CODESYS 3.5 is a marvel of modern automation—powerful, flexible, and free to start. However, its depth is precisely what necessitates a thorough reference. The is not a bedtime read; it is a working tool. Keep it open on a second monitor while you program, bookmark the sections you use most (Task Configuration, Library Manager, Visualization), and refer to it every time you encounter an unfamiliar function block.

Do not let the "legacy" status scare you. The machinery doesn't care about version numbers; it cares about reliable code. And that reliable code was written using the manual you now know how to find.

While many users look for a static PDF, CODESYS primarily delivers documentation through dynamic formats to ensure information is always current. 1. CODESYS Online Help