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Unlock PLC potential with multi-language programming strategies

Jul 30, 2025

Key Highlights

  • Embrace a multi-language approach to PLC programming by combining IEC 61131-3 languages like structured text (ST), ladder diagram (LD), function block diagram (FBD) and sequential function chart (SFC) to optimize for specific tasks, improve readability for maintenance and enhance overall machine complexity and flexibility.
  • Leverage function blocks as a modular and reusable tool to encapsulate specific logic, protect intellectual property and enable scalable, maintainable code across diverse applications.
  • Integrate software development best practices, such as testing, into PLC programming, particularly for text-based languages and library development, to ensure code quality and simplify troubleshooting in complex automation systems.

As machine complexity grows, many engineers are moving beyond a one-language-fits-all approach to PLC programming. The sweet spot seems to be a combination of IEC 61331-3 programming languages to best suit the application and the end user.

Read article on controldesign.com