Method and apparatus for providing redundant I/O adapters in machine and process controllers
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United States of America Patent
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Sep 29, 2009
Grant Date -
Jan 18, 2007
app pub date -
Jun 27, 2005
filing date -
Jun 27, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and apparatus for redundancy in machine or process control systems provide redundant communication adapters located with the groups of I/O modules, so that if the first communication adapter faults or becomes unavailable, a second communication adapter will perform all of the necessary functions of the first adapter. The adapters are connected to a multiplexing module for communicating input data from the I/O modules to the communication adapters, for exchanging initialization data with the first communication adapter and the second communication adapter to initialize the redundant mode of operation and for monitoring communication of the first communication adapter and the second communication adapter on the network to start up the second adapter as the primary adapter for communicating both input data and output data with the I/O modules.
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