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It is a kind of control system associated with the manufacturing process or system. In this system the components of the controller elements are not positioned in the center stage. Rather it is distributed through the system. And each of its components is controlled by a separate controller or controllers. This system of controllers is interconnected to each others for monitoring and communication. Basically distributed control system is very broad term widely used in multiple industries. Its main function is to monitor and control the distributed equipments. A DCS system is applied for operations such as electric generation plants, electrical power grids, environmental control systems, traffic signals, water management systems, oil refining plants and chemical plants. Some other units like pharmaceutical manufacturing, sensor networks, bulk oil carrier ships and dry cargo also apply distributed control system in their operations.

In DCS custom designed processors are used for controlling the operation of the unit. It uses both protocol and proprietary interconnections for communications. The component parts of the DCS is the input and output modules. The input modules provide information to the processor which sends it to the output modules. The input instruments give information to the input modules and output instruments give information to the output modules. In the DCS the processors and modules are connected through multiplexes but the electrical buses or computer buses.

The distributed controllers in the DCS are also connected through computer buses which are finally connected to the central controller which is finally connected to the human computer interface. The main application distributed control system is to control manufacturing processes in units such as petrochemicals, oil refining, pharmaceutical and power generation stations. It also controls the flow of material through the manufacturing unit. A DCS has the geographically or functionally digital controllers that can execute from 1 to 256 and even more control loops in a single control box. The input and output devices are integrated with the controller through a filed network. Nowadays the controllers in the DCS have wide computational capabilities. Apart from integral, proportional and derivative control it can perform both sequential and logic control.

The distributed control system was first introduced in the year 1975. it could be possible through the minicomputers. But now there is major breakthrough in the field of computers and computers of high precision has become the order of the day. Now the digital communication between the work stations, several computing elements and the distributed controllers are the primary advantages of the DCS.

Advanced Automation Associates, one of the leading automation engineering [http://www.advancedautomation.com/process_automation.html] service provider in USA. It provides factory automation [http://www.advancedautomation.com/factory_support.html] and distributed control systems [http://www.advancedautomation.com/distributed_control_systems.html].

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