System and method for controlling redundant communication links in networked safety systems
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United States of America Patent
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May 22, 2007
Grant Date -
Aug 5, 2004
app pub date -
Dec 31, 2002
filing date -
Dec 31, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system, apparatus, and method for maintaining communication integrity in a safety system. A link integrity signal indicative of any short circuits or open circuits in a first communication link is communicated. A control signal having characteristics corresponding to the communication state of the first communication link is generated. A communication link switch is coupled to the first communication link and one or more second communication links; this link switch being controlled in response to the control signal characteristics. If the control signal characteristics indicate that a failure affecting any one or more signals associated with the first communication link has occurred, the connection is switched to one of the second communication links.
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