CSWA Electrical Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

A Programmable Logic Controller (PLC) is primarily designed to manage and control industrial processes and machinery through automation. The main function of a PLC is to read inputs from various sensors, such as temperature sensors, pressure sensors, and switches. After processing this information according to pre-programmed logic, the PLC then sends controlled outputs to devices such as motors, valves, and actuators to manage the operation of the system.

This capability allows PLCs to perform tasks that involve monitoring and controlling, ensuring processes operate efficiently and safely. The flexibility of programming a PLC also means that it can adapt to different application needs, making it central to modern industrial automation. While PLCs can interface with heavy machinery, perform basic calculations, and communicate between networks, their primary role around input/output operations and controlled responses is what truly defines their main functionality.