Interface for providing multiple computer systems access to...

G - Physics – 06 – F

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G06F 13/36 (2006.01) G05B 15/02 (2006.01) G05B 19/042 (2006.01) G06F 15/16 (2006.01) G06F 15/46 (1990.01)

Patent

CA 2093469

INTERFACE FOR PROVIDING MULTIPLE COMPUTER SYSTEMS ACCESS TO A PROCESS CONTROL SYSTEM ABSTRACT An interface apparatus which provides communications between a process control system and a computer system comprises a first processor, a second processor, and a memory unit divided into two portions, memory A and memory B. The first processor is of a type compatible with processors utilized in modules of the process control system, the modules being connected to a first network and communicating to each other via a first protocol. The second processor is of a type compatible with processors utilized by computers of the computer system, the computers being connected to a second network and communicating to each other via a second protocol. The first processor is connected to the first network and appears like a module to all the other modules. Likewise, the second processor is connected to the second network and appears like a computer to all the other computers connected to the second network. A computer communicates to the process control system by communicating to the interface, the second processor of the interface accepting the message and storing it in memory B portion. The first processor obtains messages from memory B, communicates with the appropriate module, and stores the obtained reply in memory A portion. The second processor looks for the reply in memory portion A, and when available, fetches the reply and transmits it to the requesting computer, thereby effecting communications between the systems.

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