Redundant industrial controller storing module and chassis level redundancy status
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United States of America Patent
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-
Dec 7, 1999
Grant Date -
N/A
app pub date -
Jun 18, 1997
filing date -
Jun 18, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A redundant controller employs two controller chassis having replaceable functional modules interconnected electrically within the chassis. System back up modules in the chassis coordinate the switching of control from a primary to a secondary chassis according to chassis redundancy state information of the chassis stored in the backup modules and module redundancy state information stored in the modules unique to the modules.
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