Dual computer cross-checking system

Details Dual computer cross-checking system Dual computer cross-checking system

1988-12-19

1991-05-14

Smith, Jerry

Excavating

371 55, 371 683, G06F 1100

Patent

active

050162497

ABSTRACT:
A dual computer cross-checking system includes a control computer for controlling a process in accordance with input data and a monitoring computer. The two computers are interconnected to exchange check data on a cyclic basis, each computer carrying out a number of processing operations on the received check data before transmitting the data thus processed to the other computer. In addition, each computer checks the received check data against an expected value. An error condition is detected if the result of at least one of these comparisons is found to be incorrect.

REFERENCES:
patent: 3618015 (1971-11-01), Homonick
patent: 3810119 (1974-05-01), Zieve
patent: 4012717 (1977-03-01), Censier
patent: 4400792 (1983-08-01), Strelow
patent: 4566101 (1986-01-01), Skonieczy
patent: 4590549 (1986-05-01), Burrage
patent: 4773072 (1988-09-01), Fennel
patent: 4792955 (1988-12-01), Johnson
patent: 4843608 (1989-06-01), Fu

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