Fieldbus protocols are communication standards used in industrial automation to connect various devices, such as sensors, actuators, and controllers. They enable real-time data exchange and control over a single network, improving efficiency and reducing wiring complexity. Common examples include Profibus, Modbus, and CAN bus. These protocols facilitate interoperability among devices from different manufacturers, allowing for seamless integration in a distributed control system. By standardizing communication, Fieldbus protocols enhance system reliability and simplify maintenance, making them essential for modern industrial applications.