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PLC

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May 1, 2024 Updated June 22, 2025 18 minute read

Navigating the World of Programmable Logic Controllers (PLCs)

Programmable Logic Controllers, commonly known as PLCs, are the unsung heroes of the modern industrial world. At a fundamental level, a PLC is a ruggedized industrial computer designed to automate and control electromechanical processes in manufacturing plants, assembly lines, and other industrial environments. These specialized computers continuously monitor inputs from sensors and other devices, execute a user-programmed set of instructions, and then control output devices like motors, valves, and alarms. Think of them as the hardworking brains behind the brawn of industrial machinery.

Working with PLCs can be an engaging and exciting endeavor for several reasons. Firstly, it offers the thrill of seeing your logical creations come to life, controlling massive machinery and intricate processes with precision. Secondly, the field is constantly evolving, with PLCs integrating new technologies like the Internet of Things (IoT) and Artificial Intelligence (AI), meaning there's always something new to learn and apply. Finally, PLC skills are in demand across a vast array of industries, offering diverse and resilient career opportunities for those who master this technology.

Introduction to PLCs

Path to PLC

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We've curated seven courses to help you on your path to PLC. Use these to develop your skills, build background knowledge, and put what you learn to practice.
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Reading list

We've selected 23 books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in PLC.
This textbook covers the fundamentals of installing, programming, and troubleshooting PLC-embedded systems used in industrial control applications. It provides a foundation for PLC troubleshooting using software and test instruments and covers discrete and analog I/O. It comprehensive resource for students and professionals.
This comprehensive guide covers all aspects of PLCs, from theory to practice. It is an essential reference for anyone who works with PLCs.
Provides an introduction to Ladder Diagram programming based on the IEC 61131-3 standard. It's suitable for beginners, including those without an electrical background, and offers practical examples based on real-world automation problems. It focuses on the fundamental concepts of ladder logic.
Offers practical, real-world examples of PLC programming problems solved using both Ladder Logic and Structured Text, featuring both Allen-Bradley and Siemens platforms. It's highly useful for gaining hands-on experience and seeing how concepts are applied in industry.
Another comprehensive resource covering the concepts behind PLCs. is often recommended for its clear explanations and inclusion of foundational concepts needed before diving into programming. It serves as a solid reference for students and practitioners.
Similar to its RSLogix 500 counterpart, this book focuses on Allen-Bradley PLCs but for the newer Studio 5000 platform. It's essential for understanding ladder logic programming in a modern Allen-Bradley environment, relevant for current industrial applications.
This introductory guide focuses on building PLC programs using the Structured Text language. It's designed for beginners and covers understanding ST syntax, programming logic, and even integrating contemporary concepts like generative AI in automation. It offers a fresh approach for those interested in text-based programming.
This practical guide focuses specifically on Allen-Bradley PLCs using RSLogix 500 software. It is ideal for those working with or learning on this specific platform. It provides step-by-step guidance for beginners on ladder logic programming within the RSLogix 500 environment.
This textbook provides a comprehensive overview of the theory and implementation of PLCs, covering both hardware and software. It is suitable for both undergraduate and graduate students.
Provides a comprehensive overview of PLCs, covering both the basics and advanced topics. It is an ideal resource for students and practitioners alike.
Delves deeper into PLC programming, exploring advanced concepts such as data handling, PID control, and communication protocols. It is valuable for engineers looking to enhance their expertise in industrial automation with a focus on ladder logic applications. It provides practical knowledge for real-life projects.
An introduction to Structured Text (ST) programming for PLCs, following the IEC 61131-3 standard. is valuable for those looking to learn a text-based programming language beyond ladder logic. It includes numerous code examples and best practices for structuring programs.
Provides practical lessons on programming multiple popular PLC brands, including Allen-Bradley, Siemens, and Mitsubishi, using real-world examples. It's beneficial for gaining exposure to different PLC platforms and common industrial applications.
Provides a practical introduction to PLC programming methods and industrial applications, aiming to be manufacturer-independent. It includes examples and problems utilizing several popular PLCs, focusing on fundamental understanding applicable across different brands.
Given the increasing connectivity of industrial systems, this book is highly relevant for understanding the cybersecurity aspects of PLCs, SCADA, and other control systems. It covers threats, vulnerabilities, and how to develop effective security programs in an industrial context. This addresses a crucial contemporary topic.
Provides a comprehensive overview of the IEC 61131-3 standard, which is used for programming PLCs. It is an essential reference for anyone who works with PLCs.
This practical guide focuses on the programming of PLCs using RSLogix 500 software. It includes numerous examples and exercises, making it ideal for hands-on learning.
Offers broad coverage of industrial automation, including a significant section on programmable controllers, instrumentation, and motion control. It focuses on operation rather than mathematical design and is suitable for a variety of courses. It's a good reference for understanding the broader context of PLC applications.
Focusing on industrial networking, this book provides an introduction to PROFIBUS and PROFINET, key communication protocols in industrial automation. Understanding these protocols is essential for integrating PLCs with other devices and systems, directly relating to the course topics mentioned.
Offers a deep dive into the Modbus protocol, another widely used industrial communication standard. It's highly relevant for understanding how PLCs communicate with various devices and systems, as mentioned in the course descriptions.
This practical guide focuses on the HART protocol, commonly used in process automation for communication with smart field devices. It's valuable for those working with instrumentation and control systems that interface with PLCs.
A classic resource specifically for Siemens S7-300/400 PLCs, focusing on Ladder Diagram (LAD) and Function Block Diagram (FBD) programming. While focused on an older platform, it provides foundational knowledge for working with Siemens PLCs and their programming environments. It valuable reference for understanding the evolution of Siemens systems.
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