Indicating device, circuit arrangement and method for indicating the status of one of a plurality of switches connected in series to a safety relay
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United States of America Patent
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Oct 21, 2008
Grant Date -
Sep 21, 2006
app pub date -
Oct 6, 2005
filing date -
Mar 16, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit arrangement for indicating the status of one of a plurality of switches connected in series between signal terminals of a safety relay, each switch actuable between an open position and a closed position. The circuit arrangement includes at least one voltage sensor configured to be connected to one of the plurality of switches to provide an output signal upon sensing a presence of a voltage across the one of the plurality of switches and an indicating means associated with the voltage sensor to provide an indication signal when the voltage sensor provides an output signal. The circuit arrangement is powered by the voltage provided at one of said signal terminals of the safety relay.
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