Patent ID: 6487462
Filing Date: 2002-11-26
Classification: G05B

Abstract:
A process controller with an automatic selective process data logger capable of instant replay comprising:(a) a process controller receiving process data from sensors; (b) a non-volatile memory; (c) a time keeping means; (d) one or more microprocessors programmed, configured and connected to determine whether the present process data differs significantly from the last previous data recorded in said non-volatile memory; (e) one or more microprocessors also programmed, configured and connected to automatically store in said non-volatile memory the then current time and process data when said data differs significantly from the last data previously stored in said non-volatile memory; (f) one or more microprocessors also programmed, configured and connected to replay process data stored in said non-volatile memory; (g) a display means to show replayed data; and (h) an operator control means to control process data replay.