Dynamic self-checking safety circuit means
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United States of America Patent
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Dec 20, 1983
Grant Date -
N/A
app pub date -
Oct 5, 1981
filing date -
Oct 5, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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