What Is a Programmable Logic Controller?

Have you ever wondered how robots in factories know what to do? Or how machines can perform complex tasks with the push of a button?

Enter the world of programmable logic controllers (PLCs)! If you're interested in robotics, understanding how machines communicate and operate is important! Universal Technical Institute (UTI) offers Robotics & Automation programs that can help you gain the foundational skills and knowledge needed to pursue a career in the field!¹ It offers a Programmable Logic Controllers course where students learn how to use programming in manufacturing, automation and other practical applications.

Keep reading and this guide will introduce you to PLCs, their function and how they make a difference in various industries!

What Is a Programmable Logic Controller?

At its core, a PLC is a rugged digital computer specifically designed for industrial applications. Unlike standard computers, PLCs are built to withstand harsh environments, including extreme temperatures, humidity and electrical interference. They play a huge role in automating various processes, from manufacturing operations to complex machinery.

Picture this—a PLC is like the brain of a robot or a machine, managing all the actions without human intervention. It monitors input devices, makes decisions based on pre-programmed conditions and controls output devices.

Basics of programmable logic controllers

PLCs were originally developed to replace relay-based control systems. They are designed to handle real-time tasks and are more reliable than older systems. PLCs use a series of input and output devices to control machinery and processes. Inputs can come from various sources, such as sensors that detect pressure, temperature or motion. Outputs can control actuators, motors or any device that needs to be switched on or off.

The beauty of PLCs lies in their ability to consistently execute pre-programmed logic sequences, making them essential tools in modern automation.

What does a programmable logic controller do?

Now that you know what a programmable logic controller is, let's talk about what it does. A PLC can carry out programmed instructions to perform tasks such as turning on lights, control motors or even run an entire assembly line. That's its primary function. It collects data from various sensors, processes this information and responds according to the logic you’ve programmed.

For example, think about a conveyor belt in a factory. The PLC receives signals from sensors—like "Is there something on the belt?" or "Is the belt moving properly?" Based on this input, it decides whether to keep the belt running, stop it or trigger other connected machinery. This capability allows for precise control over industrial equipment, ensuring that operations run smoothly and efficiently.

How Are PLCs used in Industrial Automation?

In the world of industrial automation, PLCs are used to automate repetitive tasks, which helps reduce errors and improve worker safety.

Imagine a car manufacturing plant. Hundreds of robots and machines work together to assemble parts, paint surfaces and test the finished product. PLCs coordinate these operations, ensuring everything runs smoothly.

PLCs can also communicate with other devices and systems. This means they can share data and receive commands from a central computer, allowing for a smoother production process. This network of communication enhances flexibility, enabling manufacturers to respond quickly to changes in production needs or market demands.

What Industries Use PLCs and Why?

PLCs are used in various industries! Here are some industries that rely on programmable logic controllers.

Manufacturing

The manufacturing sector is one of the largest users of PLCs. From automotive assembly lines to food processing plants, PLCs help a wide range of operations. They optimize production efficiency, reduce downtime and ensure quality control.

Food and Beverage

In the food and beverage industry, maintaining hygiene and quality is paramount. PLCs monitor processes like pasteurization, mixing and packaging. They ensure the right temperatures and conditions are met, helping companies follow safety regulations.

Energy and utilities

Power plants and utility companies use PLCs to manage complex processes like electrical generation and distribution. They monitor equipment performance and ensure that energy is delivered efficiently.

Oil and gas

In the oil and gas industry, PLCs control drilling rigs, refineries and pipeline operations. They monitor pressure, flow rates and other critical parameters to help ensure the safety and efficiency of operations.

Water treatment

PLCs are also used in water treatment facilities. They track water quality, control chemical dosing and manage distribution systems. Their ability to process data from various sensors ensures that water meets safety standards before reaching consumers.

What Skills Are Needed To Work with PLCs?

Now that you see how important PLCs are, you might be wondering what skills you need to work with them. Here are some essential skills for aspiring PLC technicians:

• Technical skills: Understanding the fundamentals of electronics and programming is crucial. You’ll need to know how to read and interpret electrical schematics and develop logic diagrams along with gaining a familiarity with programming languages commonly used in PLCs.
• Problem-solving skills: In the world of automation, things don’t always go as planned. That’s where your problem-solving skills come into play! You’ll need to troubleshoot issues, identify malfunctions and implement solutions.
• Communication skills: You’ll likely work as part of a team with engineers, technicians and operators. Being able to communicate effectively is essential for collaboration and ensuring everyone is on the same page.
• Programming knowledge: PLC programming involves using specific languages, such as Ladder Logic, Structured Text or Function Block Diagram. Familiarity with these programming languages is crucial for creating and modifying control logic.

What Are the Benefits of Taking a PLC Course

If all this sounds like a path you’d like to explore, taking a PLC course might be the next step for you! Here are a few reasons why enrolling in a PLC course can be a game-changer:

• Hands-on training: UTI's PLC course offers hands-on training, allowing you to work on automation systems. Students train under experienced instructors who can help them gain the confidence to tackle real-world challenges.
• Networking opportunities: Taking a PLC course can also open doors to networking opportunities. You’ll meet industry professionals, instructors and fellow students who share your interests. Building a strong network can help lead to internships, job offers and mentorship.
• Career advancement opportunities: Employers want to hire skilled professionals. That is true for any field. Getting PLC training can open doors to various career opportunities. Some positions include automation technician, control engineer and maintenance technician.⁷⁷

Learn How To Use PLCs with UTI

Feeling ready to explore the world of PLCs? Consider enrolling in a program at UTI!

UTI’s Robotics & Automation programs offer a comprehensive curriculum that covers everything from basic concepts to advanced programming techniques. Here are some of the robotics courses:

• Manufacturing Systems and Technology
• Practical Math and Applied Physics
• Industrial Robotics
• Industrial Networking
• Foundation Programming
• Computer Aided Design
• Programmable Logic Controllers
• DC Electrical Theory
• AC Electrical Theory
• Instrumentation and Control

UTI also has state-of-the-industry labs equipped with the technology and software used in the field. Ready to start your path into the world of PLCs? Request more info or fill out an application today!