POU (Program Organization Unit)

Functions, function blocks, and programs are POUs which can be supplemented by actions.

Each POU consists of a declaration part and a body. The body is written in one of the IEC programming languages which include IL, ST, SFC, FBD, LD or CFC. CoDeSys supports all IEC standard POUs. If you want to use these POUs in your project, you must include the library standard.lib in your project.

POUs can call up other POUs. However, recursions are not allowed.