| 摘要 |
PURPOSE:To attain the unification of accurate time by allowing a system having a standard clock to stop tentatively the communication of other plural systems, transmitting a time of the standard clock and starting the communication of each system again after the time setting is finished. CONSTITUTION:The system 1 having a standard clock 1a stops the communication in the local area network tentatively and transmits the time obtained from the standard clock 1a to all systems 31-3n in the local area network, then the time is unified accurately without being affected by the quantity of communication in the local area network. Moreover, when it is required to compare the operation history of each system due to a fault in the local area network or a fault analysis, etc., the comparison between systems is attained easily and accurately by adjusting properly the time setting in the local area network. |
