An Event Schema That Keeps Calculations Honest
Define a compact, consistent event schema: machine ID, timestamp with timezone, state code, counts, and optional annotations. Use enumerated values for states to avoid typos, and separate measured counts from calculated fields. Include correlation IDs for batches and orders to reconcile reports later. A clear schema prevents silent errors, enables confident transformations, and allows tools to automate OEE math without guesswork. Every future enhancement—alerts, comparisons, predictive checks—rests on this simple, reliable backbone.