Fig 312 illustrates the internal and external

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Unformatted text preview: tance 0.1 Ω Contact service life (with protective circuit) 5 Million switching cycles Protection class (IEC 529, DIN 40050) IP66 Ambient operating temperature -20 – +60 °C Table 3.1.1: Technical characteristics of reed proximity sensor Reed proximity sensors often have a built-in light emitting diode to indicate operating status. Fig. 3.1.2 illustrates the internal and external connections. The light emitting diodes in conjunction with the series resistor assume the function of a protective circuit for an inductive load. BN(1) +24 VDC BK(4) RL R Load resistance (RL) BU(3) 0V Light emitting diodes (L1, L2) Protective resistor (R) Fig. 3.1.2: Block circuit diagram of a reed proximity sensor with light emitting diode 36 © Festo Didactic GmbH & Co. KG • FP 1110 3. Magnetic proximity sensors When a permanent magnet is moved past a reed proximity sensor, several switching ranges are possible (see Fig. 3.1.3). The switching ranges depend on the orientation of the pole axis of the magnet. Fig. 3.1.3: Response characteristics of a reed proximity sensor © Festo Didactic GmbH & Co. KG • FP 1110 37 3...
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