A device for diagnosing operation of an industrial process control or
monitoring system includes an input configured to receive an input
related to a process signal. A first statistical parameter module
provides a first statistical parameter output related to a statistical
parameter of the process signal. A filter provides a filter output
related to a filtered value of the process signal. A second statistical
parameter module provides a second statistical parameter output related
to a statistical parameter of the filter output. A diagnostic module
diagnoses operation of the industrial process based upon the first and
second statistical parameters.