Computer-based interlocking system

Details Computer-based interlocking system Computer-based interlocking system

1982-09-28

1985-05-14

Smith, Jerry

Excavating

371 68, G06F 1100, G06F 1108

Patent

active

045176736

ABSTRACT:
An interlocking system comprising a plurality, e.g., three, of parallel sub-systems operating asynchronously to produce identical replicated outputs which are mutually compared to determine the correct output and disqualifying a minority output thereby ensuring high system integrity. Each sub-system includes a similar arrangement for computing the difference between all possible pairs of sub-systems. Comparison of these results with a reference table of all possible difference results and then comparison of the difference equations yields a common factor which is the sub-system producing the error. Action can then be taken to disqualify its output, e.g., by switching-off its power supply. A final output is taken, preferably from one sub-system, with a second as standby. To accomodate asynchronous running, a final output is only acted upon if it is repeated in a succeeding output cycle thus permitting opportunity to disqualify the preferred output if it is judged in error by the other sub-systems and to replace it by the standby.

REFERENCES:
patent: 3501743 (1970-03-01), Dryden
patent: 3538498 (1970-11-01), Games et al.
patent: 3593307 (1971-07-01), Gouge et al.
patent: 3863215 (1975-01-01), McGrogan, Jr.
patent: 4270715 (1981-06-01), Norton et al.

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