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DCS: System Architecture
The DCS offered many advantages over its predecessors.
For starters, the DCS distributed major control functions,
such as controllers, I/O, operator stations, historians, and
configuration stations onto different boxes. The key system
functions were designed to be redundant. As such the DCS
tended to support redundant data highways, redundant controllers,
redundant I/O and I/O networks, and in some cases
redundant fault-tolerant workstations. In such configurations,
if any part of the DCS fails the plant can continue to operate.
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timesDISTRIBUTED CONTROL SYSTEMS
Generally, the concept of automatic control includes accomplishing two major
operations; the transmission of signals (information flow) back and forth and the
calculation of control actions (decision making). Carrying out these operations in real
plant requires a set of hardware and instrumentation that serve as the platform for these
tasks. Distributed control system (DCS) is the most modern control platform. It stands
as the infrastructure not only for all advanced control strategies but also for the lowliest
control system. The idea of control infrastructure is old. The next section discusses how
the control platform progressed through time to follow the advancement in control
algorithms and instrumentation technologies.
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Last download: Wed May 15, 2013 03:03:56 PM
