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

Troubleshooting – a practical example

When working with motors, it is sometimes necessary to incrementally stop a motor. Sometimes this is due to the process, while other times it is due to the motor or component. To demonstrate practical troubleshooting, recreate the state machine from Chapter 2 with the following modifications, which are the necessary variables to power the new iteration of the state machine:

PROGRAM PLC_PRG
VAR
     machineState          : INT := 1;
     motorSpeedCutOff      : INT := 10000;
     runTime               : INT := 2;
     setSpeed              : REAL;
     numOfParts     ...