Hitachi, Ltd.

Nissan Motor Company Limited

Norio Murayama

Nagaharu Hamada

Kazuyoshi Asada

Toshitaka Hara

Haruo Koyanagi

Masaoki Takaki

Yukitaka Hayashi

Keiji Hideshima

Yoshiyuki Nihashi

Shuichi Senda

Novel method and system for controlling input/output in a process control wherein state signals of object processes to be controlled are applied to a CPU via a process input/output unit and operated in the CPU in accordance with a logic programmed and stored in advance, and results of the operation are delivered out to the object processes to control the same. A buffer memory is interposed between the CPU and the process input/output unit. While reception and delivery of data are performed between the CPU or processor unit and the buffer memory, fetching of the state signals of the object processes or delivery of the process controlling signals is performed between the buffer memory and the object processes, thereby attaining a high rate processing as viewed from the overall processing of the system.

Method and system for controlling input/output in process control

A data display control system for displaying respective data memorized in a plurality of refresh memories which is operable in various display modes including a selective picture display, a superimposed picture display and a shifting picture display. Individual data memorized in respective refresh memories contain each a display control bit adapted to determine whether or not the individual data are to be displayed on the screen. The data display control system reads out from the respective refresh memories a data information to be picture-displayed and only when the contents of a display control bit contained in the data information designate a display, it converts this data information into a video signal for a picture display. The contents of the display control bit are changeable for individual data.

Data display control system with plural refresh memories

Growing community of inventors

Katsuta, Japan

Norio Murayama