Rockwell Automation FactoryTalk Metrics User Guide - Manual (Page 29)

Collecting Performance Data Chapter 3
such, can only be used in summary report objects and cannot have
aggregate functions applied.
MTTR = FaultTime ⁄ FaultCount
Mean Time to Repair (MTTR) is the ratio of the time spent in a
failure state to the total number of failures. It measures the average
amount of time when a piece of equipment was in a failure state.
MTTR is a derived field that contains aggregate functions and, as
such, can only be used in summary report objects and cannot have
aggregate functions applied.
NOTE
To collect fault metrics for an activity area, you will need to create
custom events for the workcell. For information on creating custom
events, see “Viewing the Performance Parameter Events for an Activity
Area (page 81)”.
FactoryTalk Metrics allows you to create time patterns that will be
used to calculate the amount of available time for an activity area.
The OEE calculation is based on available time, so the calculation
will not be accurate unless the available time is defined accurately.
It is not necessary for you to use a time pattern to define available
time for an activity area; however, if you do, the OEE calculation for
the activity area will not be negatively impacted by the periods of
time when the activity area is scheduled to be unavailable (e.g.,
weekends or evenings).
NOTE
To define time patterns, configure composites, and schedule exceptions,
you must be granted the Manage Time Pattern privilege by your
RSBizWare administrator.
A time pattern defines the availability of an activity area over time,
which repeats as necessary during the activity area schedule. We can
define the following durations of repeating periods:
Mean Time To Repair
Configuring Activity Area
Schedules
Time Patterns
Rockwell Automation Publication PLTMT-UM001M-EN-P-June 2014 29