Omron Corporation

Toshiaki Sasamori

Jintaro Deki

Naoaki Ikeno

Chiaki Koshiro

Takuya Shimomura

Masuhisa Hirata

Shigeru Hitomi

A network system for carrying out communication between a control station and a plurality of devices connected to a network. The communication includes data communication which requires real-time attributes and message communication which does not require real-time attributes. The data communication includes a first data communication, and a second data communication. The system includes a plurality of transmission queues for temporarily storing transmission data provided in the control station, wherein one of the queues holds transmission data for the second communication. After the first data communication is carried out in accordance with a predetermined cycle time, an appropriate switching between the message communication and the second communication is carried out in the remaining time of the cycle time to complete one cycle, whereafter the cycle is repeatedly carried out.

Control station, apparatus and network system

A logical name of shared data is defined. A network system comprises a communication portion for exchanges of data with other control apparatuses; a link memory () for storing data shared through the network; an indirect reference table () for storing logical names and the pointers used to access data stored in the link memory; and a database () of variables in which logical names are associated with memory addresses in the indirect reference table storing the pointers of the logical names. A control execution portion () accesses the link memory through the indirect reference table based on a logical name so that there is no need to know the specific memory location. Specifically, the user program contains logical names and no addresses (pointers) storing data.

Network system, control method, control apparatus, and multiprocessor

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Kyoto, Japan

Toshiaki Sasamori