Safety system with test signal path through bus line and termination element
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United States of America Patent
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Nov 28, 2017
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app pub date -
Oct 2, 2013
filing date -
Oct 10, 2012
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Abstract
Multiple safety related participants are arranged along a bus line in such a way that both a forward test signal path and a return test signal path run through the same safety related participants and the safety related participants are adapted in such a way that the occurrence of a non-secure state of their protective device brings about an interruption of the test signal path. A termination element connects the forward test signal path to the return test signal path. The safety unit is configured to transmit an output signal at its output and the termination element is configured to receive the output signal from the forward test signal path and to output a test signal to the return test signal path. The test signal is changed with respect to the received output signal in dependence on the received output signal.
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