5 Fieldbuses

5.1 What Is a Fieldbus?

Fieldbus is a digital two-way multidrop communication link between intelligent field devices. It is a local area network dedicated to industrial automation. It replaces centralized control networks with distributed control networks and links the isolated field devices such as smart sensors/transducers/actuators/controllers. Foundation Fieldbus H1 and PROFIBUS-PA are the two fieldbus technologies used in process control.

In this two-way communication, it is possible to read data from the smart sensor and also write data into it. The multidrop communication facility in fieldbus results in enormous cable savings and resultant cost reduction. A fieldbus device must have a fieldbus interface unit for proper communication ...

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