Which digital communication protocol is commonly used to connect various PLCs in operational technology networks?

Fieldbus is a digital communication protocol specifically designed for industrial networks that connect various types of field devices, including programmable logic controllers (PLCs), in operational technology (OT) environments. This protocol enables real-time communication between devices and facilitates seamless data exchange in a manner that is robust and suitable for the industrial setting.

Fieldbus protocols support a range of devices and protocols within a single network, allowing for interoperability between different manufacturers and device types. This capability is crucial in manufacturing and process control environments where reliability and deterministic performance are paramount.

While options like Ethernet, Bluetooth, and Wi-Fi are widely used for networking, they are generally more suited for office and consumer applications rather than the specific needs of industrial control systems. Ethernet may be utilized in some industrial environments but typically in conjunction with higher-level protocols such as EtherNet/IP or Profinet, which are more tailored to industrial applications. However, Fieldbus is specifically tailored for the seamless integration and communication necessary in industrial settings, making it the ideal choice for connecting PLCs in operational technology networks.