This book offers a structured and practical approach to modern PLC development using
object-oriented principles. It is a guide for engineers programmers and students seeking to
harness the power of object-oriented programming (OOP) in the context of industrial automation
with PLCs. The content focuses on the CODESYS development environment and Structured Text (ST)
both of which support modern programming techniques while maintaining compatibility with
real-time automation requirements. Through step-by-step demos and instructional examples it
demonstrates how modular reusable code can enhance development efficiency simplify ongoing
maintenance and enable scalable and flexible control system architectures. Key topics include:
Structured Text fundamentals: conditions loops arrays and functions Object-oriented
concepts: classes methods and inheritance Advanced techniques: polymorphism interfaces and
access control Modular design with reusable components and structured program flow
Implementation of finite state machines and scalable application design Built around
instructional demos and clear explanations this book helps readers develop maintainable and
modern control software in the CODESYS environment using proven programming techniques.
