1/30/2020 7:51 AM | |
Joined: 6/22/2016 Last visit: 3/17/2022 Posts: 21 Rating: (0) |
Hi Experts, i want to ask you that it is compulsory, OB 81,82,83,84 and 85 download in PLC. 1) whenever i use cpu 315-2dp with out these OB's its work independently but when i connect Micro master 420 via profibus-DP and define node address is different from plc address, cpu comes in stop mode with SF fault. it is occur due to cpu not found these OB'S or any other reason?? kindly response as soon as possible. ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 01/30/2020 12:12:20New subject after splitting |
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1/30/2020 12:51 PM | |
Joined: 9/27/2006 Last visit: 9/24/2024 Posts: 12282 Rating: (2685)
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Hello babblu arrja; Have a look at this document on diagnostic OBs: https://support.industry.siemens.com/cs/ww/en/view/19350076 Basically, when certain events are detected by the CPU's operating system (which would normally put the CPU in STOP), if the correct diagnostic OB is located in the program, the CPU will not go to STOP mode, the diagnostic LEDs will be activated while the PLC continues running, and the diagnostic buffer will log messages related to the detected fault. In your case, you should open the diagnostic buffer of the PLC to find out what events are disturbing the CPU. Note that you have a SF LED, which refers to an interval system fault, due to configuration, addressing or programming. Look for messages linked to such events. We can help you with the contents of your dianostic buffer if you use the "Save As" button on the buffer page; this generates a text file that you can attach to a forum entry. Hope this helps, |
Last edited by: dchartier at: 01/30/2020 13:27:56 |
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