Transcription of Contents
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1. 2. Contents 1 Introduction ..9. Subject of the Book ..10. The IEC 61131 standard ..12. Goals and benefits of the standard ..12. Manufacturers (PLC hardware and software).. 13. 13. History and components ..14. The OrganisationPLCopen ..16. Committees and fields of Results ..18. Certification .. 18. Exchange format for user 19. 2 Building Blocks of IEC Introduction to the New Standard ..21. Structure of the building blocks ..22. Declaration of 22. Code part of a POU .. 23. Introductory example written in IL ..25. PLC assignment ..27. The Program Organisation Unit (POU) ..30. Elements of a POU ..32. Example ..33. Declaration part ..34. Types of variables in POUs.. 35. Characteristics of the POU interface .. 36. The formal parameters and return values of a 37. External and internal access to POU variables .. 37. Code part ..39. The Function Block ..41. Instances of function What is an instance ?
1 Introduction The rapid advances in performance and miniaturisation in microtechnology are constantly opening up new markets for the programmable logic controller (PLC).
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