Digital logical sequence controller

Details Digital logical sequence controller Digital logical sequence controller

1974-05-06

1976-03-16

Malzahn, David H.

Communications: electrical

Digital comparator systems

G05B 1101, G06F 900

Patent

active

039449874

ABSTRACT:
A sequence controller of the digital logical circuit type, comprising a sequence program part and a processing circuit, wherein the desired sequence instruction is read from the sequence program part, and the sequence is processed and controlled by the processing circuit. A certain definite level is set at a branch point in an equivalent sequential circuit according to the path along which a signal of the sequential circuit is transmitted. This level and the on-off state of the branch point are stored in a memory. The given data are processed and controlled through the sequence program part and the memory.

REFERENCES:
patent: 3686639 (1972-08-01), Fletcher
patent: 3753243 (1973-08-01), Rickeffs, Jr. et al.
patent: 3806714 (1974-04-01), Otsuka et al.
patent: 3810118 (1974-05-01), Kiffmeyer
patent: 3849765 (1974-11-01), Hamano
G. Lapidus, "Programmable Logic Controllers--Painless Programming to Replace the Relay Bank", Control Engineering, Apr. 1971, pp. 49-60.
N. Andreiev, "Programmable Logic Controllers--An Update", Control Engineering, Sept. 1972, pp. 45-47.

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