Importance

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Abstract

There is disclosed a redundant process controller for use in a process facility having a plurality of process systems that produce process data, wherein the process data are gathered by process controllers associated with the process systems and are exchanged by the process controllers via a network. The redundant process controller is associated with a first selected process system and is capable of receiving process data from at least one remote process controller and intermittently transferring the received process data to the first selected process system. The redundant process controller comprises 1) a primary process controller capable of storing the received process data, wherein the primary process controller transmits the received process data to the first selected process system; and 2) a secondary process controller capable of storing the received process data, wherein the secondary process controller detects failures in the primary process controller and, upon detection of a failure, transmits to the first selected process system the received process data in lieu of the primary process controller.

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First Claim