What is PLC? A Beginner’s Guide

A Programmable Logic Controller (PLC) is an industrial computer used to automate machines and processes. It is designed to withstand harsh environments and is widely used in manufacturing, energy, and automation industries.

How Does a PLC Work?

A PLC follows a simple cycle:

1. Input Scan – Reads signals from sensors, switches, or other input devices.
2. Program Execution – Processes logic based on the programmed instructions.
3. Output Scan – Sends signals to control devices like motors, valves, or alarms.
4. Communication – PLCs can connect to SCADA or HMI systems for monitoring and control.

Why Use a PLC?

• Reliable – Built for industrial environments.
• Flexible & Programmable – Can be easily modified for different applications.
• Fast & Efficient – Executes instructions in milliseconds.

PLCs are essential in modern automation, making processes faster, safer, and more efficient.