| 摘要 |
PROBLEM TO BE SOLVED: To perform data sharing between networks with the avoidance of the occurrence of a transmission delay, in a control system having a plurality of networks and a control device connected by a network device.SOLUTION: The network device includes a transfer determination criterion table, determination means and data transfer means. The determination criterion table includes stored information indicative of whether a part or the whole of data, transmitted from each of the plurality of networks to the control device, is necessary to transfer to another network. The determination means, whenever receiving data transmitted from each network to the control device, refers to the transfer determination criterion table to determine whether or not a part or the whole thereof is necessary to transfer to the other network. The data transfer means transfers the part or the whole of the data, determined to be necessary to transfer by the determination means, to the transfer destination network, together with data transmitted from the control device.SELECTED DRAWING: Figure 3 |
