| 摘要 |
PROBLEM TO BE SOLVED: To provide a field bus communication system that recovers data that a subscriber failed to receive without letting a publisher perform generation management of data for an instrumentation system using field bus communication system. SOLUTION: The field bus communication system 1 includes the publisher 10, the subscriber 20, and a cache server 40; and the subscriber 20 includes a processing unit 22 which sends a transmission request for data, and the cache server 40 includes a transmission/reception unit 41 which can be connected to a field bus F, a control data storage area 47 which stores data, and a control unit 42 which reads requested data on field equipment out of the control data storage area 47 and transmits the data to the subscriber 20 when receiving the transmission request from the subscriber 20. COPYRIGHT: (C)2010,JPO&INPIT
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