Fieldbus is a communication system used in industrial automation to connect various devices, such as sensors and actuators, to a central control system. It allows for real-time data exchange and control, enabling efficient monitoring and management of processes. By using a digital signal instead of traditional analog methods, Fieldbus improves reliability and reduces wiring complexity. There are several types of Fieldbus protocols, including Profibus, Modbus, and CANopen. Each protocol has its own specifications and applications, catering to different industrial needs. Overall, Fieldbus enhances interoperability among devices, streamlining operations in manufacturing and process control environments.