A factory floor is not short of data. It is short of trust. The OEE screen says 0 % — is the machine idle, or is the counter unmapped? A quality figure of 100 % — was every part good, or does nobody count rejects? A dashboard that cannot tell you which is worse than no dashboard, because it teaches people to stop reading it.
The rule
Toleron enforces one rule in code, everywhere a number is shown: a value that is not measured is shown as not computable — n/c — never as 0 and never as 100. It sounds trivial. It has consequences in every layer.
- OEE is availability × performance × quality. If quality is not measured, the product does not substitute 1.0 and it does not substitute 0. It shows n/c, labels the number A×P, and says so in a coverage banner.
- A machine with no goal configured says No goal set rather than inventing a target.
- Unclassified downtime and Not Reporting are always distinct — one is a human backlog, the other is a connectivity problem.
- A machine state derived from a current clamp is labelled CT derived; one whose thresholds were never calibrated says Not Calibrated instead of showing a colour.
- A dead controller session returns nothing. A “last known good” value is how a dashboard shows a machine running while it is off.
- A recording that could not be captured completely finalises as truncated, with the reason, instead of silently looking complete.
- An AI pipeline whose input sensor went silent in a window produces no score at all, because padding a missing sensor with a stale value reports a machine state that never existed.
What it costs
Our lab fleet spends most of its day idle, because it is a laboratory. Screenshots of the performance dashboard therefore show 0 % and n/c in most tiles. A dashboard fed with fixture data would look better; ours is telling the truth. We have chosen to live with the less impressive screenshot, and we re-shoot during real cutting runs.
What it buys
The only thing that matters when the number is challenged in a meeting: provenance. When a Toleron report says availability was 62 % last week, every input to that figure is mapped, labelled and timestamped, and every input that is missing is named. A plant manager can put that number in front of a board. That is not a feature. It is the product.