Programmable controller unit and method of automatically...

Details Programmable controller unit and method of automatically... Programmable controller unit and method of automatically...

2007-07-10

2007-07-10

Iqbal, Nadeem (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

Reexamination Certificate

active

10745952

ABSTRACT:
A unit for a programmable controller includes a user program memory storing a user program to be read out for carrying out a calculation process and a backup memory storing data with the same contents as the user program stored in the user program memory. An abnormality detector is provided for detecting a memory abnormality by comparing user data stored in the user memory and the backup memory while the programmable controller is operated. If a memory abnormality is detected, a restoration device repairs the data at the position where the abnormality was detected with the data at the corresponding position of the backup memory and the cyclic operation of the programmable controller is continued thereafter.

REFERENCES:
patent: 4819154 (1989-04-01), Stiffler et al.
patent: 5933595 (1999-08-01), Iizuka et al.
patent: 6343366 (2002-01-01), Okitaka
patent: 6367042 (2002-04-01), Phan et al.
patent: 6651138 (2003-11-01), Lai et al.
patent: 6651202 (2003-11-01), Phan
patent: 02-059901 (1990-02-01), None
patent: 05-066936 (1993-03-01), None
patent: 08-087429 (1996-02-01), None
patent: 09-081381 (1997-03-01), None
patent: 09-204205 (1997-08-01), None
patent: 2001-209412 (2001-04-01), None
patent: 2002-358104 (2002-12-01), None
Patent Abstracts of Japan, Publication No. 11-143784,Display Device For Programmable Controller, Mochizuki Shingo et al., published on May 28, 1999.
Japan patent application No. 2003-421589, Examination Report dated Feb. 6, 2007.

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