Boots – shoes – and leggings
Patent
1994-09-26
1996-04-16
Ruggiero, Joseph
Boots, shoes, and leggings
39518205, 39518509, G06F 1900, G06F 1116
Patent
active
055089100
ABSTRACT:
In a distributed logic control system, two duplicate analog I/O boards are provided to provide redundancy for the analog I/O boards. The analog I/O boards serve the function of applying analog output signals corresponding to received digital signals from a data processor to analog signal responsive units. Each analog I/O board has a microprocessor and two digital-to-analog converters and a analog-to-digital converter. The microcomputer determines whether the analog output signals generated by the digital-to-analog converters are within limits and, if they are not, it generates a fail signal applied to a programmable array logic circuit. Each analog I/O board includes a watch dog timer to indicate the sanity of the analog I/O board. The programmable array logic circuits respond to the failure conditions indicated by the watch dog timer and the microcomputer to select one of the analog I/O boards to be the operating analog I/O board to provide analog signals to analog signal responsive units.
REFERENCES:
patent: 4600870 (1986-07-01), Martin
patent: 4639852 (1987-01-01), Motomiya
patent: 4868826 (1989-09-01), Smith et al.
patent: 5249140 (1993-09-01), Kesler
patent: 5285381 (1994-02-01), Iskarous et al.
Forney International, Inc.
Ruggiero Joseph
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