Process control network with redundant field devices and buses

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United States of America Patent

PATENT NO 6047222
SERIAL NO

08983019

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Abstract

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Functional elements within a two-wire, loop-powered, two-way digital communications environment are interconnected using selective redundant connections and selective redundant functional elements. The redundant functional elements and redundant connections provide a smooth transition from operation of a primary process loop element to a secondary process loop element in the event of a failure of the primary process loop element. Redundancy is selectively implemented using a redundant pair of field devices or a redundant bus pair having a primary bus and a redundant bus. In a first case, redundancy is selectively implemented using a single set of communication media, such as a single communication loop, but implementing redundant functional elements, such as field devices, so that recovery is achieved upon failure of a functional element but not upon failure of the communication media. In a second case, redundancy is selectively implemented using a redundant set of communication media in addition to use of redundant devices so that recovery is attained both for a failing device and a failing communication media. In a third case, redundancy is selectively implemented using a redundant set of communication media but using a single device so that recovery is attained for a failing communication media but not for a failing device.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
FISHER CONTROLS INTERNATIONAL LLCMARSHALLTOWN, IA, US269

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Brown, Larry K Marshalltown, IA 14 1217
Burns, Harry A Marshalltown, IA 10 1136
Larson, Brent H Marshalltown, IA 16 1300

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