System, communication network and method for transmitting information
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United States of America Patent
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Issued Date -
Jul 28, 2005
app pub date -
Dec 13, 2004
filing date -
May 30, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a system comprising: a process control network (3) having process equipment (2) connected thereto for receiving, through the process control network, control commands and for transmitting messages. To enable a high-security-level system to be achieved, wherein the state of a process can be established from an external communication network, the process control network (3) is connected to an external communication network (5) via a one-way data transfer device (12). The external communication network has storage equipment (6 to 8, 13) connected thereto, configured to store at least some of the information contained in the messages to be transmitted from the process control network (3) to the external communication network (5).
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