What is the role of an input module in a PLC?

The role of an input module in a Programmable Logic Controller (PLC) is to receive and process signals from various sensors and input devices. This module acts as the interface between the physical world—where sensors detect changes such as temperature, pressure, or flow—and the digital environment of the PLC, which can interpret and manipulate that data for control purposes.

When a sensor detects a parameter of interest, it sends a signal to the input module. The input module then processes this signal so that the PLC can understand and react appropriately based on its programming. This processing might involve translating different signal types into a format that can be used by the PLC's central processing unit (CPU) to execute the necessary control logic. The ability to effectively receive and interpret these signals is crucial for the functional operation of an automated system, as it ensures that the PLC has up-to-date information on the current state of the system.

The other choices focus on different functions that are not directly related to the primary role of an input module. For instance, executing control commands is primarily the function of the PLC's CPU, while converting data into a digital format typically occurs during the signal conditioning phase outside of the input module. Managing power distribution pertains to the electrical infrastructure of the system rather