What is the function of a PLC (Programmable Logic Controller)?

A Programmable Logic Controller (PLC) is specifically designed to control industrial equipment and processes through programmed logic. The primary function of a PLC is to monitor input signals from various sensors and devices, execute pre-defined control logic, and then send output signals to actuators, such as motors, valves, and pumps. This capability allows it to automate machinery and manage production processes effectively, enhancing operational efficiency and safety in industrial settings.

PLCs are programmed using languages derived from the standard IEC 61131-3, allowing engineers to create complex control schemes that can respond to real-time data and environmental conditions. Their robustness, flexibility, and ability to operate in harsh industrial environments make them indispensable in manufacturing and process control applications.

In this context, options related to data storage, human resources management, and financial transactions do not align with the core purpose of a PLC. These functions pertain to different areas of business operations and do not reflect the primary role of a PLC in controlling physical processes and equipment.