System controller and remote fault annunciator with cooperative storage, sharing, and presentation of fault data
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United States of America Patent
Stats
-
Jul 12, 1994
Grant Date -
N/A
app pub date -
Jun 3, 1992
filing date -
Jun 3, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An annunciator for the conduction status of individual switches wired into a series circuit records this status as status history at regular intervals in a memory. The status history is preferably recorded as individual entries having the identification number of an open switch along with a time stamp specifying the length of time which that switch has been open. The current entry is recorded in the memory and a new entry started each time the switch for which an entry in the memory is being created closes or a switch currently receiving power opens. A controller separate from the annunciator generates a request signal and provides a request time value to the annunciator specifying the time which has elapsed since the request condition was detected. The annunciator uses the request time value to determine the probable switch conduction status at the time of the request.
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Cited Art Landscape
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