If my application does some kind of violation which makes it cast an exception it will trigger my real watchdog which results in a reboot.
Unfortunately the log it seems only shows the boot sequence. Is it possible to see what happen before reboot?

Hi DavidBo,

In general Codesys is used to control equipment and an exception is the worst thing that can happen in your installation.

If you cannot prevent the exception from triggering, you could implement a Try catch statement, with this solution your controller keeps on running and you are able to handle the exception.

__TRY
    //This statement will trigger an exception
    Result := 4/0;
__CATCH(exc)
    //Handle the exception
    HandleException(exc, strExceptionText => strExceptionText); // From the Codesys help file
    //Create a log file
    //--------------------------------------------------------
__ENDTRY

What you also could do is implement implicit checks, these functions cover most of the exceptions (like dividing by zero)
See picture

But in general avoid a complete controller shutdown!