A network data server apparatus is connected to a plurality units of PLC 3.sub.1 to 3.sub.n 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...http://www.google.fr/patents/US5815659?utm_source=gb-gplus-shareBrevet US5815659 - Network data server for use with programmable logic controllers and programmable logic controller system formed using such network data servers
Network data server for use with programmable logic controllers and ...
