Rockwell Automation FactoryTalk Report Expert User Guide - Manual (Page 172)

Chapter 10 Glossary of Fields
172 Rockwell Automation Publication RPTEXP-UM001H-EN-P-June 2014
Min. Duration/Event Severity
The shortest event or state occurrence (for grouping rows). / The
numeric severity level assigned to the event (for detail rows).
MTBF
MTBF = Uptime ⁄ FaultCount
Mean Time Between Failure (MTBF) is the ratio of running time to
the total number of failures. It measures the average amount of time
when a piece of equipment was in a running state between failures.
MTBF 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.
MTTR
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.
OEE %
The product of Uptime, Throughput, and Quality. The calculation
for this field is:
OEE % = Uptime x Throughput x Quality.