Patent infringement: A system and method to record and track interactions with an industrial control system such as a PLC. The invention provided a realtime audit function for changes to an operating control program and dataset. The audit capability can be applied to quality control and other production verification requirements such as those of Six Sigma, LEAN manufacturing, and FDA regulation 21 CFR Part 11.
The invention included monitoring over a network as well as via directly-interfaced connections between the controller and the source of modification.
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