The Separate Nervous System
{"body": "Faraday's read: the three-layer hierarchy is not an implementation detail — it is a statement about trust. The system is built so that the closer a layer sits to the physical plant, the less it depends on anything above it. Reflexes outrank the cortex. When you assess a facility, notice which decisions were pushed down into autonomous controllers and which were left hanging off a supervisor that can reboot. That distribution of authority tells you how the operators think about failure, and it is often more honest than anything in the design documents.", "position": 1}
Knowledge check
Why is the automation level deliberately designed to keep running its control loops when the management level fails?
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Because control must be more reliable than supervision. The management (supervisory) level can reboot, crash, or lose its network without endangering the facility, but the physical plant cannot stop cooling. By placing the actual feedback loops in autonomous controllers at the automation level, the design ensures that cooling and mechanical control continue — holding their existing setpoints — even when the supervisory brain goes dark. Reflexes are engineered to survive the loss of the cortex.