5/9/2012 12:48 AM | |
Posts: 10 Rating: (0) |
the plc s7 cpu 414 showing external fault and all motors turned off .it happened three times till now. what can i do..? |
5/9/2012 3:00 AM | |
Joined: 9/27/2006 Last visit: 10/13/2024 Posts: 12287 Rating: (2685)
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Hello Amit; When a diagnostic LED lights up, there is a log of events that is kept in the Diagnostic Buffer of the CPU. It is important that you open the Diagnostic Buffer and analyse its contents, it should help you understand what the CPU is complaining about. Open the diagnostic buffer through the Simatic Manager menu: PLC > Diagnostics/Settings > Module Information If the contents are difficult for you to locate the source of the fault, save the contents of the buffer ("As Text") and attach the file to this thread so we may help you decipher the contents,There is a complete chapter on diagnostics using Simatic Manager that youshould read in the following manual: SIMATIC Programming with STEP 7 V5.5 There are diagnostics OBs (organisation blocks, OB82, OB85, OB86, on 121 and OB122, amongst others) that can help the diagnostic buffer collect information in case of various types of error. If you see a message in the diagnostic buffer that states "Missing OB" then look for the OB number in the same message, create an empty version of the OB and download it in the PLC. This will help prevent the CPU going to Stop mode when it encounters the error, and fill up the diagnostic buffer with more specific details on the source of the error. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 5/9/2012 3:08 AM |
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This contribution was helpful to1 thankful Users |
5/10/2012 8:04 PM | |
Posts: 10 Rating: (0) |
we again install the old C.P.U. bt change it if same problems repeat again,till now all is well. thank u very much for ur help and need ur assistance in future again. regards Amit gupta bhushan steel ltd. AttachmentDiagnose.pdf (283 Downloads) |
Last edited by: Amit gupta at: 5/10/2012 8:27 PM |
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5/10/2012 8:07 PM |
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Posts: 10 Rating: (0) |
ya! we r able to see it online ,nw we installed the old one. thanks 4 ur support and need ur help in near future. regards Amit Gupta Bhushan steel Ltd. |
5/16/2012 4:48 PM |
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Posts: 10 Rating: (0) |
To experts, plz tell me about the ideal time of plc/c.p.u. in detail. best regards Amit gupta Bhushan steel ltd.
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