A method for the secure detection of a plurality of analog input signals, analog transmitter as well as measuring sensor and the measuring transducer with such an analog input circuitry

摘要

The method according to the invention is for the reliable detection of a plurality of analog input signals (s1 - s3) is determined. The input signals (s1 - s4), by means of two a / d - converter (2, 3) into corresponding digital individual measured values (d1 - d3) reacted. It is a first measuring center position, the cycle (m1) with a predetermined total number (zg) of measured clock cycles (t) of a higher-level control unit (6) is predetermined. It is possible to use the a / d - converter (2, 3) by means of at least one of the control unit (6) controllable multiplexer (4, 5) to at least one part of the input signals (s1 - s3) are connected. It is in each case within the first measuring center position, the cycle (m1) a first input signal (s1) of the first a / d - converter (2) in a first preferably one of the total number (zg) corresponding number (z1) of measured clock cycles (t) and detected by the control unit (6) cumulative to a first measured value (mw1) averaged. It is a second input signal (s2) of the second a / d - converter (3) in a in comparison to the first number (z1) smaller number (z2) of measured clock cycles (t) is detected and cumulative to a second measured value (mw2) averaged. It is the first input signal (s1) of the second a / d - converter (3) in a third number (z3) of measured clock cycles (t), preferably in only a measurement clock cycle (t), as at least a further individual measured value (d1 '') is detected. It is a message (m) is emitted if a deviation of the at least one further individual measuring value (d1 '') of the synchronously from the first ..