Operations · SPC
Statistical Process Control
14-rule Shewhart/Nelson engine · five chart kinds · violations raise root-cause flags
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No SPC-enabled subscriptions
Subscribe to tags with spcEnabled at /platform/setup/tags, then establish a baseline here.
How this connectsThe wire from sample to flag
- Driver (Ignition / OPC UA / MQTT / Modbus) emits a TagSample → connectivity ingester
- Ingester writes it to the per-signal ring and, on a baseline miss, establishes screened Phase I limits
spc/rules.evaluatePointruns the 14 rules against the point's own band- A warning or out_of_control verdict raises an entity flag via
rca/flagStore - The root-cause matrix at /platform/admin/root-cause picks the flag up automatically
- Design intent and the honesty rules:
docs/SPC.md