Circuit arrangement and device for safely disconnecting an element in an installation, in particular a machine installation
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United States of America Patent
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Issued Date -
Dec 5, 2002
app pub date -
Jun 19, 2002
filing date -
Dec 23, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a circuit arrangement for safe disconnection of an installation, in particular a machine installation. The arrangement comprises a signaling device which produces a defined output signal depending on an operating condition of the installation. Furthermore, it comprises a safety switching device which disconnects the installation in a fail-safe manner depending on the defined output signal. The defined output signal comprises a steady-state signal level over a period of time during operation of the installation. According to one aspect of the invention, the safety switching device comprises a clock generator for generating a clock signal, and an input stage which modulates the output signal from the signaling device with the clock signal.
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