Leuze Electronic Gmbh +co.

Rolf Brunner

George Moll

An optoelectronic device for detecting objects in a monitoring range with a distance sensor includes a transmitter for transmitting light rays and a deflection unit on which the transmitted light rays are reflected for periodically sweeping the transmitted rays over the monitoring range. A receiver for the light rays is coupled to an evaluation unit. The evaluation unit includes means for storing dimensions of different monitoring ranges and several inputs each of which is operatively associated with a respective one of the stored dimensions of the different monitoring ranges. The evaluation unit further includes a test output for emitting a test signal having a predetermined signal value. A separate feed line is connected to each of the several inputs and a separate switch is connected via a respective one of the feed lines to a respective one of the inputs of the evaluation unit. Upon activation of one of the switches a predetermined signal value is transmitted to the respective input for activating the input thereby activating the respective stored monitoring range so that objects in the activated monitoring range are detected. The test output of the evaluation unit is coupled to each of the feed line. For test purposes, the test signal is transmitted via the test output to each of the feed line. An error-free operation is signified if the predetermined signal value of the test signal is present at the respective inputs of the evaluation unit.

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Bissingen/Teck, Germany

Rolf Brunner