Efficient architecture for interfacing redundant devices to a distributed control system
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United States of America Patent
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Jan 25, 2011
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app pub date -
Jun 27, 2008
filing date -
Apr 16, 2008
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Abstract
A system and method for interfacing redundant devices to a distributed control system, includes a first and second redundant field bus modules communicably coupled to the distributed control system and to one another via Ethernet switches. A pair of redundant field devices are coupled to the Ethernet switches, one FD having a floating IP address. The FBMs adopt respective roles as master FBM and tracker FBM, so that the master FBM is configured to capture data from the one FD using the floating IP address, and to pass any data changes periodically to the tracker FBM, through the Ethernet switches. The master FBM is configured to point to the other field device in the event the other field device has assumed the floating IP address. The FBMs are configured to switch roles in the event communication is disrupted between the master FBM and the FD having the floating IP address.
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