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Fieldbus

Definitions:

  A digital, serial, multi-drop, two-way data bus or communication path or link between low-level industrial field equipment, such as sensors, transducers, actuators, local controllers, and even control room devices. Use of fieldbus technologies eliminates the need for point-to-point wiring between the controller and each device. A protocol is used to define messages over the fieldbus network, and each message identifies a particular sensor on the network.
Sources:
NIST SP 800-82r3