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Unformatted text preview: rs with an NPN transistor output are also possible. The designations PNP and
NPN output are nevertheless widely used. © Festo Didactic GmbH & Co. KG • FP 1110 145 10. Connection and circuit technology 10.2.1 PNP-output
In the case of direct current proximity sensors with PNP output, the output is
connected to positive potential in the switched state. This means that if a load is
connected (display, relay, ...), one connection must be connected to the proximity
sensor output and the other connection to 0 V. PNP proximity sensors are positive
switching. BN(1) +24 V DC BK(4)
L BU(3) 0V Load (L) Fig. 10.2.1: PNP output (The purpose of the diodes is to provide a protective circuit) PNP-proximity sensors can be differentiated as being "normally closed" or
"normally open". L Load (L) Fig. 10.2.2: PNP normally open contact 146 © Festo Didactic GmbH & Co. KG • FP 1110 10. Connection and circuit technology L Load (L) Fig. 10.2.3: PNP normally closed contact 10.2.2 NPN-output
In the case of proximity sensors with NPN-o...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12