Hitachi, Ltd.

Nissan Motor Company Limited

Kunio Yamanaka

Masaoki Takaki

Kazuyoshi Asada

Haruo Koyanagi

Keiji Hideshima

Hirokazu Sawano

Shoichi Masui

Isao Yasuda

Hiroharu Suda

Mikihiko Oonari

A programming equipment is used for automatically constructing programs by selecting and interconnecting a plurality of previously prepared unit programs in accordance with instructions by an operator. A screen of a display unit is divided into a plurality of partial display areas. A memory has a plurality of unit storage areas, one for each partial display area, for storing unit program names and data flow specifications. The information of the respective area is displayed in block form on the display unit so that the operator can readily construct a process data flow by operating the input device while watching the display unit. The programming equipment reads out the area information from the areas in a predetermined sequence, and selects and interconnects the unit programs to construct the program corresponding to the process data flow.

Interactive equipment for computer programming by linkage of labeled

A programmable sequence controller is provided with a display signal processor for preparing and correcting a sequence program in combination with a CRT (or cathode ray tube) display device. The signal processor simply effects signal processing of branch points and composition points in case where a so-called 'ladder diagram' constituting the sequence diagram with relay symbols is prepared and displayed. Branch information is stored in an FIFO (or first in first out) register. The branch information is sequentially received and stored, and the information thus stored is read out in the order of storage, thus preparing the ladder diagram. There are provided a register for instructing the FI operation and a register for instructing the FO operation. The sequence display controller is applicable to the cases where a new ladder diagram is to be prepared, the diagram once prepared is corrected, and the operation is checked.

Sequence display controlling method and controller

A sequence control system suitable for checking the operation of an information processor includes a process I/O unit for receiving input data from process inputs and providing output data to process outputs; a sequence processing unit for calculating data at the process outputs by performing sequence operations according to the sequence programs stored in a sequence program memory on the basis of the data at the process inputs; a buffer memory provided between the process I/O unit and the sequence processing unit for storing both the process input data from the process I/O unit and the output data from the sequence processing unit; a control arrangement for setting the input data to the buffer memory and for allowing access to a selected sequence program according to manually set input information; a display for displaying the selected sequence program accessed through the control arrangement; and a switch for interrupting the transfer of I/O data between the process I/O unit and the buffer memory. The sequence processing unit determines the output data on the basis of the input data stored in the buffer memory and applies the output data to the buffer memory. The control arrangement, in response to the manually set input information, causes the associated sequence program to be read from the sequence program memory and then the data of the inputs and outputs associated with the sequence program to be read from the buffer memory thereby to indicate them on the display.

Sequence control system

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Hitachi, Japan

Kunio Yamanaka