| 摘要 |
PROBLEM TO BE SOLVED: To read and store all plant data from a plant. SOLUTION: A short term preservation server 4 fetches the plant data packaged by the package processing means 3 of an input device 2 and sent out onto a transmission line N1 and preserves them. Then, at the point of time at which one day elapses from fetching start, the data preserved until then are outputted to a long term preservation server 5. Thereafter, the inside of the server is reset and the preservation of the plant data for the next one day is started. The long term preservation server 5 inputs the plant data outputted from the short term preservation server 4 and preserves them for half a year or one year in a compressed state. Master side computers 6, 7 and 8 and backup side computers 13, 14 and 15 fetch a required data from the data preserved in the short term preservation server 4 and the long term preservation server 5. |
