Which of the following is a type of Fieldbus standard?

Foundation Field Bus is a type of Fieldbus standard that is specifically designed for industrial automation and control systems. It facilitates the communication between field devices and control systems by allowing devices to share information and perform control functions over a single digital communication network. This standard is important because it replaces traditional analog signaling with a digital network, providing enhanced control, diagnostic capabilities, and improved interoperability among devices from different manufacturers.

The integration of Foundation Field Bus into automation systems allows for the implementation of intelligent devices and advanced process control, leading to increased efficiency and reliability in industrial operations. It emphasizes a two-way communication method, enabling not only data collection but also configuration and control tasks, which are crucial in modern industrial environments.

Other options like USART (Universal Synchronous/Asynchronous Receiver/Transmitter) and MQTT (Message Queuing Telemetry Transport) serve different purposes in communication protocols and are not designated as Fieldbus standards. Modbus, while widely used for industrial communication, is categorized as a serial communication protocol and typically does not fulfill the same role as Fieldbus standards in the context of field device integration and control system communication.