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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
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.
- Spring '12