After procedural and structured programming came object oriented programming. It’s perhaps best to think of OOP as a design philosophy. With procedural languages there was no connection ...

For PLC programming ... defines four programming languages, one of which is Ladder Diagram, drawn from the ladder logic that U.S. engineers are already familiar with. The others are Instruction List, ...

Users are advised to get on board with object-oriented programming sooner rather than later ... Concepts such as class, inheritance, instantiation or polymorphy are obviously scaring PLC system ...