Book Image

Industrial Automation from Scratch

By : Olushola Akande
Book Image

Industrial Automation from Scratch

By: Olushola Akande

Overview of this book

Industrial automation has become a popular solution for various industries looking to reduce manual labor inputs and costs by automating processes. This book helps you discover the abilities necessary for excelling in this field. The book starts with the basics of industrial automation before progressing to the application of switches, sensors, actuators, and motors, and a direct on-line (DOL) starter and its components, such as circuit breakers, contactors, and overload relay. Next, you'll explore VFDs, their parameter settings, and how they can be wired and programmed for induction motor control. As you advance, you'll learn the wiring and programming of major industrial automation tools – PLCs, HMIs, and SCADA. You’ll also get to grips with process control and measurements (temperature, pressure, level, and flow), along with analog signal processing with hands-on experience in connecting a 4–20 mA transmitter to a PLC. The concluding chapters will help you grasp various industrial network protocols such as FOUNDATION Fieldbus, Modbus, PROFIBUS, PROFINET, and HART, as well as emerging trends in manufacturing (Industry 4.0) and its empowering technologies (such as IoT, AI, and robotics). By the end of this book, you’ll have gained a practical understanding of industrial automation concepts for machine automation and control.
Table of Contents (21 chapters)
1
Part 1: Learning the Concepts and Skills Required to Get Started
8
Part 2: Understanding PLC, HMI, and SCADA
14
Part 3: Process Control, Industrial Network, and Smart Factory

Latching and unlatching in PLC programming

Latching is a technique used to keep an output energized or activated even when the input ceases. Latching makes a momentary push button act as a maintained switch i.e. after the push button is pressed, the output it turned on remain energized (ON) even when the button is released.

Unlatching is simply a method or technique used to de-energize a latched output.

Latch and unlatch program using normally open push buttons for both start and stop

Write the simple program in network 3 to see how latching and unlatching works with normally open push button for start and normally open push button for stop:

Figure 9.27 – Latch and unlatch program using normally open push buttons for both start and stop

The PLC wiring for the program is as follows:

Figure 9.28 – Wiring to implement latch & unlatch program with normally open push buttons used for both start and stop

The preceding wiring diagram in shows the start push button (normally...