Verfahren und Anordnung zum Prüfen eines Doppelsensorsystems

摘要

With a double sensor system used for positioning purposes in safety applications, an operating failure, including an inadmissible increase in the sensitivity of one of the sensors (S1, S2), is made known because reference marks (RM1, RM2) each having a response section (AA1, AA2) and a test section (PA11, PA21) are provided for. If operations are proceeding correctly the sensor emits a first output signal (AS1) in the area of the response section and a second output signal (AS1) in the area of the test section. In contrast, when a maximum sensitivity threshold (P) is exceeded the sensor also produces the first output signal (AS1) in the area of the test section. If there is a known change in the signal of the other sensor this is used to test the change in the output signal of the first sensor.