Integrated circuit controller programmable with unidirectional-l

Details Integrated circuit controller programmable with unidirectional-l Integrated circuit controller programmable with unidirectional-l

1977-10-12

1980-10-07

Shaw, Gareth D.

Boots, shoes, and leggings

364104, G06F 906, G05B 1101

Patent

active

042272475

ABSTRACT:
A programmable controller that is programmed to simulate a ladder diagram and accepts input signals to control output devices in accordance with the ladder diagram program and comprising, in addition to a main memory that stores the program, a logic processor and input/output circuits, of a special wire number memory and a control coil memory for receiving, storing and making available to the processor the result of every logic function representing the current on-off status of each wire node and each control coil and associated contacts. This controller affords the maintenance of a complete current record of the changing status of the contacts and their interconnecting circuit nodes. This makes possible a particularly simple unidirectional-logic programming mode because the programmer does not have to keep track of which logic operations must be temporarily stored. This storage affords a powerful monitoring means in that signal tracing can be accomplished by merely calling up predetermined wire numbers from the special wire number memory and displaying the status thereof, or calling up predetermined input devices or control coils to view the status thereof. Moreover, for maintenance purposes, this architecture provides a selector switch and logic circuitry whereby a predetermined wire node may be manually forced "on" or "off" for maintenance purposes or the like.

REFERENCES:
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patent: 3940742 (1976-02-01), Hudspeth et al.
patent: 3944987 (1976-03-01), Koyanagi et al.
patent: 3953834 (1976-04-01), Burkett et al.
patent: 3953834 (1976-04-01), Burkett et al.
patent: 3964026 (1976-06-01), Yamauchi et al.
patent: 3975622 (1976-08-01), Horn et al.
patent: 4021783 (1977-05-01), Highberger
patent: 4051326 (1977-09-01), Badagnani et al.
patent: 4078259 (1978-03-01), Soulsby et al.

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