E they possess both a normally open as well as a

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Unformatted text preview: ires are for the purpose of voltage supply (brown +, blue -). The third wire (black) represents the signal output of the proximity sensor. L a) L b) L c) L d) Load (L) a) PNP normally open contact b) PNP normally closed contact c) NPN normally open contact d) NPN normally closed contact Fig. 10.1.2: Connection diagrams for three-wire technology (DC) © Festo Didactic GmbH & Co. KG • FP 1110 143 10. Connection and circuit technology 10.1.3 Four- and five-wire DC technology Proximity sensors designed in four- or five-wire technology are further divided into proximity sensors with PNP outputs (positive switching) and NPN outputs (negative switching). Unlike proximity sensors in three-wire technology, proximity sensors in four-wire technology are equipped with antivalent switching function, i.e. they possess both a normally open as well as a normally closed output. Devices in five-wire technology feature electrical isolation between the control voltage circuit and the supply voltage (relay output). L a) L b) Load (L) a)...
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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.

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