Atmospheric and Vacuum Distillation Unit

In: Computers and Technology

Submitted By marcuslemon23
Words 367
Pages 2
3/9/15

Distributive Control System
(DCS)

A distributed control system, is a control system for a process or plant, wherein control elements are distributed throughout the system. Distributed Control System is a specially designed control system used to control complex, large and geographically distributed applications in industrial processes. In this, controllers are distributed throughout the entire plant area.
These distributed controllers are connected to both field devices and operating PCs through high speed communication networks as shown in figure.
Discrete Field devices such as sensors and actuators are directly connected to input and output controller modules through communication bus. These field devices or smart instruments are capable of communicating with PLC’s or other controllers while interacting with real world parameters like temperature, pressure, etc. Controllers are distributed geographically in various section of control area and are connected to operating and engineering stations which are used for data monitoring, data logging, alarming and controlling purpose via another high speed communication bus.
Distributed Control System continuously interacts with the processes in process control applications ones it gets instruction from the operator. It also facilitates to variable set points and opening and closing of valves for manual control by the operator. Its human machine interface (HMI), face plates and trend display gives the effective monitoring of industrial processes.
Distributed controller or Local control unit
It can be placed near to field devices (sensors and actuators) or certain location where these field devices are connected via communication link. It receives the instructions from the engineering station like set point and other parameters and directly controls field devices.
It can sense and control both analog and…...

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