Boots – shoes – and leggings
Patent
1989-09-07
1992-02-11
Smith, Jerry
Boots, shoes, and leggings
371 91, G06F 1120
Patent
active
050880217
ABSTRACT:
In a process control system, having at least one process control unit which includes redundant equivalent controllers to reduce the impact of failure of the controllers in the process control unit, a technique is provided to guarantee that interruption of either the active (primary) controller or the backup (secondary) controller will not adversely effect the storage of data signals or the execution of commands by the process control unit. In the present invention, an information message or packet sent to the process control unit and, hence, to the active controller is forwarded to the backup controller before a response in the form of acknowledgement message is returned to the device issuing the information message or packet. The information message or packet is therefore stored in the same order in both the active controller and the backup controller and is executed in the same order by either controller. This technique is particularly important in a process control network of a process control system to insure successful monitoring and control functions for the process.
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McLaughlin Paul F.
Mody Pankaj H.
Brown Thomas E.
Honeywell Inc.
Lenkszus D.
Medved A.
Sapelli A. A.
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