Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-10-06
2008-10-21
Nguyen, Phung T. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S657000, C324S066000
Reexamination Certificate
active
07439869
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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Nguyen Phung T.
Quarles & Brady LLP
Rockwell Automation Germany GmbH & Co. KG
Walburn William R.
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