• Multiple process controlstations located throuhout the plant to control of the indivual loops and devices of the process
• A central control room equipped with operator stations, where supervisory control of the plant is accomplished.
Groover, Automation, Production Systems and CIM. P.102
With the development of the microprocessor, it became feasible to connect multiple microcomputers together to share and distribute the process control workload, The term distributed control system (DCS) is uded to describe such a configuration. which consists of the following components and features:
• Local operator stations ditributed throughout the plant. This provides the DCS with redundancy. If a control failure occurs in the central control room. the local operator stations take over the central control functions. If a local operator station fails, the
other local operator stations assume the functions of the failed station.
• All process and operator stations interact with each other by means of a communications
network, or a data highway as it is often called
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