(image courtesy of Yokogawa)
Devices on a Fieldbus network support a wide range of architectures, for both safe and hazardous area applications. Instruments in a manufacturing plant are connected to the network in a variety of topologies including, star, ring, daisy-chain, tree and branch networks. Analogous to how a computer LAN works, a Fieldbus network allows a controller to communicate individually with hundreds of analog and digital sensing points.
Here is an excellent document written by Moore Industries that provides the reader with a good understanding of Fieldbus.