Trying to read some DB that does not exist?!

Could you help with this?

I think that in my case there is some pointer that is trying to read some DB that does not exist, but I'm no expert so I appreciate your help.

dchartier

Hello gokizzz;

The screenshot you are showing only has (some) details on a single fault message, while you have many that show the same type of error.

The messages "Area length error when reading" and "I/O access error, reading" are very often linked. They happen together when you have lost connection with an input, either on the main rack or in a distributed I/O station (Profibus or Profinet). The CPU loses connection ("I/O error, reading"), then your program attempts to read that address and you catch another error ("Area length error when reading"). Since they ares attached to a different diagnostic OB, they appear as different messages, but often you will find that they refer to the same I/O errors.

In the case of the highlighted message, an error is detected in the digital input I/O module which contains addresses I4.0 to I4.7. Locate it through the hardware configuration editor and check it out.

To be able to help you out more clearly, we would appreciate if you could use the Save As.. button that appears on the diagnostic buffer page (you show it in your screenshot) so that you can send all your diagnostic messages to a text file. You can attach the file to a reply on the forum, so we may examine it.

In the meantime, check out your I/O modules on the rack and in the networked stations to see if you have any active diagnostic LEDs to show you which modules are showing errors.

Hope this helps,

Daniel Chartier

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Split from area length error when reading.

 It does not have DB1222, I tried make other dignose and stoped the plc to view the stack, there are the result it gave me.

It almost certain it is something on indirect addressing, but I'm not able to find it and STL is not my strong:

Hello,

pls do some effort and make screenshots with PrtScr and Paint program for save them as jpg file, then zip them and attch zip file, this isn't simply clear readable. You have more errors to different DBs so also screenshot about your prj DB existing need to be included to zip file. If more blocks are exits than you can include to screenshot, make roll and make another. Simply you need also check if DBs existed in diag buffer you have also in your offline prj but also in Online.