METHOD FOR DIAGNOSING A FUNCTIONALITY USING DISCRETE VALUES OR DISCRETE CLASSES OF VALUES ON THE INPUT OR OUTPUT SIDE

摘要

The invention relates to a method for diagnosing functionality which has an input or output signal with discrete values or discrete classes of values which are observable variables of a diagnostic functionality, wherein the signal (13) to be diagnosed is the input or output signal which has the values or the classes of values of a cardinality N, wherein N error counters are provided, and the method comprises the following steps: providing a sum signal (18) from the sum of the signals from the error counters (16, 17); if the value or a class of values is erroneous, increasing the signal of the error counter (16, 17) assigned to the erroneous value or the erroneous class; if the value or the class is correct, decreasing the signal of the error counter (16, 17) assigned to the value or the class; if the sum signal (18) exceeds a predefined limiting value (33), outputting an error message from the functionality.