What is one of the two most popular communication protocols used with PLCs?

Ethernet is one of the two most popular communication protocols used with Programmable Logic Controllers (PLCs) due to its ability to support high-speed data transfer and connect a wide range of devices over a network. The flexibility and scalability of Ethernet protocols allow PLCs to integrate seamlessly into larger automated systems, facilitating real-time communication among multiple devices, such as sensors, actuators, and other controllers. Additionally, Ethernet has the advantage of being widely understood and supported across various industries, enabling easier implementation and maintenance.

This protocol leverages existing networking infrastructure, allowing for robust communication over both local and wide-area networks, which is essential for modern industrial automation. The use of Ethernet facilitates not only device interconnectivity but also enhances capabilities like remote monitoring and control, making it an ideal choice for contemporary manufacturing and process control environments.