What is a PLC?

A PLC (Programmable Logic Controller) is a purpose-built industrial computer used to automatically control machines, installations and processes. PLCs are rugged, reliable and built to withstand harsh conditions such as dust, vibration and temperature fluctuations — making them ideal for use in factories, production environments and infrastructure.

🧠 What does a PLC do?

A PLC collects information from sensors and field devices, processes that data using a programmed logic, and then drives actuators to control a process. Examples include switching motors on and off, regulating temperatures or controlling valves.

The logic in a PLC is programmed in languages such as ladder diagrams (LD), function block diagrams (FBD) or structured text (ST).

🔄 Working with SCADA and setpoints

The data a PLC collects or generates is often displayed in a SCADA system, where operators can monitor and adjust the process. Through such a system, Setpoints — predefined values such as temperature, pressure or speed — can also be modified, prompting the PLC to retune the process accordingly.

🏭 Example applications

• Controlling a conveyor belt
• Regulating the temperature in an oven
• Driving a packaging machine
• Automating a traffic light system

📌 In summary

A PLC is the beating heart of many industrial automation systems. It processes signals, executes logic and controls processes in Real-time — often working alongside SCADA systems and using adjustable Setpoints.