Boots – shoes – and leggings
Patent
1987-02-04
1989-10-03
Chan, Eddie P.
Boots, shoes, and leggings
364268, 3642683, 3642684, 3642697, 364244, 3642448, G06F 1500
Patent
active
048721069
ABSTRACT:
In an industrial process control system, in which a plurality of remote stations interconnected by a communications link each control and manage a plurality of input/output devices, each remote station comprises a primary data processor and a back-up data processor. The primary data processor normally exercises control over and manages the input/output devices, but, should the primary data processor fail, the back-up processor takes over management and control of the input/output devices. Periodically, the primary data processor transfers status data relating to its operation in the control of the input/output devices to the back-up data processor via a dual ported memory connected between the two processors. The back-up processor maintains a record of the status data and updates its record of the status data with the periodically transferred copy of the status data. Prior to updating its record of the status data, the back-up processor does a validity check on the transferred copy of the status data and updates its record of the status data if, and only if, the transferred copy of the status data is determined to be valid.
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Chan Eddie P.
Fairbanks Jonathan C.
New Forney Corp.
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