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Fieldbus is a digital industrial network system designed for real-time distributed control. It replaces traditional point-to-point wiring with a single bus topology, enabling devices like sensors, actuators, and controllers to communicate efficiently. Key features include reduced installation costs, improved diagnostics, and interoperability between equipment from different manufacturers. Common protocols include PROFIBUS, Foundation Fieldbus, and DeviceNet, widely used in process automation, manufacturing, and building management systems.