| 摘要 |
PROBLEM TO BE SOLVED: To attain a time reduction of completing all upgrading by simultaneously performing upgrading on a plurality of data processing devices and a plurality of controllers. SOLUTION: Performing upgrading simultaneously by connecting a maintenance device 1 to a network NWL and executing an upgrading program stored in the maintenance device 1 by selecting a plurality of data processing devices 2A, 2B,...2N, and controllers 3A, 3B,...3N of the data processing devices connected to the network.
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