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Profibus Slave Error

Created by: Karl84 at: 8/5/2014 1:32 PM (4 Replies)

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8/5/2014 1:32 PM	Rate (0)
Karl84 Advanced Member Joined: 8/28/2012 Last visit: 5/24/2023 Posts: 39 Rating: (0)	Hello, CPU - 1212C firmware 4.0, TiA Portal V13, Comms module - CM1243-5 When I unplug my Profibus cable to simulate a comms failure, the CPU has a flashing error LED but remains in the RUN mode, this is all fine. But when I stick code into the OB error blocks that I felt would to relate to the error I get nothing back (using global variables). My question(s) I guess is: What are the relevant OB's I need to use? Does the OB only get called once or is it called continuously while the fault remains? Is there any other way I can monitor the fault via:Instructions - Extended Instructions - Diagnostics - Device States? Cheers

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8/15/2014 5:30 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (303)	Hello, In my opnion the interrupt OB "rack or station failure" should be called. With the function in annex you should be able to get more info. See attached screenshot. And more info in the system manual, chapter 4.1.3.9 http://support.automation.siemens.com/WW/view/en/91696622 Attachment D:\TEMP\System Manual - Station Failure.JPG (86 Downloads)
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8/15/2014 9:14 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (706)	Hello, What i know about the error OB (300 and 400 systems) is that they are called only when the error comes and goes. I think with the 1200 same thing (maybe some 1200 expert can confirm this) what you need to do is to move your error information from the error OB to the main program, that means load and transfer (move) the data to a DB or M-area. Regards, Marcjan
	Last edited by: Marcjan at: 8/15/2014 9:17 PM Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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8/16/2014 9:40 AM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (303)	Hello, In S7-300/S7-400 the corresponding OB is OB86. Have a look in this manual: http://support.automation.siemens.com/WW/view/en/44240604 Chapter 1.22 for more details.
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8/22/2014 7:08 PM	Rate (0)
Karl84 Advanced Member Joined: 8/28/2012 Last visit: 5/24/2023 Posts: 39 Rating: (0)	Cheers gents very useful information.

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