Programmable controller with improved return processing capabili

Details Programmable controller with improved return processing capabili Programmable controller with improved return processing capabili

1984-01-18

1987-06-09

Eng, David Y.

Boots, shoes, and leggings

G06F 1300

Patent

active

046725733

ABSTRACT:
A programmable controller is provided for controlling, e.g., external devices according to a given control cycle. A non-volatile user program memory stores a user program including a power-off processing program. A non-volatile input/output memory stores (1) external input data corresponding to an input circuit which receives external input signals and an output circuit and (2) internal input/output data for internal operation. A non-volatile flag memory stores flags for instructing processing contents at restoration of power-off. A flag setting unit is provided for setting the flag to the flag memory at a stage as determined by the user program. When power restoration occurs, first a determination is made as to whether a state maintain flag as been set. If the state maintain flag has been set, an output inhibit circuit is actuated. Thus, while data in the input/output memory is maintained without modification, the output inhibit circuit causes data not to be delivered to the output circuit. After execution of this routine, control is then performed in accordance with the data which existed immediately prior to occurrence of power-off. However, if the state maintain flag has not been set, the input/output memory is cleared, and after execution of this routine, control is then performed based on the initial data of the processing operation.

REFERENCES:
patent: 4196476 (1980-04-01), Steiner
patent: 4313160 (1982-01-01), Kaufman et al.
patent: 4453215 (1984-06-01), Reid
patent: 4458306 (1984-07-01), McAnlis et al.
patent: 4486826 (1984-12-01), Wolff et al.

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