Patent
Processor synchronization scheme
M Kleidermacher,C Maginnis,R Zieve +2 more
- 04 May 1971
116
TL;DR: In this article, a method of maintaining synchronization between two independently clocked, stored-program computer processors which are executing the same program simultaneously and are connected in a master-slave relationship is presented.
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Abstract: A method of maintaining synchronization between two independently clocked, stored-program computer processors which are executing the same program simultaneously and are connected in a master-slave relationship. There is further provided a method of preventing a failure from disabling both master and slave units. A special function is inserted at selected intervals which delays the master processor until the slave processor catches up. Further, means are provided to automatically detect when a failure occurs. This program alignment and error detection are accomplished by inserting checkpoints at selected intervals at which the redundantly processed results are compared.
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Citations
Patent
Methods and apparatus for control using control devices that provide a virtual machine environment and that communicate via an ip network
Alexander Johnson,Paul C. Badavas,T. Eric Christiansen,Peter D. Hansen,Thomas B. Kinney,Seyamak Keyghobad,Bo Ling,Richard L. Thibault +7 more
- 20 Jul 2007
TL;DR: In this article, the authors describe a virtual machine for control using field and control devices that provide a virtual environment and communicate via an IP network. But their work is limited to the control of a single field device.
378
Patent
Fault-tolerant computer system with online recovery and reintegration of redundant components
Douglas E. Jewett,Tom Bereiter,Bryan Vetter,Randall G. Banton,Richard W. Cutts,Donald C. Westbrook,Krayn W. Fey,John Posdro,Kenneth C. Debacker,Nikhil A. Mehta +9 more
- 08 Jan 1999
TL;DR: In this article, a fault-tolerant configuration of multiple identical CPUs executing the same instruction stream, with multiple identical memory modules in the address space of the CPUs storing duplicates of the same data, is presented.
360
Patent
Methods and apparatus for control configuration with versioning, security, composite blocks, edit selection, object swapping, formulaic values and other aspects
Keith Eldridge,Paul Meskonis,Robert Hall,Kenneth A. Burke,Scott Volk,Mark Johnson,Brian Mackay,Steven Dardinski +7 more
- 17 May 2000
318
Patent
Backup system that takes a snapshot of the locations in a mass storage device that has been identified for updating prior to updating
Richard Ohran
- 08 Nov 1996
TL;DR: In this article, a system and method for maintaining logically consistent backups using minimal data transfer is presented, which comprises a backup system having a backup storage device and one or more primary systems having mass storage devices that are to be backed up on the backup storage devices.
315
Patent
Process control configuration system with connection validation and configuration
Steven Dardinski,Keith Eldridge,Robert Hall,Mark Johnson,Brian Mackay,Paul Meskonis,Scott Volk +6 more
- 14 Feb 2006
TL;DR: In this article, a set of data structures (e.g., the object connection type structures) identify valid types for component-to-component pairings and the respective roles of each component in the pairing.
294
References
Patent
Duplexing system for controlling online and standby conditions of two computers
Leibholz Stephen W,Moore Clarence J +1 more
- 17 Jan 1963
69
Patent
Method and system for the automatic control of chemical plants with parallel-connected computer backup system
Hermann Amrehn Dipl-Phys Dr
- 14 Jun 1968
TL;DR: In this article, a method and system for the automatic control and regulation of chemical processes in chemical plants using digital process computers is presented, which comprises operating at least two identical computers in parallel, each equipped with an operating core storage means (principal memory means) and a mass storage mean (secondary memory means), connected with a chemical plant by means of a data flow bus.
65
Patent
Computer communications system
Melvin L Doelz,Robert F Martin,Fred K Morioka +2 more
- 25 Aug 1969
TL;DR: In this article, the disc-file storage unit is the primary storage for one computer and the copy storage for another computer, and upon the failure of a primary disc file storage unit, a computer can operate with the copy unit.
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