OEE¶
OEE (Overall Equipment Effectiveness) measures how close production is to its full potential during the time you planned to produce. It answers "how much of our planned production time turned into good output, and is the loss in availability, performance or quality?" Busroot calculates OEE automatically from the data the other capabilities already record.
How it works¶
OEE has no signal of its own. It combines these inputs:
| Input | Where it comes from |
|---|---|
| Shift patterns | Admin > Shift patterns |
| Production schedules | Scheduling |
| Non-production and maintenance schedules | Scheduling |
| Ideal cycle times (SKU performance targets) | Admin > SKU, with the station's target as a fallback |
| Productive status | Asset Utilisation |
| Downtime | Downtime |
| Production count | Production Tracking |
| Bad (reject) count | Quality |
OEE counts only planned production time. Downtime lowers Availability, output below the ideal rate lowers Performance, and bad units lower Quality. Performance is only as accurate as the SKU performance targets.
Busroot calculates OEE continuously, so the figures on every page are up to date without any extra step.
Set it up¶
- Set up Asset Utilisation, Downtime and Production Tracking on each station.
- Give every SKU an accurate performance target (cycle time, units per minute or units per hour).
- Record bad units, so that Quality is not always 100%. See Quality.
- Plan production with production schedules, and plan maintenance and breaks with non-production schedules.
- Optional: to see Lost production cost, set a Value on each SKU in Admin > SKU and an Idle Cost Per Minute on each station in Admin > Station. Then turn on the Enable Lost Production Cost feature flag for the account in the account manifest.
Where you see it¶
- Cockpit: each station's OEE alongside its live status, schedule progress and the last hour's production.
- OEE Analysis: OEE split into availability, performance and quality, with scheduling and planned non-production losses, a breakdown of downtime by reason, and the cost of each loss.
- Interval Chart: the total lost production cost for each interval.
- Trend Viewer: OEE and Quality over time. The OEE chart shows the period average as a dashed line.
- Hierarchy Explorer: the OEE columns, rolled up from station to plant.
Metrics¶
OEE¶
%
How much of planned production time produced good output at the ideal rate.
OEE = Availability × Performance × Quality
- Notes OEE counts only planned production time: scheduled production time inside a shift. Out-of-shift time, time with no schedule and planned non-production time are not part of it. OEE Analysis shows these as scheduling loss and planned non-production loss, outside the OEE figure. Quality is the Quality rate from the Quality capability.
Availability¶
%
Run time as a share of planned production time.
Availability = run time ÷ planned production time, where run time = planned production time − total downtime
- Notes Planned production time is scheduled production time. Downtime is the availability loss, including manual downtime. OEE Analysis calls run time "Running Time".
Performance¶
%
Actual output compared with the output possible at the ideal cycle time.
Performance = (total units × ideal cycle time) ÷ run time
- Notes Total units are good and bad units. The ideal cycle time is the performance target of the SKU being produced, or of the station if the SKU has none. Performance is capped at 100%: producing faster than the target gives 100%, not more. The shortfall is the speed loss.
Lost production cost¶
account currency (£)
The value of output lost to availability, speed and quality loss.
- Formula Lost production cost = downtime loss cost + speed loss cost + quality loss cost + planned non-production cost
- Downtime loss cost (availability loss): the Downtime cost.
- Speed loss cost: the units that should have been produced at the performance target, minus the units produced (good and bad), × the SKU's Value. Busroot calculates it minute by minute, and it is never below zero.
- Quality loss cost: the Quality cost, bad units × the SKU's Value.
- Planned non-production cost: scheduled non-production minutes × the station's Idle Cost Per Minute.
- Notes The cost uses the SKU's value per unit. Where a SKU has no value, downtime is costed at the station's Idle Cost Per Minute. The Interval Chart shows the total, and OEE Analysis shows each part. Lost production cost appears only when the Enable Lost Production Cost feature flag is on.
FAQs¶
Where do I enter production output values?¶
Busroot uses two values to cost lost production:
- SKU value: in Admin > SKU, edit the SKU and set Value on the Production tab. This is the value of one unit.
- Station idle cost: in Admin > Station, edit the station and set Idle Cost Per Minute on the Downtime tab. Busroot uses it when the SKU has no value, and for planned non-production time.
What is Running Time on the OEE chart?¶
Running Time is planned production time minus downtime: the time the station was available to produce. A stop becomes downtime only once it passes the station's downtime threshold. Until then, it counts as Running Time. Once it passes the threshold, the whole stop moves from Running Time to downtime, back to its start. See How downtime is counted.