Network data server apparatus and progtammable logic controller system

摘要

A network data server apparatus is connected to a plurality units of PLC 31 to 3n as well as to at least one unit of FA controller in a manner enabling bidirectional communications. Provided in the network data server apparatus are a memory for PLC enabling read/write of PLC data and a copy data list section with memory addresses from which data is copied and those at which data is copied described therein, and data copying is executed by a control means according to the memory addresses from which data is copied and those at which the data is copied.