Hitachi, Ltd.

Ryouichi Abe

Takeshi Abe

Masato Shibayama

Naohiro Kurokawa

Tatsuo Fujiwara

Tatsuo Hujiwara

Nobuyuki Kojima

Tsukasa Saiki

Nobuyuki Kajima

Programmable controller

In a sequence controller, a sequence program store device includes an instruction store unit for writing a specific instruction dedicated to the sequential control and a plurality of latch circuits respectively associated with the outputs from an output unit. The latch circuits are controlled by a signal from a processing device which periodically calls and processes the program from the store device and executes a specific output processing when external input signals satisfy a logical state set by the program; the latch circuits, if a transition condition of the program is satisfied when the specific instruction is processed, retain an output state of the output unit until the next transition condition is satisfied, and release the state retaining the output state before the next transition condition is satisfied.

Sequence controller

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Sibata, Japan

Ryouichi Abe