Boots – shoes – and leggings
Patent
1997-05-07
1999-06-15
Grant, William
Boots, shoes, and leggings
364146, 371 11, 395575, 395600, G05B 1101, G11C 2900, G01R 3128, G06F 700
Patent
active
059128143
ABSTRACT:
An industrial control system employs a primary and secondary controller each having a processor and at least one I/O data table. Updating of the secondary processor's I/O data table is performed prior to the same data being transmitted to the controlled process. This eliminates possible retrogressive control at the time of switch-over of control from the primary industrial controller to the secondary industrial controller. Additional I/O data tables may be provided in each of the primary and secondary industrial controllers. In the case of the secondary industrial controller, this duplicate I/O data table temporarily holds data until the transmission is complete preventing the partial update of the working I/O data table of the secondary industrial controller. The duplicate I/O data table in the primary industrial controller allows simultaneous outputting of the I/O data transmitted to the controlled process without corruption while the user program of the primary industrial controller resumes execution.
REFERENCES:
patent: 4377000 (1983-03-01), Staab
patent: 5392424 (1995-02-01), Cook
patent: 5564049 (1996-10-01), Schmidt
patent: 5619409 (1997-04-01), Schultz et al.
Allen-Bradley Company LLC
Baumgardner Carolyn T.
Baxter Keith M.
Grant William
Horn John J.
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