What data inputs are used to calculate OEE?

InputDescriptionSource
Scheduled Shift TimeTotal shift time (i.e. 7am - 3pm = 8 hours)User Input
Scheduled DowntimeBreaks/lunches/startup/cleanup time within a shiftUser Input
Capacity ReductionDowntime reason codes that reduce capacity (i.e. no scheduled production)User Input
Unplanned DowntimeTime when the machine is not considered runningAccumine SensorBot
Baseline TargetDivided from OEE and its components to identify baseline trendsUser Input
UtilizationTime when the machine is considered runningAccumine SensorBot
Part Count# of pieces (or cycles)Accumine SensorBot
Hourly TargetCan be either Fixed or Scheduled. 
Fixed = Fixed target for all production time (i.e. always 50 pieces per hour)
Scheduled = Variable target based on schedule. A weighted hourly target is calculated based on how long each scheduled target was active for during the reporting period.

The Enterprise OEE Report will use Scheduled targets if available and Fixed if not.
User Input or
Accumine SensorBot or
ERP Integration
Microstoppage TimeThe duration of time between machine cycles that is less than a specified threshold (i.e. any downtime under X minutes).

If the asset is in a microstoppage, it will continue to remain as "active"/green in order to categorize this time as a performance loss rather than an availability loss.
Accumine SensorBot
Rejects/Scrap# of pieces (or cycles) that do not meet quality standards.User Input or
Accumine SensorBot
Potential Production TimeScheduled Shift Time - Scheduled Downtime - Capacity Reduction
Calculated


How is OEE calculated?

There are 3 components to OEE in the Enterprise Report - Availability, Performance and Quality. It is important to know that some assets may not have enough data for all 3 components.


For example, if part count is not tracked in the Accumine Cloud, only Availability will be calculated for the asset. Performance and Quality will remain at 100%.


Component #1: Availability

Availability = ((Potential Production Time - Unplanned Downtime) / Potential Production Time) / Baseline Target


Component #2: Performance

This can be calculated multiple ways, depending on the data inputs available.


    Scenario #1: No Part Count or Microstoppage Data

    Performance = 100%


    Scenario #2: Microstoppage Data

    Performance = ((Potential Production Time - Sum of Microstoppages) / Potential Production TIme) / Baseline Target


    Scenario #3: Fixed or Scheduled Target

    Performance = ((Potential Production Time - ((Actual Cycle Time - Expected Cycle Time) * Part Count) / Potential Production Time) / Baseline Target


Component #3: Quality

This can be calculated multiple ways, depending on the data inputs available.


    Scenario #1: No Fixed or Scheduled Target

    Quality = 100%


    Scenario #2: Fixed or Scheduled Target Data

    Quality = (Potential Production Time - (Reject/Scrap * Expected Cycle Time)) / Baseline Target


Finally, OEE = Availability * Performance * Quality


Why can't I select certain assets?

There are two reasons why an asset might be disabled in the Enterprise OEE Report:

  1. Missing shift schedule - if an asset is not assigned at least one shift schedule, it will be disabled in the report.
  2. Missing minimum data - an asset must at least have Utilization/Downtime data in the Accumine Cloud.


What happens if I select a reporting period prior to the asset's deployment date?

The Accumine Reporting Engine will only request data for assets after their deployment date. This prevents the reduction in OEE values due to empty datasets.


We define the deployment date as the date the first data for an asset was transmitted to the Accumine Cloud.


Why do the results in the Enterprise Report differ from the Standard Plant Report?

The Enterprise OEE report uses Accumine's latest Accumine Reporting Engine (Version 3) that boasts up to 5x faster reporting speeds and other improvements. 


Minor discrepancies may be caused by rounding - discrepancies of 1-2% are the result variations of rounding and precision across the reporting pages. This does not affect the underlying results and does not indicate calculation errors are present.


A more noticeable discrepancy may be noticed due to Baseline Targets. The standard OEE report did not adjust OEE and its components except for in the Time Series chart. The Enterprise OEE Report, adjusts every single value displayed on the page.


How can I see the specific OEE calculation properties by asset?

Clicking on any asset in the left side-bar will reveal a pop-up window that provides detailed information about the asset.


How are differing shift schedules taken into account?

OEE data for each asset is calculated based on its specific shift schedule, then averaged and summed to provide a set of values for each calendar day.


The Enterprise Report OEE does not require user input to interface with shift schedules.


How are differing timezones taken into account?

OEE data for each asset is calculated based on the timezone specified in its shift schedule.


The Enterprise Report OEE does not require user input to interface with shift schedules.


How can I compare assets or locations against one another?

Once you generate a report, you are prompted and encouraged to manipulate the company tree in the left sidebar. This allows you to slice and dice the data between assets & locations.


The report takes a long time to generate. Can it be faster?

Version 3 of the Accumine Reporting Engine has been optimized to handle the millions of incoming data inputs per day entering the Accumine Cloud but we are always looking for ways to improve the user experience.


A few tips to improve the reporting speed:

  1. Reduce the number of selected assets/locations
  2. Break down the reporting timeranges into smaller timeframes (i.e. report by quarter instead of year)
  3. Check your internet speed/connection - as a benchmark, a weekly report for 1 asset should take no more than 5 seconds to generate.