Rockwell Automation Discrete Machine Performance Solution - Manual (Page 30)

D ISCRETE M ACHINE P ERFORMANCE S OLUTION U SER ’ S G UIDE
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• • • • •
This reduces to:
Discrete MPS gathers and stores all of the raw data necessary to make this calculation for
specific time periods, as well as by activity area, by part number, and by shift. All of the
individual components of the calculation are stored and available for analysis.
OEE is a valuable method of analyzing performance because it is widely recognized and
can be applied to any type of industry, factory, or machine. Further, Discrete MPS
supports the collection of detailed event data, which can be used to analyze the specific
causes of inefficiencies.
Refer to “Efficiency Analysis” on page 39 for a description of how to configure Discrete
MPS to determine OEE.
User-defined summarization criteria
A summarization criterion is a Discrete MPS Performance Parameter field for which
activity area data can be collected. When the value of the field changes, it triggers the
summarization of historical performance data for the activity area in the Discrete MPS
Workcell report data source. The collected values can then be used to filter OEE
performance data for the activity area. For example, if your system is configured to collect
Part ID (a default summarization criterion) for an activity area, you will be able to
calculate the OEE performance for the activity area when it is producing a particular kind
of part. In addition to the default summarization criteria — Shift, Part ID, and Ideal Cycle
Time — for which Discrete MPS can collect data values, you can configure up to five
user-defined summarization criteria, or flex fields, to represent the fields that are most
important to your organization. User-defined summarization criteria function just as the
default summarization criteria do, but, because they are user-defined, they allow you to
tailor Discrete MPS to meet your organization’s data collection and summarization needs.
The following are sample uses of user-defined summarization criteria:
„ An Operator ID user-defined summarization criterion that will allow you to collect
operator IDs and to report on the OEE value for a specific operator.
„ A Lot Number user-defined summarization criterion that will allow you to collect lot
numbers and report on the OEE value for a specific lot of products.
OEE Availability Throughput × Quality ×
=
OEE
RunningTime
AvailableTime
-----------------------------------------
TotalParts IdealCycleTime ×
RunningTime
--------------------------------------------------------------------------------- ×
GoodParts
TotalParts
------------------------------ ×
=
OEE
IdealCycleTime GoodParts ×
AvailableTime
---------------------------------------------------------------------------------- =
Discrete.book Page 24 Wednesday, December 8, 2004 2:22 PM