Safety switching device with universal signal input
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United States of America Patent
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Jun 9, 2015
Grant Date -
Aug 25, 2011
app pub date -
Feb 21, 2011
filing date -
Feb 19, 2010
priority date (Note) -
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Abstract
The present invention relates to a safety switching device for actuating actuators in a fail-safe manner, and further relates to an emergency shut-off circuit comprising a safety switching device according to the present invention. The safety switching device includes at least one first and second safety input for receiving a first and second input signal, at least one first and second safety output for transmitting a first and second output signal, and a control unit for evaluating said input signals and for generating said output signals. The first and second safety outputs further comprise a feedback loop said that couples the output signals back to the control unit such that the control unit is operable to perform a test routine for testing said output signals.
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