independent physical entity capable of performing one or more specified functions in a particular context and delimited by its interfaces

Note 1 to entry: See IEC 61499-1.

Note 2 to entry: Devices provide sensing, actuating, communication, and/or control functionality. Examples include transmitters, valve controllers, drives, motor controllers, PLCs, and communication gateways.

Note 3 to entry:  A Device can be a system (topology) of other Devices, components, or parts.