Boots – shoes – and leggings
Patent
1990-09-26
1992-12-01
Nguyen, Long T.
Boots, shoes, and leggings
395575, 371 91, G05B 902, G06F 1120
Patent
active
051684438
ABSTRACT:
A primary (first) and secondary (second) slave (IOP) collect input pulses from a field device, each independently maintaining an interim total number of pulses. A master controller executes a method for maintaining the total number of pulses for the entire process by requesting the interim total number of pulses, a process variable, and a flag from the first IOP by the controller. If the flag indicates no anomaly in the interim total number of pulses or the process variable, the master controller determines a new interim total number of pulse and the process variable since the previous request. The new interim total number of pulses and the process variable is saved in a temporary holding area, such that upon a failover of the first IOP, differences in the interim total number of pulses transmitted by the second IOP can be handled without causing an error in the total number of pulses for the entire process being maintained by the master controller.
REFERENCES:
patent: 4133027 (1979-01-01), Hosan
patent: 4141066 (1979-02-01), Keiles
patent: 4607256 (1986-08-01), Hanzel
patent: 4958270 (1990-09-01), McLaughlin et al.
patent: 4959768 (1990-09-01), Gerhart
Banerjee Indra
McLaughlin Paul F.
Honeywell Inc.
Medved A.
Nguyen Long T.
Sapelli A. A.
Trammell Jim
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