In a control system, which component interprets input signals and executes control actions?

• A. Sensor
• B. Manual Operation
• C. Programmable Logic Controller
• D. Power Source

Answer: (C)

The Programmable Logic Controller is the component that interprets input signals and executes control actions. It sits in the control loop between sensors and actuators, reads the signals from sensors, runs the programmed logic to decide what to do, and then sends output signals to actuators to carry out those actions. A sensor only provides data about the environment; manual operation relies on human input; and a power source supplies energy but doesn’t interpret signals or trigger actions.