This is how IEC 61131-3 is structured in automation vendor IDE's. Thanks to decades of brain damage many of the IDE's don't deal with textual source code but pr

This is how IEC 61131-3 is structured in automation vendor IDE's. Thanks to decades of brain damage many of the IDE's don't deal with textual source code but proprietary binary project files and you click to create POU's, progrm organizational units. Want to write a function? You have to click to create it as a POU and work on the code in a new window. In some IDE's the POU is even plit into a local variable window and a code window. Awful. https://en.wikipedia.org/wiki/IEC_61131-3 https://en.wikipedia.org/wiki/IEC_61131-3