Methods and apparatus for maintaining a programmable logic control revision history
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United States of America Patent
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Mar 2, 2004
Grant Date -
N/A
app pub date -
Jan 19, 1999
filing date -
Apr 17, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Methods and apparatus for maintaining a PLC revision history are described. In one embodiment, the PLC creates and maintains a revision history log that provides information related to changes made to the PLC user program and/or the PLC configuration. If a change is detected, information regarding the change is gathered and stored in the history log. The history log maintains a record of the revisions made to the PLC. If the history log becomes full, the oldest revision entry is deleted and the latest change is incorporated into the history log.
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