Exception handler return value purpose in _CODESYS 3.5

nixola — Mon, 31 Aug 2026 15:43:24 -0000

Hi,
I was trying to figure out how to correctly handle system exceptions in a CODESYS project, but either the documentation falls short, or I'm unable to find the proper docs.
I know I can register a function as an exception handler via Task Configuration > System Events > Add Event Handler, which will create a function with the correct interface; I am, however, unable to figure out what the returned DWORD is supposed to be, if anything.
Is the interface for the exception handler documented and, if so, where can I find it?

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Exception handler return value purpose in _CODESYS 3.5