Codesys 3.5 Manual -

A CODESYS project is not just a collection of code files; it is a structured hierarchy of logic, hardware configuration, and data.

Every CODESYS 3.5 Service Pack (SP) changes small behaviors. If a function block is acting weird, the manual might be for SP15, but you are on SP19. The release notes tell you what changed. Download the release notes for your exact version from the same download page as the software. codesys 3.5 manual

Do you have a "stump the manual" moment with CODESYS 3.5? Drop it in the comments—let's see if the documentation actually has the answer. A CODESYS project is not just a collection