System overview

Open-FDD (package name open-fdd, import open_fdd) is a library for running fault detection and diagnostics (FDD) rules on pandas DataFrames. Rules are authored in YAML; the core type is RuleRunner in open_fdd.engine.

Data flow

  1. Your pipeline loads or builds a time-indexed (or otherwise keyed) DataFrame of sensor or calculated points.
  2. Column mapping connects logical point names used in rules to actual column names (dict, manifest YAML, or custom resolver).
  3. RuleRunner evaluates configured checks and returns fault results compatible with open_fdd.schema.

There is no required database, HTTP service, or message bus in this repository—the engine runs wherever you import it.