What is the primary function of an I/O module in a PLC system?

The primary function of an I/O module in a PLC system is to interface with sensors and actuators. These modules serve as the connection point between the PLC and the external environment, allowing for the input of data from various sensors (such as temperature, pressure, or proximity sensors) and the output of signals to actuators (like motors, valves, or relays). This interaction is crucial in automation systems, as it enables real-time monitoring and control of physical processes.

By converting the signals from sensors into a format that the PLC can understand, and vice versa for the actuators, I/O modules facilitate the necessary communication between the PLC’s processing unit and the devices that execute control commands. This foundational role is essential for any automated system, allowing the PLC to receive input about the current state of a system and send output commands to influence that state.