6/20/2011 10:52 AM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365) |
Hi Check the following points and the attachment. By improper cabling ,you may loose part of your network when a slave fails.(It is possible)
Attachmentimg515.zip (1027 Downloads) |
6/20/2011 11:21 AM | |
Joined: 10/7/2005 Last visit: 10/3/2024 Posts: 3023 Rating: (1054)
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Activating a terminating resistor on a Profibus Plug will disconnect the outgoing cable and lead to a loss of theDP Slaves downstream of it. You can expect that the DP Master (the PLC) will "complain" about this and it does tell you so in no uncertain terms in your Diagnostic buffer (in your case, some or all of the asscoiated I/O's that are lost were part of theProcess image). Just like Ammy, I'm also not too sure why you have to "fiddle" with the terminating resistors, but if you really must, you may the link below helpful: Which organization blocks do you have to load into the CPU to ensure that the CPU does not go into the "STOP" status when a remote I/O fails? |
Cheers |
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6/20/2011 12:17 PM | |
Posts: 66 Rating: (1) |
I AM HAVING THREE INDEPENDENT SECTION CONNECTED ON THE SAME N/W AND IF I WANT TO DO SOME MAINTENANCE JOB IN LAST SECTION THAN WE TERMINATE THE N/W AFTER SECOND SECTION AND DO MAINT JOB ON THIRD SECTION. THE PROBLEM ARISE ONBOTH TIME WHEN WE TERMINATE THE RESISTOR OR WHEN WE OFF THE RESISTOR. IF THERE IS A PROBLEM IN CABLING THAN KINDLY INFORM ME ABOUT THE PROCEDURE TO CHECK THE CABLE. |
6/20/2011 12:38 PM | |
Joined: 3/21/2006 Last visit: 10/1/2024 Posts: 10229 Rating: (1181)
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Hello, It'sa very strange procedure. 1. Follow fritz's suggestion for "error OBs". 2. Set the TR on right possition according to the topology of Profibus network. (no BF leds ON). Instructions for the permanent termination of a bus segment 3. Disabling DP slaves after startup of the CPU(in order to do the maintanance job there). Best regards, Hristo Mihalev |
6/20/2011 1:02 PM | |
Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715) |
That's the proper methode to use indeed. AttachmentFC3.pdf (997 Downloads) |
Last edited by: Marcjan at: 6/20/2011 1:03 PMProblem solved? |
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