Method of input signal resolution for actively redundant process

Details Method of input signal resolution for actively redundant process Method of input signal resolution for actively redundant process

1992-08-04

1996-12-10

Envall, Jr., Roy N.

Boots, shoes, and leggings

39518313, 39518502, 364187, 371 681, G05B 902

Patent

active

055837573

ABSTRACT:
A method of input signal resolution in a process control system where each of the actively redundant process control computers performs a common arbitration process on corresponding input signals. Blocks of corresponding input signals are mutually exchanged by the actively redundant process control computers, and an initial check is made to determine if these input signals are valid. For input signals representing valid analog values, a determination is made as to whether a predefined tolerance has been exceeded between corresponding input signals in the present process control cycle. When the predefined tolerance has been exceeded, then a check will be made to determine the predefined tolerance was also exceeded in the last process control cycle. If the predefined tolerance was not exceeded in the last process control cycle, then the analog input value selected during the last process control cycle will be employed in the present process control cycle. If the predefined tolerance was exceeded in both the present and the last process control cycle, then a predetermined magnitude criteria will be used to select the analog input value for use in making process control decisions. An indication will also be provided in each of the actively redundant process control computers to identify which of the corresponding input signals were selected by that process control computer.

REFERENCES:
patent: 3654603 (1972-04-01), Gunning et al.
patent: 3681578 (1972-08-01), Stevens
patent: 3895223 (1975-07-01), Neuner et al.
patent: 4105900 (1978-08-01), Martin et al.
patent: 4304001 (1981-12-01), Cope
patent: 4342083 (1982-07-01), Freedman et al.
patent: 4375683 (1983-03-01), Wensley
patent: 4583224 (1986-04-01), Ishii et al.
patent: 4593396 (1986-06-01), Anderson, Jr.
patent: 4663704 (1987-05-01), Jones et al.
patent: 4683105 (1987-07-01), Hager
patent: 4696785 (1987-09-01), Cook
patent: 4787041 (1988-11-01), Yount
patent: 4868826 (1989-09-01), Smith et al.
patent: 4868851 (1989-09-01), Trinidad et al.
patent: 4916612 (1990-04-01), Chin et al.
patent: 4958270 (1990-09-01), McLaughlin et al.
patent: 4965717 (1990-10-01), Cutts, Jr. et al.
patent: 4995040 (1991-02-01), Best et al.
patent: 5086429 (1992-02-01), Gray et al.
patent: 5086499 (1992-02-01), Mutone
patent: 5142470 (1992-08-01), Bristow et al.
Journal A, vol. 31, No. 4, Dec. 1990, Antwerp, BE pp. 33-40, XPoo178688, R. Cuyvers et al.
IEEE Spectrum, Jun. 1985, The X-29: Is It Coming Or Going?, Gadi Kaplan.

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