installed the new ET 200M IM 153-1 Address: 30 (both in hardware config/device) Terminator Res… OFF Fault still there Found DI Module; MI1.0501+SK1-K031 Most DI signals not ON
Fault still there 3. Replace new profibus connectors. Fault still there 4. All other Profibus Slaves; the DP couplers/VLTs/etc are On 5. Download again new PLC prog backup but still same problem Daniel AttachmentDiagnose.txt (632 Downloads) |
Last edited by: Daniel.Alo at: 09/27/2020 06:39:33Last edited by: Daniel.Alo at: 09/27/2020 06:43:50Last edited by: Daniel.Alo at: 09/27/2020 10:12:26 |
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2/17/2024 8:29 PM | |
Joined: 8/16/2023 Last visit: 2/18/2024 Posts: 4 Rating:
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Hello, End of the story? Serhiy |
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