Which protocol is used for communication between ControlLogix controllers and other devices?

The correct choice, EtherNet/IP, is a widely used industrial networking protocol specifically designed to facilitate communication between ControlLogix controllers and a variety of devices such as I/O devices, sensors, and actuators. EtherNet/IP (Ethernet Industrial Protocol) operates over standard Ethernet networks, leveraging the speed and efficiency of Ethernet communication while integrating the Common Industrial Protocol (CIP) for the data interchange.

EtherNet/IP supports real-time and high-speed data transmission, allowing for reliable and scalable automation solutions. Its compatibility with standard Ethernet technology makes it accessible and functional across various industrial environments. Additionally, EtherNet/IP enables seamless integration with other automation systems, facilitating interoperability among devices from different manufacturers, which is critical in modern manufacturing processes.

In contrast, while Modbus, Profibus, and RS-232 are all protocols used in industrial communications, they do not provide the same level of performance or integration capabilities that EtherNet/IP offers. For instance, Modbus, while popular, operates over a simpler layer and does not inherently support the same range of device interoperability as EtherNet/IP. Profibus, although a robust fieldbus system, is less common in the context of ControlLogix systems, which are optimized for Ethernet-based communications. RS-232, primarily