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1.1 IEC 61131-3 standard

  • The IEC 61131-3 programming language standard is the first international standard to provide a standardized programming language for industrial control systems.

  • The software design concepts and models elaborated in this standard for industrial control systems are adapted to the development direction of software and industrial control systems in today's world. The standard has greatly promoted the development of software design for industrial control systems, and has also had a great impact on the software for fieldbus devices.

  • The software model is shown below:

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