Programmable controller and method of operation thereof

Details Programmable controller and method of operation thereof Programmable controller and method of operation thereof

1994-04-01

1997-04-08

Harvey, Jack B.

395828, 395884, G06F 1300

Patent

active

056197349

ABSTRACT:
A programmable controller apparatus, and a method for operating a programmable controller apparatus, which does not require a sequence program to initialize the device memory at the start of operation of the programmable controller apparatus. Further, the apparatus and method both allow the contents of the device memory of the programmable controller to be changed at a specified time, during a simulation operation, or when data at a predetermined address of the device memory represents a predetermined value. The programmable controller operates based on the contents of the device memory, and comprises a second memory for sequentially storing data including address data indicating a first address of the device memory and write data to be written to a predetermined number of addresses of the device memory beginning at the first address, and a memory changing device for changing the contents of the device memory in accordance with the data stored in the second memory. The memory changing device changes the contents of the device memory when operation of the programmable controller begins, at a predetermined time, or when a predetermined address of the device memory represents a predetermined value.

REFERENCES:
patent: 3976980 (1976-08-01), Hertz
patent: 4245300 (1981-01-01), Kaufman et al.
patent: 4972365 (1990-11-01), Dodds et al.
patent: 5418729 (1995-05-01), Holmes et al.
patent: 5488409 (1996-01-01), Yuen et al.

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