Process control network with redundant field devices and buses

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6047222
SERIAL NO

08983019

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ATTORNEY / AGENT: (SPONSORED)

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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, US259

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Brown, Larry K Marshalltown, IA 14 1178
Burns, Harry A Marshalltown, IA 10 1108
Larson, Brent H Marshalltown, IA 16 1258

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