Method and apparatus for interface dual modular redundancy

Details Method and apparatus for interface dual modular redundancy Method and apparatus for interface dual modular redundancy

1997-10-15

1999-12-14

Grant, William

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Having protection or reliability feature

714 11, G05B 902

Patent

active

060029706

ABSTRACT:
Controller triple modular redundancy is substantially achieved and reliability improved in a system having duplicate controllers that serve peripheral units. Both controllers detect suspected faults in itself and in the other controller. A peripheral unit that suspects a faulty active controller requests a switch of the active controller. A voting circuit processes votes from the controllers and the active controller switch signal from the peripheral units to select the active controller. The signaling paths between the controllers used to convey votes and active controller information are duplicated. The signals on these signaling paths convey information by using oscillating signals of different frequencies.

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patent: 4562575 (1985-12-01), Townsend
patent: 5630046 (1997-05-01), Loise
patent: 5689632 (1997-11-01), Galy et al

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