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Programming error OB121- WHY?

Created by: gregory24 at: 2/14/2014 10:34 PM (11 Replies)

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2/14/2014 10:34 PM	Rate (0)
gregory24 Posts: 26 Rating: (0)	Hi guys. I tried to download project to the plc 315-2dp SES7 315-2AF01-0AB0 with success, the cpu is in run mode but the problem is on the plc SF diode goes red and in diagnostic buffer appears programming error with comment "Area error when reading". I noticed that UDT blocks in the project wasn't download to the cpu. Why can't I download it? What's wrong?
gregory24 Posts: 26 Rating: (0)
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2/15/2014 2:34 AM	Rate (0)
Dongerpure Posts: 262 Rating: (21)	Hello Gregory, I think you can first remove OB121 from CPU which makes CPU to go in Stop mode then you can click on diagnostic and find whats is the reason system went to Stop Mode. Then do the necessary changes or you can start blocking individual blocks to trace the fault. Hope it helps.
Dongerpure Posts: 262 Rating: (21)
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2/15/2014 5:23 AM	Rate (0)
playerslight Posts: 1064 Rating: (72)	First of al udt's are not downloaded they are use to create the datablocks that you download to the plc. the error you are getting is thet you are trying to read a value past the end of your datablock .post you diagnostics and then we might be able to help you find out were the error is occuring
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2/15/2014 9:00 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	gregory24 ... "Area error when reading". ...What's wrong? DB is missing or to short. Check diagnostic buffer entrys, give us screenshoot.
IBN-Service Posts: 8946 Rating: (1000)
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2/15/2014 12:25 PM	Rate (0)
gregory24 Posts: 26 Rating: (0)	OK here's screenshot of diagnostic buffer. Attachment 315-2 dp.jpg (2260 Downloads)
gregory24 Posts: 26 Rating: (0)
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2/15/2014 12:50 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	Click on "open block", then you jump to the position where the error occurs. Area ID 0..... It looks like a DB ist missing or not actual... Upload your program to the forum.
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2/15/2014 2:14 PM	Rate (0)
gregory24 Posts: 26 Rating: (0)	Thanks everybody for help The problem resolved! There was lack of some db's and fb's in the source project. I downloaded backup project and everythink looks fine. greetings
gregory24 Posts: 26 Rating: (0)
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This contribution was helpful to 1 thankful Users dchartier

2/15/2014 5:19 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	You are welcome!
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5/4/2016 11:40 AM	Rate (0)
Min_Moderator Posts: 4758 Rating: (122)	New question published by andress is split to a separate thread with the subject FB915 return an error. Best regards Min_Moderator
Min_Moderator Posts: 4758 Rating: (122)
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9/1/2016 10:10 AM	Rate (0)
Min_Moderator Posts: 4758 Rating: (122)	New question published by KirYan is split to a separate thread with the subject Buffer CPU "Area length error when reading" in OB121. Best regards Min_Moderator
Min_Moderator Posts: 4758 Rating: (122)
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