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Mastering PLC Programming

You're reading from   Mastering PLC Programming The software engineering survival guide to automation programming

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Product type Paperback
Published in Mar 2023
Publisher Packt
ISBN-13 9781804612880
Length 386 pages
Edition 1st Edition
Tools
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Author (1):
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M. T. White M. T. White
Author Profile Icon M. T. White
M. T. White
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Toc

Table of Contents (25) Chapters Close

Preface 1. Part 1 – An Introduction to Advanced PLC Programming
2. Chapter 1: Software Engineering for PLCs FREE CHAPTER 3. Chapter 2: Advanced Structured Text — Programming a PLC in Easy-to-Read English 4. Chapter 3: Debugging — Making Your Code Work 5. Chapter 4: Complex Variable Declaration — Using Variables to Their Fullest 6. Part 2 – Modularity and Objects
7. Chapter 5: Functions — Making Code Modular and Maintainable 8. Chapter 6: Object-Oriented Programming — Reducing, Reusing, and Recycling Code 9. Chapter 7: OOP — The Power of Objects 10. Part 3 – Software Engineering for PLCs
11. Chapter 8: Libraries — Write Once, Use Anywhere 12. Chapter 9: The SDLC — Navigating the SDLC to Create Great Code 13. Chapter 10: Advanced Coding — Using SOLID to Make Solid Code 14. Part 4 – HMIs and Alarms
15. Chapter 11: HMIs — UIs for PLCs 16. Chapter 12: Industrial Controls — User Inputs and Outputs 17. Chapter 13: Layouts — Making HMIs User-Friendly 18. Chapter 14: Alarms — Avoiding Catastrophic Issues with Alarms 19. Part 5 – Final Project and Thoughts
20. Chapter 15: Putting It All Together — The Final Project 21. Chapter 16: Distributed Control Systems, PLCs, and Networking 22. Assessments 23. Index 24. Other Books You May Enjoy

Final project – creating a simulated assembly line

Our final project will consist of a production line. The line will consist of a function block for a facade and another function block that will have the following methods:

  • Turn on the motors
  • Home the motors
  • Start the motors

The first thing that we will want to do is create the mentioned methods with an access specifier of Public and a return type of BOOL. Once that is done, create a GVL called outputs and set the following variables:

{attribute 'qualified_only'}
VAR_GLOBAL
     motorState  : WSTRING;
     startMotors : BOOL;
     MotorsOn    : BOOL;
END_VAR

The HomeMotor method will consist of the following:

outputs.motorState := "motors homed";

The StartMotors method will consist of the following:

outputs.startMotors := TRUE;

Finally, the TurnMotorsOn method will...

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