Operational technology is not IT in a hard hat. The decisions that keep a refinery running, a substation safe, or a fab fab-ing have their own rules — availability over confidentiality, deterministic processes over agile updates, and a 25-year asset lifecycle instead of a 3-year refresh cycle.
This first lesson sets the frame for everything else in the course: why the threat model is different, why the controls are different, and why an IT-trained engineer's first instinct is usually the wrong one.
The remaining lessons in Chapter 1 cover manual vs. automated process, sensors and actuators, logic control, tags and setpoints, the data historian, and safety instrumented systems. By the end of Part 1, you'll be comfortable with DCS, SCADA, PLCs, RTUs, the Purdue model, and the IT-vs-OT split — the vocabulary you need before anything else lands.
Then Parts 2–4 take you progressively into protocols, sector-specific stacks (substations, oil & gas, BMS), and the cybersecurity practices that hold up under real-world pressure: IEC 62443, risk assessment, OT NIDS, secure remote access, and zero trust adapted for plant networks.
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