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In addition a greater nominal switching distance

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Unformatted text preview: arts containers is established by means of counting the output pulses of proximity sensors. If one assumes that the transport speed is constant, the time difference between two consecutive proximity sensor pulses can be converted into the distance between the parts containers. A second proximity sensor is required for direction detection. It is necessary to establish the sequence in which the two proximity sensors emit an output signal to obtain the information in respect of direction. 256 © Festo Didactic GmbH & Co. KG • FP 1110 16. Solutions Fig. 16.3.1: Schematic assembly of transport device With inductive proximity sensors the switching distance is dependent on the material to be detected. In this case, the nominal switching distance specified in the data sheets must be multiplied by the value 0.5 (reduction factor for aluminium). This results in a value which is only half as great as the nominal switching distance specified in the data sheet. Because the distance between the aluminium container and the proximity sensor can fluctuate, it is important to select a proximity sensor with a switching distanc...
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