Plant information management system

Details Plant information management system Plant information management system

2006-12-26

2006-12-26

Le, Debbie M. (Department: 2168)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C700S108000

Reexamination Certificate

active

07155450

ABSTRACT:
In a plant information management system (PIMS,1), data received from a process device (PCC,10) is cached by a data logger (2) in blocks. A database controller (4) receives, for each data event, a time string, a value string, and a data quality indicator. The quality indicator is stored by exception only (if “bad”). MSBs of the time string are encoded in a hierarchical database structure of item (process device)—year—day levels. LSBs of the time string, the value string, and quality exceptions are stored as event objects in linked list arrays referenced to a day array object. There is thus no need for an index and the structure provides hierarchical compression.

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