Dynamic self-checking safety circuit means

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

G - Physics

05

B

341/110

G05B 15/02 (2006.01) G05B 11/01 (2006.01) G08B 29/16 (2006.01)

Patent

CA 1180792

ABSTRACT OF THE DISCLOSURE 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 favourably 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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