A family of industrial computer network protocols used to connect instruments, actuators, and sensors to programmable logic controllers. It replaces traditional point-to-point wiring with a single network cable that carries multiplexed digital signals. This drastically reduces wiring complexity and allows for advanced device diagnostics.
Heard on the job
The new smart relays communicate over the fieldbus rather than relying on hardwired trip signals.
Related terms
SCADA
Supervisory control and data acquisition: the system that lets a control room watch and switch remote plant.
IED
A microprocessor-based controller used in substations to monitor, protect and control power equipment.
Controller
A device or assembly that governs the performance of an electric motor or system.