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Preventa XU - Root cause of the connection error in the cascaded light curtain XUSL4E14F031NM master + XUSL4E30H106NS1 slave, having 2 successive orange flashes in the master transmitter

Meaning of the 2 successive orange flashes in the transmitter part : master/slave communication interruption. How to solve : check master/slave connections, and restart the system (user manual information). After checking the connections of the master and slave, it appears the following connection misuse: connection of the slave transmitter to the master receiver and the slave receiver to the master transmitter (devices crossed). After changing the slave connections, the issue is solved.
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