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I/O Access Error Message??

Created by: kanan at: 11/13/2008 5:26 AM (9 Replies)

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11/13/2008 5:26 AM	Rate (0)
kanan Posts: 133 Rating: (2)	Dear All, I have CPU 416-2-DP connected to the network. I have external error led on all the time and when I looked into Diagnostic Buffer it sais:"I/O access error when transferring the process image to the output module"?? I searched forum for sutable questions but answer not clear for me. Please help. I also attached screen shot. regards Kanan Attachment CPU_error1.jpg (392 Downloads)
kanan Posts: 133 Rating: (2)
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11/13/2008 5:38 AM	Rate (0)
kanan Posts: 133 Rating: (2)	Attachment of invisable side of diagnostic buffer... Attachment CPU_error2.jpg (373 Downloads)
kanan Posts: 133 Rating: (2)
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11/13/2008 7:20 AM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/1/2026 Posts: 12479 Rating: (2722)	Hello kanan; If you go Online in the HWConfig editor, your defectivemodules will be shown with a red bar, you could thenreadily identify the unit that causes your diagnostics. If not, check which unit has a I/O interface starting at address 1550 (PIW or PQW) and a length of 128 bytes. Now, the Diagnostic Buffer message calls for OB85 in order to process that particular problem. So start by creating OB85 in your blocks folder, and download it to the PLC (no programming necessary at this point). Once the SF signal comes back, the Diagnostic buffer will have used OB85's local variables to collect more precise information, which you can save an send back to the forum if needed. Hope this helps, Daniel Chartier

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11/13/2008 7:23 AM	Rate (0)
Wüstenräuber Gold Member Joined: 10/3/2008 Last visit: 10/22/2025 Posts: 996 Rating: (129)	Hi, could it be that you inserted a wrong MLFB for a module (not the real existing module)? Wüstenräuber

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11/13/2008 7:40 AM	Rate (0)
kanan Posts: 133 Rating: (2)	Hello guys! thanks for reply! The thing is no modules(I/O module) shows error, only cpu itself. Also OB85 is present in project. I have looked for adress area -on cpu input and output modules there is no 1550 adress, you can see it in attached picture as well. About MLFB-I did not undestand what is this? I guess can it be from remote I/O station adress? regards
kanan Posts: 133 Rating: (2)
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11/13/2008 7:50 AM	Rate (0)
kanan Posts: 133 Rating: (2)	I found it! it is coming from remote station output adress, you can see it in attachment. Now I khow where it is coming from but how can I fined out which adress exactly? regards Attachment 3.jpg (333 Downloads)
kanan Posts: 133 Rating: (2)
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11/13/2008 8:00 AM	Rate (0)
kanan Posts: 133 Rating: (2)	Please see attachment I think I found problem, lenth for output module 64 but may be should be 128 or back way? regards Attachment 4.jpg (304 Downloads)
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11/13/2008 8:13 AM	Rate (0)
kanan Posts: 133 Rating: (2)	I looked to remote station project as well for this output module-I found the same thing?? may be I was wrong , this parameter ok? problem something else?regards
kanan Posts: 133 Rating: (2)
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11/13/2008 9:53 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 12/24/2025 Posts: 9097 Rating: (1202)	Dear kanan, Are there any led's showing on DP/DP coupler? Is other master also getting problems? Best regards, Wizard

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11/14/2008 2:02 AM	Rate (0)
kanan Posts: 133 Rating: (2)	Hi Wizard, yes I have found problem! I have checked remote station project and there also was external error led on, and fined that one of the station(ABB motor start/stop station) was switch off and this station added to the network! so thats why both plc stations was giving alarm. Thank you very much all of you( especially Dcharter!)..Regards Kanan
kanan Posts: 133 Rating: (2)
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