A Distributed Fieldbus I/O System is a networked setup in industrial automation that distributes input and output (I/O) modules across a facility. Unlike traditional centralized systems, this architecture uses fieldbus communication to connect remote I/O modules to a central control system. It offers scalability, flexibility, and reduced wiring, leading to cost savings and simplified installation. This system enhances reliability by minimizing single points of failure and can be tailored to diverse industrial environments and applications.