Sensor circuit for a device performing a safety function, device and method for processing measurement values of sensors

A sensor circuit for a device performing a safety function comprising

• at least two sensors, wherein each of the sensors is configured to detect a respective measured variable and to generate a measurement signal comprising a measurement value which is monotonically dependent on the respective measured variable,
• at least two comparison circuits, wherein each of the comparison circuits is assigned to one of the sensors and comprises a measurement input for receiving the measurement signal of the respective assigned sensor, a reference input for receiving a reference signal to define a trigger threshold value of the comparison circuit, and a comparison circuit output, wherein the comparison circuit output can assume a first logic state and a second logic state, and wherein the comparison circuit output is configured to generate a comparison circuit output signal comprising a comparison circuit output value representing one of the logic states,
• a linking unit which is configured to combine the logic states of the comparison circuit outputs by means of a logic AND operation to form a circuit output signal of the sensor circuit,
• wherein the sensor circuit is configured to scale the comparison circuit output value of at least a first one of the comparison circuits and to feed back the comparison circuit output value to the measurement input or the reference input of at least a second one of the comparison circuits, so that, when the comparison circuit output of the first comparison circuit transitions between the logic states, the difference between the measurement signal and the reference signal of the second comparison circuit is reduced or the sign of the difference between the measurement signal and the reference signal of the second comparison circuit is reversed.