November 2007

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HP Control: Restoring single-loop integrity to process control

With today's evolving strategies for plant automation, many end users are asking: Should process control loops remain in a centralized distributed control system (DCS) or programmable logic controller..

With today's evolving strategies for plant automation, many end users are asking: Should process control loops remain in a centralized distributed control system (DCS) or programmable logic controller (PLC), or can they be implemented in a "truly distributed" architecture with control residing in intelligent instrumentation? Although some companies are reluctant to abandon the familiar DCS or PLC environment, an increasing number of users are now choosing to locate most, if not all, regulatory and advanced control functions in field devices. Background. Starting in the early 1990s, the rise of fieldbus technology had a significant impact on process automation strategies. Plants installin

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