I've always wondered if there is a difference if you build a PLC project in the Debug or Release configuration. I don't think there is since the .compileinfo file in the _CompileInfo folder is the same size and it has the same filename (some hash I guess). Also when I log in after building with the other configuration, I do not get the prompt if I want to log in with online changes.
Does anyone know if the build configuration has an influence on the compiled code?
Short answer:
No, there is no change to the built code.
Long Answer:
The Build Configuration Tools that are referred to are primarily designed for implementation with general text based languages, rather than the TwinCAT layer that Beckhoff has stacked on top of Visual Studio. Under standard languages there are a lot of properties that can be managed at the project level, and these properties are what are being modified when you change from debug to release configuration.
Twincat projects however are made up of two separate projects (proj_a.tsproj, proj_a.plcproj), and Visual Studio only recognizes one of these as a project file that can be modified, the .tsproj. So if you want to see what properties will be modified by swapping between debug and release, have a look at what properties are available from the .tsproj file.
If you want to test this yourself you can disable a project file (proj_a.tsproj) and swap between debug/release to see the disabled status change as a result of swapping between the two build configurations.
