1. A process device coupled to a process control loop, comprising: a process signal input providing a process signal related to a process; memory containing a trained parameter representative of statistical function of an observed process signal and a rule; computing circuitry calculating a current parameter representative of a statistical function of the process signal and operating on the current parameter and the trained parameter based upon the rule to thereby recognize a pattern in the process signal associated with a failure event and responsively providing a failure event output in response to an event in the process detected based upon the operation; and output circuitry outputting the failure event output.