You're reading from Industrial Automation from Scratch A hands-on guide to using sensors, actuators, PLCs, HMIs, and SCADA to automate industrial processes

Product type Paperback

Published in Jun 2023

Publisher Packt

ISBN-13 9781800569386

Length 492 pages

Edition 1st Edition

Languages

Scratch

Tools

Scratch

Concepts

Industrial Internet of Things

Author (1):

Olushola Akande

View More author details

Table of Contents (21) Chapters

Preface

1. Part 1: Learning the Concepts and Skills Required to Get Started

2. Chapter 1: Introduction to Industrial Automation FREE CHAPTER

3. Chapter 2: Switches and Sensors – Working Principles, Applications, and Wiring

4. Chapter 3: Actuators and Their Applications in Industrial Automation

5. Chapter 4: Overview of AC and DC Motors

6. Chapter 5: Introduction to Variable Frequency Drive (VFD)

7. Chapter 6: Drawing Schematic/Wiring Diagrams Using CAD Software

8. Part 2: Understanding PLC, HMI, and SCADA

9. Chapter 7: Understanding PLC Hardware and Wiring

10. Chapter 8: Understanding PLC Software and Programming with TIA Portal

11. Chapter 9: Deep Dive into PLC Programming with TIA Portal

12. Chapter 10: Understanding Human Machine Interfaces (HMIs)

13. Chapter 11: Exploring Supervisory Control And Data Acquisition (SCADA)

14. Part 3: Process Control, Industrial Network, and Smart Factory

15. Chapter 12: Process Control – Essentials

16. Chapter 13: Industrial Network and Communication Protocols Fundamentals

17. Chapter 14: Exploring Smart Factory (Industry 4.0) with 5G

18. Assessments

19. Index

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Using the counter instruction

This is an instruction that can either count up or down when its input is triggered, and an output is activated when the set value is reached. It can be used to determine the number of times an event has happened in a process. In this section, we will be looking at the common counter instructions, including counting up and counting down.

Count up (CTU)

The count up instruction will count up or increase by 1 each time its input is triggered (0 to 1); for example, when a button is pressed and released or when a sensor is activated. The counter’s output will be energized when the number of times the input is triggered (current value of the counter) is equal to, or greater than, the pre-set value (PV).

In this example, a pilot lamp (PL1) is connected to Q0.0. A PNP proximity sensor (NO) is connected to I0.0 and a normally open push button is connected to I0.1, as shown in the following wiring diagram: