| 摘要 |
A network unit in a programmable controller of a building block mutually connects an information system network and a control system network. The network unit includes transfer analyzing units that judge to which of interface units received data received from the information system network and the control system network should be allocated. Moreover, received data that needs to be transferred is converted into predetermined data by conversion processing units included in the networks and output to the information system network or the control system network without being transmitted to a system bus.
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