By means of series or parallel connections it is

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Unformatted text preview: utput, the output is connected to the negative potential in the switched state. This means that if a load is connected (display, relay, ...), one connection is connected to the proximity sensor output and the other connection to the positive potential. BN(1) BK(4) BU(3) +24 V DC L 0V Load (L) Fig. 10.2.4: NPN output (The purpose of the diodes is to provide a protective circuit) In the same way, one differentiates between "normally closed" and "normally open" with NPN proximity sensors. © Festo Didactic GmbH & Co. KG • FP 1110 147 10. Connection and circuit technology L Load (L) Fig. 10.2.5: NPN normally open contact L Load (L) Fig. 10.2.6: NPN normally closed contact 10.3 Circuit technology Usually, logic operations of the proximity sensor are carried out by the controller. By means of series or parallel connections it is possible to achieve the logic operation of several sensors. 10.3.1 Parallel and series connection of proximity sensors With parallel connection, it is possib...
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