| 摘要 |
PURPOSE:To store a large amount of data in the same storing media by conpressing the data to be stored in an operational history data processor by using a data amount reducing process part without degrading data precision. CONSTITUTION:An operational history data processing device 2 receives the transfer data through a data receiving part 8, and at a day-unit file editing process part 9, the data is edited into a day-unit file for each input point, and it is stored in a day-unit file storing part 10. At the stage when the amount of data equivalent to one day is obtained, the data file stored in the day-unit file storing part 10 is processed for preservation by a preserving process part 11, however, before this process, a data amount reducing/converting process part 18 reduces a data table by using a data conversion expression which reduces a data table. When data is displayed by reading the data preserved in a data preserving media 12, the data which is read by a data reading part 15 in response to a read instruction is converted into restored data which includes an original data table by a data restoring/converting process part 19. |
