A distributed control system (DCS) is a computerised control system for a process or plant usually with many control loops, in which autonomous controllers are distributed throughout the system, but there is no central operator supervisory control. DCS or Distributed Control System is a network of Highly Powerful PLCs and Data Server. PLC is usually used for controlling medium or large scale applications, whereas DCS is used for controlling entire plant
In terms of applications, DCS is used for installations within a confined area, like a single plant or factory and for a complex control processes. Some of the application areas of DCS include chemical plants, power generating stations, pharmaceutical manufacturing, oil and gas industries, etc.
Direct control systems (DCS) are microprocessor-based. A communication network is developed based on the communication from multiloop controllers. It is known as data highway or node. A single control loop is not involved with many control loops. ... A host computer and several local computers is known as a DCS.
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