Control-Loop Stability Margin

CT phase/gain margin tracking: stable → marginal → unstable as a closed loop's margins erode (sensor lag, plant drift). Catches oscillation before it runs away.

Category	Control Systems
Template ID	control-loop-stability
Definition	control_loop_stability v1.0
States	4 (initial: stable; terminal: retuned)
Transitions	4
Operators composed	CT2, CT3, KO42
Audit clock	on · tick rate 1

What it's for

• Industrial PID tuning
• Flight-control health
• Autopilot certification logs

States

State	Role
stable	initial
marginal	intermediate
unstable	intermediate
retuned	terminal

Transitions

From	To	Operator	Fires when	Proof	Trigger / actions
stable	marginal	CT2	input.phase_margin_deg < input.marginal_deg	required	—
marginal	unstable	CT3	input.phase_margin_deg < input.unstable_deg || input.gain_margin_db < input.min_gain_db	required	—
marginal	stable	CT2	input.phase_margin_deg >= input.marginal_deg	required	—
unstable	retuned	KO42	input.retune_done == true	no	—

Operators it composes

Each transition fires a registry operator through the master equation (compute → prove → verify). This template composes:

• CT2
• CT3
• KO42

Browse the operators at /operators/; the building blocks a transition calls are the framework's protocols. KO42 is the always-on substrate operator; physics operators carry proof_required: true, so each fire runs the full compute → prove → verify path and lands a verifiable proof digest on your entangled state.

Deploy it

Inspect the full definition, then deploy it onto your state machine. Every fire is Zeqond-stamped onto your entangled state.

# 1. Inspect — the full definition (states, transitions, operators) as served
curl -sS https://zeqsdk.com/api/contracts/templates/control-loop-stability

# 2. Deploy onto your machine (auth: session; body carries your machine slug)
curl -sS -X POST https://zeqsdk.com/api/contracts/templates/control-loop-stability/deploy \
  -H "Content-Type: application/json" \
  -b "<your session cookie>" \
  -d '{"slug":"<your-machine>"}'
# → 201 { "ok": true, "contract": { "id": "…", "currentState": "stable", … },
#         "template_id": "control-loop-stability" }

The deploy path runs the same two-stage validation as the canonical create route (ContractDefinitionSchema.parse + validateContractDefinition against the live registry), writes the creation row onto your entangled state, and schedules the first fire. From there, drive transitions with POST /api/chain/<your-machine>/contracts/<id>/transition or let any triggers fire them autonomously.

Next

• Contract IDE — author, preview, and deploy contracts (this template is in the Templates tab).
• State Contracts — the full contract model: conditions, triggers, pre/post actions, lifecycle.
• Templates Library — every ready-to-deploy contract, grouped by category.
• Protocols — the named building blocks a transition composes.