The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 2013
Filed:
Feb. 16, 2011
Alan A. Gale, Windham, ME (US);
Andrew L. Kling, Foxboro, MA (US);
Mark E. Timperley, East Greenwich, RI (US);
Lawrence T. Bass, West Greenwich, RI (US);
John J. Lavallee, Wrentham, MA (US);
George W. Cranshaw, Assonet, MA (US);
Alan M. Foskett, Mansfield, MA (US);
Alan A. Gale, Windham, ME (US);
Andrew L. Kling, Foxboro, MA (US);
Mark E. Timperley, East Greenwich, RI (US);
Lawrence T. Bass, West Greenwich, RI (US);
John J. Lavallee, Wrentham, MA (US);
George W. Cranshaw, Assonet, MA (US);
Alan M. Foskett, Mansfield, MA (US);
Invensys Systems, Inc., Foxboro, MA (US);
Abstract
A dual redundant process controller is provided. The controller comprises a first processor, memory, and instance of a process control application stored in the first memory. The controller further comprises a second processor, memory, and instance of the process control application stored in the second memory. When executed by the first processor, the first application instance writes a first synchronization information to the second memory, reads a second synchronization information from the first memory, and, when the second synchronization information disagrees with the first synchronization information after passage of a predetermined time-out interval, performs a resynchronization function; and wherein, when executed by the second processor, the second application instance writes the second synchronization information to the first memory, reads the first synchronization information from the second memory, and, when the first synchronization information disagrees with the second synchronization information after passage of the predetermined time-out interval, performs the resynchronization function.