SIMATIC S7-300 / S7-300F

CPU Problem

Thread Starter: Tevita   Started: 4/13/2012 1:11 AM   Replies: 3

  4/13/2012, 1:11 AM

Tevita Joined 4/4/2012 Last visit: 2/7/2013 Posts: 12 Rating:  (0)	(0)  Dear Expert, Hi, I'm using a CPU 317F-2PN/DP and how to get rid off the BF and SF this two LED remain red when the plant is running.. Thanks
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  4/13/2012, 1:20 AM

dchartier Joined 9/27/2006 Last visit: 6/17/2013 Posts: 4029 Rating:  (622)

(0)  Hello Tevita; Your first reflex should always be to check the contents of the CPU's Diagnostic Buffer whenever the BF (Bus Fault: problem on the network) and the SF (System Fault: internal problem, in the configuration or the programming) appear. AS the CPU continues running, I would presume that the diagnostic OBs (OB83, OB85, OB86..., OB122) are present in your program file, so you should have good information on what the PLC is complaining about. If you have trouble understanding the messages, you can save the contents of the Diagnostic Buffer and upload them to the forum, so we can help decypher it. Hope this helps,, Daniel Chartier

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  4/13/2012, 3:29 AM

Tevita Joined 4/4/2012 Last visit: 2/7/2013 Posts: 12 Rating:  (0)

(0)  Hi, Here are the message from the Diagnostic Buffer.                    Details on Event.         Event ID: 16# 38C4 Distributed I/O: station return. Address of the affected DP slave: station number 81. DP master system IO: 1 Log base address of the DP slave: input adress 8081. Log base address of the DP master: 8191. Requested OB: Rack failure OB(OB 86). Priority class: 23 External error,incoming event Thanks

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  4/13/2012, 3:57 AM

playerslight Joined 4/30/2008 Last visit: 6/17/2013 Posts: 640 Rating:  (37)	(0)  check node 81 on your profibus.check your connections ,end of line termination resistor, power to the node Regards Steve Do yourself a favour Read the manual try the search function then ask
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