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CPU315-2 PN/DP

Created by: 39mike at: 4/26/2011 6:48 PM (3 Replies)

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4/26/2011 6:48 PM	Rate (0)
39mike Posts: 2 Rating: (0)	One of our plc's stops with the "SF" red led lit. This happens at strange intervals and can take many "stop/start" operations before the system starts to run again. This stoppage seems to occur randomly and even when none of the conveyors and equipmenton the systemare running. absolutely no idea where to start looking.
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4/26/2011 7:48 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/14/2024 Posts: 12282 Rating: (2683)	Hello Mike; The standard recommendation in a case like yours is to open the PLC's dignostic buffer and find out what the CPU does not tolerate. See the chapter on diagnostics in the Programming with Step 7 manual (section 7.5): http://support.automation.siemens.com/WW/view/en/45531551 The buffer holds all the newest events that happened during operations of the PLC, not only errors, but stops and starts also, with a timestamp. So you will have to locate the entries that show "STOP caused by..." Also search for "missing ornot loadedOB: OB number xxx", these are diagnostic OBs that the CPU requires in your program in order to process the information from the error, and also keep the CPU running in case of error (in certain cases...). You simply have to create them (in the Blocks folder, New...OB...with the appropriate number), then download it to the ùCPU as is, without programming anything (fror starters). If you have difficulty in locating the sopurce of errors on the PLC, save the contents of the diagnostic buffer and post it here on the forum. We hhave helped many newbies to decipher the contents and find solutions to theirSF problems. Hope this helps, Daniel Chartier

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4/26/2011 8:04 PM	Rate (0)
39mike Posts: 2 Rating: (0)	Thanks for the help and particularly for the link to the manual. Is there a central place to download manuals as they no longer appear available in hard copy? I will read through the manual you linked to and try to move forwards. In other threads I have seen that they say to have OB's 80+ loaded to help. I have a feeling that we don't have them.Yet.
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4/26/2011 8:39 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/14/2024 Posts: 12282 Rating: (2683)	Hello Mike; This forum is the best place to start looking for manuals on Siemens automation platform. Try this: go to the Search box on the right of this page, type S7-315-2 PN/DP (as an example). In theProductSupportpage you will be brought to, you will be pointing at the Forum section (because that is where you are coming from). There you will see many threads by members asking for specific information on their problems. You will also have access to a Manual section, a FAQ section... try them and see what you can find there. Manuals will not be specific to your CPU, but will cover al;l S7-300 CPUs, Step 7 programming software and accessories. FAQs will gve you all kinds of information on setting up special modules, software updates... On that same Product Support page notice the blue box named Product Links. There, grouped by part number, you will find the different elements that correspond to your search word in Siemens catalogue. Click on any one to have access to information specific to your CPU. Hope this helps, Daniel Charier

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