Safety control system
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United States of America Patent
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May 3, 2016
Grant Date -
May 9, 2013
app pub date -
Oct 22, 2012
filing date -
Nov 8, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A safety control system is provided, which is capable of monitoring many more drive circuits by using a single controller without modifying the configurations of the controller and the drive circuit. An a-contact of a relay is electrically connected between a FB (feedback) output terminal and a FB input terminal of a safety controller. A b-contact of the relay is electrically connected between a signal output terminal (safety output (1) terminal) of the safety controller and a signal input terminal (safety input (1) terminal) of a safety drive circuit. A coil of the relay is connected to a FB monitor output terminal of the safety drive circuit. No factor in a large voltage drop is present between the FB output terminal and the FB input terminal, thus making it possible to monitor many more drive circuits by using a single controller.
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