Sequence controller

Details Sequence controller Sequence controller

1983-02-07

1990-11-06

Zache, Raulfe B.

Boots, shoes, and leggings

3649269, 364949, 364140, G06F 900, G05B 1101

Patent

active

049691198

ABSTRACT:
In processing a sequence program for a normally closed contact, the input signal is logically inverted before processing, inversion not being required for a normally open contact. A logical inversion circuit is provided for logically inverting an input signal corresponding to the normally closed contact designation of the sequence program before the input signal is fed to a central processing unit, so that inversion processing in the central processing unit can be dispensed with and the operation speed can be increased. The application of a logical inversion signal to the logical inversion circuit can readily be effected by utilizing an address line of the central processing unit.

REFERENCES:
patent: 3832696 (1974-08-01), Nakao
patent: 3944987 (1976-03-01), Koyanagi et al.
patent: 3996565 (1976-12-01), Nakao
patent: 4021783 (1977-05-01), Highberger
patent: 4038533 (1977-07-01), Dummermuth
patent: 4048622 (1977-09-01), Yomogida
patent: 4107785 (1978-08-01), Seipp
patent: 4144562 (1979-03-01), Cooper
patent: 4282584 (1981-08-01), Brown
patent: 4302820 (1981-11-01), Struger et al.
patent: 4303990 (1981-12-01), Seipp
patent: 4415965 (1983-11-01), Imazeki et al.
Paul Lamar, "Circuit Simplifies Industrial Control", EDN, vol. 26, No. 4, Feb. 1981, pp. 155-156.

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