Book Image

Mastering PLC Programming

By : Mason White
Book Image

Mastering PLC Programming

By: Mason White

Overview of this book

Object-oriented programming (OOP) is a new feature of PLC programming that has taken the automation world by storm. This book provides you with the necessary skills to succeed in the modern automation programming environment. The book is designed in a way to take you through advanced topics such as OOP design, SOLID programming, the software development lifecycle (SDLC), library design, HMI development, general software engineering practices, and more. To hone your programming skills, each chapter has a simulated real-world project that’ll enable you to apply the skills you’ve learned. In all, this book not only covers complex PLC programming topics, but it also removes the financial barrier that comes with most books as all examples utilize free software. This means that to follow along, you DO NOT need to purchase any PLC hardware or software. By the end of this PLC book, you will have what it takes to create long-lasting codebases for any modern automation project.
Table of Contents (25 chapters)
1
Part 1 – An Introduction to Advanced PLC Programming
6
Part 2 – Modularity and Objects
10
Part 3 – Software Engineering for PLCs
14
Part 4 – HMIs and Alarms
19
Part 5 – Final Project and Thoughts

Chapter 10: Advanced Coding — Using SOLID to Make Solid Code

  1. Function blocks, methods, functions
  2. Break the module up so it is describable in a complete sentence without the word and.
  3. Principle that states that an object of a part class/function block should be replaceable with objects of a child class/function without affecting the behavior.
  4. Principle that states that a function block should not have to implement an interface it does not use, nor should it depend on a method that it does not use.
  5. See the following:
    • S: Single-responsibility Principle
    • O: Open-closed Principle
    • L: Liskov Substitution Principle
    • I: Interface Segregation Principle
    • D: Dependency inversion Principle