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DCS Process control
For example, in a particular paint processing plant it is necessary to develop various chemicals and mix them at different times. A process control is needed for one part of the system as well as another, and when the appropriate chemicals are mixed they need to then be moved down the line to be mixed together again. These are the sorts of processes that require a complicated control system with multiple logical controls and some sort of interconnected communication system. These systems are known as DCS or distributed control systems, because the control is distributed throughout the system. A DCS works according to a system that uses input an output modules. The input modules take in information and then transfer it to the output. This process is mediated usually by a computer that measures the changes in the system and makes appropriate alterations. If, for example, one of the controllers in a chemical process registers a change the information is relayed to a computer which can then alter the way that an out put in the process works. This then can alter all of the processes in the entire system-either speeding them up or slowing them down. Often the DCS system works by actually connecting to and controlling the system. It is attached to things such as the valves or tubes that make up the process and can change them as needed. Many DCS controllers work according to sensors and a set point. A sensor monitors how a particular chemical is passing through the process. The sensor measures the pressure in a line and communicates this information to the controller. The controller then operates a control valve which can change the way the situation works. There are some systems that have literally thousands of measuring devices used in order to maintain a large chemical plant.
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