Issue
The IEC 61131-3 not only describes the PLC programming languages themselves, but also offers comprehensive concepts and guidelines for creating PLC projects.
Defined in IEC 61131 standard, a Program Organization Unit (POU) provides a modular and hierarchical way of structuring programs that makes it easier to develop, debug, and maintain industrial control programs. How will this concept be used to organize and structure industrial control programs?
Resolution
In this document the term POU is used for programming elements in general that can contain IEC code, such as methods, properties, interfaces etc. The term Program Organization Unit (POU) is used for all programming objects (programs, function blocks, functions, etc.) which are used to create a controller application.
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