Light barrier, for monitoring machinery, performs self-monitoring signal processing so output signal is inhibited if operating voltage fails and/or transmit/receive part fails and/or signal processing part is defective

摘要

The light barrier has at least one transmit part, at least one receiver part for receiving pulsed light from the transmit part and at least one signal processing part providing an output signal for a controller or the transmit part of another light barrier that performs self-monitoring signal processing so the output signal is inhibited if the operating voltage fails and/or if a transmit/receive part and/or signal processing part is defective.