What is the primary purpose of using I/O modules in ControlLogix systems?

The primary purpose of using I/O modules in ControlLogix systems is to convert signals between field devices and the control system. I/O modules act as the interface that facilitates communication between the physical world of sensors and actuators and the digital realm of control logic. They can handle various signal types, whether analog or digital, and allow the control system to read input signals from field devices (like switches, sensors, or transmitters) and send output signals to control devices (like motors, relays, or valves).

This function is critical because it ensures that the control system accurately receives the necessary information about the process it is controlling and can effectively execute commands to manage that process. This bidirectional data transfer capability ensures that the automation system can operate effectively, maintaining safety, efficiency, and reliability in industrial processes.

While other functions of the ControlLogix system may involve operator interactions, program storage, or diagnostics, the I/O modules specifically focus on signal conversion, making option B the most relevant and accurate answer regarding their primary purpose.