OEE Parameters Calculation for Discrete Lines

The OEE calculation for Discrete Lines is similar classic OEE mode approach to the OEE calculation for standard units. It measures the performance and quality losses in terms of loss of production availability or productivity that are attributed to the performance and quality, respectively.

Unlike Classic OEE, OEE for discrete lines uses NCM subsystem as a source for Quality data instead of Waste records. It relies on disposition type to separate Good and Bad Quality. Also, for individual unit, operations are considered as an output. OEE for finished good is calculated on the virtual unit for each discrete line.

The OEE parameters Availability, Performance, and Quality for discrete lines are calculated based on the formula described in the following table.


OEE Parameter	Calculation Formula
Availability	Availability = Net availability run time/Planned production time, where, Net availability run time = Planned production time - Availability downtime.
Performance	Performance = Actual production/Target production. Where, Actual production is the actual productivity of the Unit. Target production is the potential productivity of the Unit Note: Rework operations are not included in the output count.
Quality	Quality = Net production/Actual production Where, Net production = Actual production - Waste Actual production is the actual productivity of the Unit Waste is the amount of operations where defects were generated (open defects are considered as bad quantity, normally scrap and rework are also considered as waste).

Discrete Line OEE Parameters Calculation

In this example, the value for each OEE parameter per day for a discrete manufacturing plant is as shown in the following table.


Inputs	Value
Planned production time	24hr
Availability downtime unit 1	1hr
Availability downtime unit 2	2hr
Op 10 Actual production	900 units
Op 10 Target production	1000 units
Op 20 Actual production	800 units
Op 20 Target production	1000 units
Op 10 units with defects	100
Op 20 units with defects	100

The following table provides the value of each OEE parameter calculated based on the formula described in the earlier section.


OEE parameter	Parameter value	Formula used	Explanation
Availability	Unit 1: 23/24 = 96% Unit 2: 22/24=92% Virtual Unit = 100%	Availability = Net availability run time/Planned production time.	For Unit 1: Planned production time = 24 hr Availability downtime = 1 hr Net availability run time = 24 - 1 = 23 hr For Unit 2 Planned production time = 24 hr Availability downtime = 2 hr Net availability run time = 24 - 2 = 22 hr
Performance	Unit 1 900/1000 = 0.9 Unit 2 800/1000 = 0.8 Virtual Unit 800/1000 = 0.8	Performance = Actual production/Target production	Unit 1: Actual production = 900 bottles Target production = 1000 bottles Unit 2: Actual production = 800 bottles Target production = 1000 bottles Virtual Unit: Actual production = 800 bottles (both operations complete) Target production = 1000 bottles
Quality	Unit 1 800/900 = 0.8889 Unit 2 700/800=0.875	Quality = Net production/Actual production	Unit 1: Actual production = 900 bottles Waste = 100 bottles Net production = 900 - 100 = 800 bottles Unit 2: Actual production = 800 bottles Waste = 100 bottles Net production = 800 - 100 = 700 bottles