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As a rule, series connection of proximity sensors using two-wire technology is to be
avoided. If it is unavoidable, the following points must be observed.
• The supply voltage is distributed to each series connected sensor. If identical
proximity sensors are used, the following applies in respect of the voltage for
each proximity sensor (in activated status):
VPr oximity sensor = VSupply voltage (n = Number of proximity sensors) n • In the switched through status, a voltage drop occurs through each proximity
sensor (approximately 0.7 – 2.5 V per sensor). When calculating the load, it
should also be taken into account that the voltage through the load is full supply
voltage reduced by the individual voltage drops through the in series connected
proximity sensors. + 24 V DC
BU(3) V V1 BN(1)
BU(3) V2 L 0V
Load (L) Fig. 10.3.3: Series connection in two-wire technology © Festo Didactic GmbH & Co. KG • FP 1110 151 10. Connection and circuit technology 10.3.5 Series connection of proximity sensors using three-wi...
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- Spring '12