PLC processor and PLC

Details PLC processor and PLC PLC processor and PLC

1991-02-25

1993-08-03

Chun, Debra A.

Boots, shoes, and leggings

364DIG2, 3649462, 364947, 364949, G06F 9305

Patent

active

052336972

ABSTRACT:
A PLC (programmable logic controller) processor which carries out logical operations. The processor comprises a logical operation unit (2) for executing a logical operation, a jump inhibition unit (3), a jump condition checking unit (4) for checking whether or not a jump can be carried out while omitting executions of subsequent instructions, and a jump instruction execution unit (5) for executing the jump instruction. When the result of the checking by the jump condition checking means (4) indicates that subsequent instructions need not be executed and the jump should be carried out, the jump instruction execution means executes the jump, whereby unnecessary instructions are not executed, thus the speed of the logical processing is increased.

REFERENCES:
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patent: 3996565 (1976-12-01), Nakao et al.
patent: 4162480 (1979-07-01), Berlekamp
patent: 4287559 (1981-09-01), Easley et al.
patent: 4390966 (1983-06-01), Kawashima et al.
patent: 4471461 (1984-09-01), Boone
patent: 4675843 (1987-06-01), Vautier
patent: 5053954 (1991-10-01), Miyoshi
Supplementary European Search Report for EP-88-90-1928, The Hague, Aug. 23, 1990.

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