Microprocessor-based programmable logic controller

Details Microprocessor-based programmable logic controller Microprocessor-based programmable logic controller

1978-03-16

1981-05-26

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 922, G06F 1300

Patent

active

042701848

ABSTRACT:
A programmable logic controller with an input-output device for applying data indicating the status of external devices and controlling the devices. A main memory is provided for storing universal instructions and sequence instructions. An arithmetic operation control unit connected to the main memory repeatedly executes the universal and sequence instructions. A switch is provided for connecting the arithmetic operation control unit to a first read-only memory device for storing microinstructions used for executing universal instructions and to a second read-only memory device for storing microprograms used for executing sequence instructions. The switch provides arithmetic control over the sequence instructions microprogram and the universal instructions microprogram. The arithmetic operation control unit and a sequence control unit together execute sequence instructions in response from the microprogram instructions stored in the second read-only memory device.

REFERENCES:
patent: 3827030 (1974-07-01), Seipp
patent: 3875564 (1975-04-01), Thuruoka et al.
patent: 4078259 (1978-03-01), Soulsby et al.
patent: 4092730 (1978-05-01), Burkett et al.
patent: 4093998 (1978-06-01), Miller
patent: 4107785 (1978-08-01), Seipp
patent: 4118792 (1978-10-01), Struger et al.
patent: 4138718 (1979-02-01), Toke et al.
Kompass, "Multiprocessor Concept Leads to PLC Hierarchies," in Control Engineering, Jan. 1976, pp. 46-47.

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