Dynamic self-checking safety circuit means

Details Dynamic self-checking safety circuit means Dynamic self-checking safety circuit means

1981-10-05

1983-12-20

Crosland, Donnie Lee

Communications: electrical

Condition responsive indicating system

With particular system function

340501, 340507, 340515, 340518, 340532, 340635, 361 1, 110191, 110193, 236 1A, 236 89, 236 94, G08B 2900

Patent

active

044220677

ABSTRACT:
A safety circuit which connects a condition responsive circuit to a cyclic signal detecting circuit. In order to provide the cyclic signal detecting circuit with a continuous cyclic input, the condition responsive circuit and a cyclic redundancy checker is provided. The cyclic redundancy checker identifies a specific series of logic bits from the condition responsive circuit and responds favorably only to that series of logic bits. If any other series of logic bits occurs, the cyclic redundancy checker of the system ceases to function, thereby causing the cyclic signal detecting circuit to cease to function and it in turn opens a series contact to deenergize a critical load in a control system.

REFERENCES:
patent: 2798213 (1957-07-01), Rowell
patent: 2798214 (1957-07-01), Rowell
patent: 2807009 (1957-09-01), Rowell
patent: 2807010 (1957-09-01), Rowell
patent: 2807011 (1957-09-01), Rowell
patent: 3390387 (1968-06-01), Hugenholtz
patent: 3569793 (1971-03-01), Pinckaers
patent: 3967281 (1976-06-01), Dageford
1976 Fairchild Camera and Instrument Corporation; Macrologic Bipolar Microprocessor Databook; pp. 3-11 through 3-14.

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