Trace frozen OPC tags in ABB 800xA and GE PACSystems by checking source values, item paths, timestamps, scan groups, deadband, and controller communication load.
Match the protocol to the accuracy your data actually needs, then stop the drift that scrambles event order. A practical guide to PTP, IRIG-B, NTP, and SNTP time synchronization for GE PACSystems controllers and Bently Nevada 3500 machinery protection systems.
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