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Unformatted text preview: connected without major
limitations, if the residual currents of the signal outputs are sufficiently small in the
non switched status. This is the case with most proximity sensors so that for
instance up to 20 or 30 proximity sensors can be parallel connected. Also, a
combination of proximity sensors and mechanical switches is possible.
The decoupling diodes illustrated in the sketch are provided in order to prevent the
activated sensor from being loaded with the output operating resistances of other
parallel connected sensors. Moreover, this avoids all LEDs illuminating in the case of
sensors with LED displays. If the diodes are an integral part of the sensor protection
circuitry, no additional external diodes are necessary.
Parallel connection of AC sensors is not recommended, as malfunction can occur
during oscillator start-up. 150 © Festo Didactic GmbH & Co. KG • FP 1110 10. Connection and circuit technology 10.3.4 Series connection of proximity sensors using two-wire techno...
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- Spring '12