This is the engineering summary of an open reference architecture. The paper, its object model as JSON and the model register are free to reuse under CC BY 4.0: https://codeatoms.ai/steam-turbine-condition-monitoring-pakistan/ . DOI 10.5281/zenodo.23365092 . The operator is described by class, never by name.

A combined cycle plant in Pakistan is rehabilitating a steam turbine and installing a new 280 MW, 20 kV hydrogen-cooled generator. The protection layer already trips the unit when bearing vibration reaches Zone C. The question the design answers is the one before the trip: can the shift operator see a developing excursion, with a prescribed action, while the bearing housing is still drifting up from its nominal 2.3 mm/s RMS?

1. Read the DCS, never write to it

The DCS is read through a hardware one-way egress device into a DMZ OPC UA collector. The platform gets process, alarm and vibration context and has no path back into the control network, so the existing trip philosophy is untouched.…