Programmable sequence control method and devices

Details Programmable sequence control method and devices Programmable sequence control method and devices

1981-04-09

1984-04-03

Nusbaum, Mark E.

Boots, shoes, and leggings

364147, G06F 900

Patent

active

044411618

ABSTRACT:
A programmable sequence control apparatus including a first memory device for storing sequence program instructions, an input/output device, a relay ladder operation device for executing logic operations for a relay ladder circuit having n rows and m columns (wherein n and m are positive integers) in accordance with the program instructions, and a control device for delivering control signals to the relay ladder operation device, is so constructed that the control device includes a memory device for storing contact data and branch data for one column j (wherein j=1, 2, . . . , m) of the relay ladder circuit temporarily, the relay ladder operation device includes first and second registers of a series-in and parallel-out mode which receive and store the contact data and the branch data for the column j, respectively, a third register normally operable in a parallel-in and parallel-out mode, and a gate circuit including logic elements for executing logic operations for the column j based on the parallel delivered outputs of the first and second registers and a third register storing the operation results for the preceding column (j-1), and the relay ladder operation device repeats the aforementioned operation for all of the columns of the relay ladder circuit.

REFERENCES:
patent: 4021783 (1977-05-01), Highberger
patent: 4025902 (1977-05-01), Nakao et al.
patent: 4038533 (1977-07-01), Dummermuth et al.
patent: 4176403 (1979-11-01), Suzuki et al.
patent: 4200914 (1980-04-01), Kintner
patent: 4217658 (1980-08-01), Henry et al.
patent: 4227247 (1980-10-01), Kintner
patent: 4244034 (1981-01-01), Cherba
patent: 4249248 (1981-02-01), Yomogida et al.

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