Patent ID: 9134728
Filing Date: 2015-09-15
Classification: G05B

Abstract:
1. A method for loss-free processing of process measured values, implemented by a process control system of a technical installation comprising: measuring process values from the technical installation; recording the process measured values as raw data using a recording unit; generating archivable data from the raw data of a given process measured value after a physical unit and a measuring range have been assigned to the given process measured value; determining whether the archivable data exceeds a predefined tolerance band and selecting the archivable data within the predefined tolerance band using an archiving function; storing the selected archivable data in a raw data format in a history server, wherein indices of the archivable raw data are stored as first entries in a first directory and differences among the archivable raw data are stored as second entries in a second directory, and wherein a time resolution of each raw data value is stored as first entries in a third directory and differences among the time resolutions are stored as second entries in a fourth directory; selecting one of the first and second directories as a selected directory having a fewest number of values among the two directories; selecting one of the third directory and the fourth directory having smaller time differences among the entries; compressing the data in the selected directory among the third and fourth directories in the raw data format continuously based on a time delay with respect to storage of the selected data in the history server, wherein a coding module in the history server performs the compression, and, wherein the time delay is set individually for individual process measured values or for groups or classes of process measured values; decompressing the compressed data, following a request from the process control system, using a decoding module provided by the history server; and transmitting the decompressed data provided by the decoding module and further available data in the raw data format to a display module for further processing, wherein the time delay for compressing the selected data is determined automatically as an optimum time delay based on access statistics of the process measured values.