Special sensor designs are used where the black

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Unformatted text preview: rs, including the connection cables are constantly monitored for correct function. © Festo Didactic GmbH & Co. KG • FP 1110 233 15. Special designs and variants of proximity sensors 7 Output error 5 Input 1. efector Output 1. efector 1 I2 Input 2. efector Output 2. efector 2 I3 Input 3. efector Output 3. efector 3 Output 4. efector 4 8 9 Input voltage supply 24 V DC I1 Clock 10 12 13 14 C C Evaluation logic 11 15 16 I4 Input 4. efector 6 External test Test key Fig. 15.1.6: Block diagram of a function monitoring circuit (Source: IFM) O1 O2 O3 O4 F External rest 1 2 3 4 5 6 C I2 I3 C 11 12 13 14 Power supply 24 V DC I1 9 10 blue I4 15 16 black brown 8 blue black 7 brown Fig. 15.1.7: Connection of a function monitor, Example using 2 sensors (Source: IFM) 234 © Festo Didactic GmbH & Co. KG • FP 1110 15. Special designs and variants of proximity sensors The function monitor generates sensing pulses to monitor the sensors which are connected to it. The pulses reach the black signal connections of the sensors via a common timing circuit. Special...
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