Other designations are p switching or positive

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: PNP normally open/normally closed contacts b) NPN normally open/normally closed contacts Fig. 10.1.3: Connection diagram of four-wire technology (DC) 144 © Festo Didactic GmbH & Co. KG • FP 1110 10. Connection and circuit technology 10.1.4 Terminal designation Function Colour Designation Positive supply voltage (+) brown BN Negative supply voltage (-) blue BU Switch output black BK Antivalent switch output white WH Table 10.1.1: Terminal designation of proximity sensors Terminal designation is in accordance with European standard EN 50 044. The colour short code is laid down in the international standard IEC 757. 10.2 Positive and negative switching outputs Generally, two proximity sensor designs are distinguished, PNP (positive switching) and NPN (negative switching). Other designations are P-switching or positive switching as well as N-switching or negative switching. Positive switching proximity sensors usually have a PNP transistor output. However, positive switching proximity senso...
View Full Document

Ask a homework question - tutors are online