Patent ID: 6999901
Filing Date: 2006-02-14
Classification: G06F

Abstract:
1. In an embedded microcontroller based control system reading field parameters and keeping a historical database of the field parameters in a memory device, a method of storing historical data comprising: a) grouping a first parameter and a second parameter into a first segment; b) writing a data value for the first parameter and a data value for the second parameter to the historical database; c) writing a first segment time-stamp associated with both the data values for the first and second parameters; d) grouping a third parameter and a fourth parameter into a second segment; e) writing a data value for the third parameter and a data value for the fourth parameter to the historical database; f) writing a second segment time-stamp associated with both the data values for the third and fourth parameters; g) repeating steps b) and c) at a first sample rate; and h) repeating steps e) and f) at a second sample rate different than the first sample rate.