The method involves determining a value of a time base after the expiry of a time period of specific length. Another value of another time base is determined after the expiry of the time period of similar length. A deviation between the former and the latter values is determined. A fault action is obtained when the deviation is below a pre-determined or preset threshold. Independent claims are also included for the following: (1) a data processing device; (2) a program element for verifying a data processing device on the suitability for implementation of fail-safe automation processes; and (3) a computer readable storage medium.