Evolution of NCS

Networked Control System

DISTRIBUTED CONTROL SYSTEM

• A system of dividing plant or process control into several areas of responsibility, each managed by its own controller, with the whole system connected to form a single entity, usually by means of communication buses..

Localized vs DistributedLocalized Distributed

Processing tool

Programmable logic controller / Programmable controller

Remote Terminal Unit

Priority Data AcquisitionLocal AutomationData Transmission (Opt)

Data AcquisitionData TransmissionLocal Automation (Opt)

•Both PLC/PC and RTU support all automation functions only the priority/ sequence differ.•In practice, it is possible to use a Controller as RTU or RTU as Controller