Provided this requirement is met the polarity of the

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Unformatted text preview: SW, DSW 2 2 10.5 12 DN, DNZ 3 5 8 17 DNNZ 3 5 8 17 DGS 25 32 40 50 Table 16.2.1: Hysteris and response range of various cylinders (example) Again for the Festo cylinder DNNZ with a diameter of 32 mm, a value for vmax of 0.467 m/s is obtained for a valve with a response time of 15 ms. 254 © Festo Didactic GmbH & Co. KG • FP 1110 16. Solutions Exercise 3.2 Electrical connection of a reed proximity sensor BN(1) +24 VDC BK(4) RL R Series resistor (R) BU(3) Load (RL) 0V Light emitting diodes (L1, L2) Fig. 16.2.1: Circuit diagram of reed proximity sensor In the case of a proximity sensor with reed contacts, a circuit is built-in for protection against inductive switch-off peaks, which at the same time acts as a bipolar switching status display. The protection diodes are connected parallel to load L via the series resistance, similar to the protective circuit shown in Fig. 16.1.1. The protective circuit also works with an alternative supply voltage. When a load is connected, care should be taken that the load r...
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