| 摘要 |
PROBLEM TO BE SOLVED: To transfer data in real time by periodically outputting data acquired from a device to a network at the time of acquiring a transfer request outputted to the network from middleware. SOLUTION: When an OPC client 15 receives a transfer request of data to a device 14, an OPC server 16 transmits the received transfer request to middleware 17. The middleware 17 transmits the transfer request from the server 16 to middleware 18 in a programmable logical controller(PLC) 12 through a network 13 and also acquires data that accompanies the transfer request and is transferred from the network 13. When the middleware 18 receives the transfer request from the middleware 17, it periodically transmits data acquired from the device 14 to the middleware 17 through the network 13. Thus, it is possible to transfer data in an operator station 11 and the data from the device 14 in real time. |
