Sensor for detection of movement of encoders, has test circuit directly monitoring output signals of sensor units and making ineffective or correcting sensor output signal if faults of output signals of sensor units are detected

摘要

The sensor has two sensor units (6, 7) placed shiftily to each other in movement direction of the encoders. Processing circuits convert the output signals of the sensor units into the sensor output signal. A test circuit (14) directly monitors the output signals of sensor units and makes ineffective or correct the sensor output signal if the faults of the output signals of the sensor units are detected. An independent claim is also included for a device for detection of movement of encoders.