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PLC BUFFER DIAGNOSTIC

Created by: dstudio at: 7/25/2011 4:39 PM (3 Replies)

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7/25/2011 4:39 PM	Rate (0)
dstudio Bronze Member Joined: 8/24/2006 Last visit: 5/31/2024 Posts: 148 Rating: (9)	Hi, I have this fault: I can not stop the plc, but I need to understand where is the problem in the program: fb/fc/n° network. Can you help me???? Event 10 of 10: Event ID 16# 2522 Area length error when reading Global DB, bit access, Access address: 65525 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 04:01:07.393 PM 07/25/2011

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7/25/2011 5:28 PM	Rate (0)
yy1 Gold Member Joined: 3/24/2009 Last visit: 7/9/2024 Posts: 535 Rating: (112)	Dear dstudio, well, you try to read from a db-adress, which does not exist. To find out where this access occurs without stopping the CPU is not simple. I guess, that you have an indirect access to the DB and the adress is negative. If the problem is reproduceable, I'd suggest to load the program in a PLCSIM, delete the OB121 and have a look at the call-stack to see, where the error occurs. Hope this helps! Best regards, yy1

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7/26/2011 7:42 AM	Rate (0)
dstudio Bronze Member Joined: 8/24/2006 Last visit: 5/31/2024 Posts: 148 Rating: (9)	OK thank you very much!

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8/5/2011 9:09 AM	Rate (1)
yy1 Gold Member Joined: 3/24/2009 Last visit: 7/9/2024 Posts: 535 Rating: (112)	Dear dstudio, if the error doesn't occur in PLCSIM, you can try to read the parameters OB121_BLK_TYPE, OB121_BLK_NUM and OB121_PRG_ADDR from the OB121-interface. There you should find the block and the offset, where the error occured. Best reagrds, yy1

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