Method for the safe acquisition of a plurality of analog input signals, analog input circuit, as well as measuring sensor and a measuring transducer analog input circuit such.

摘要

Method for the safe acquisition of a plurality of analog input signals (S1-S3), which, using two A / D converters (2, 3) are converted into digital values ​​of individual measurement (D1-D3), wherein a first average measurement cycle (M1) with a total amount (ZG) of measurement intervals (T) is predetermined by a superordinate control unit (6), where A / D converters (2, 3) can be switched by one of multiplexers (4, 5) which can be controlled by the control unit (6) in at least part of the input signals (S1-S3), wherein a first input signal (S1) is acquired by the first converter a / D (2), respectively within the first measurement averaging (M1) cycle by a first amount (Z1) of measurement intervals (T) that preferably corresponds to the total number (ZG) and is cumulatively averaged by the unit control (6) to form a first measured value (MW1), wherein a sec unda input signal (S2) is acquired by the second A / D converter (3) in an amount (Z2) under measurement intervals (T) compared to the first amount (Z1) and is averaged cumulatively to form a second measured value (MW2), wherein the first input signal (S1) is acquired by the second a / D converter (3) in a third amount (Z3) of measurement intervals (T), preferably in only one measurement interval (T) as at least one single measured value (D1 '') and wherein a message (M) is emitted when a deviation of at least one single measured value (D1 ') from the individual measured value (D1 ) acquired synchronously by the first a / D converter (2) or from the first measured value (MW1) exceeds a maximum allowable deviation value.