Sequence controller

Details Sequence controller Sequence controller

1985-06-10

1988-06-21

Williams, Jr., Archie E.

Boots, shoes, and leggings

G06F 1546

Patent

active

047529091

ABSTRACT:
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.

REFERENCES:
patent: 4178634 (1979-12-01), Bartlett
patent: 4249248 (1981-02-01), Yomogida et al.
patent: 4316260 (1982-02-01), Hideshima et al.
Patent Abstracts of Japan, vol. 8, No. 86 (P-269)[1523], Apr. 19, 1984 (Masaya Murata).

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