Rockwell Automation Arena Packaging Users Guide - Manual (Page 57)

4 • S TATISTICS
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4 • Statisti
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Number of Scheduled Stops—This statistic reports the number of scheduled stops that
occurred at the machine.
The value of this statistic is the last value of the machine variable Machine Name
_NumScheduledStops.
Number of Blockages—This statistic reports the number of blockages that occurred at the
machine (i.e., number of times speed factor equaled 0 for reason other than failure,
changeover, or scheduled stop).
P ERFORMANCE
Average Speed Factor Greater Than 0—This statistic reports the average speed factor of
the machine when the machine was running (i.e., had a speed factor greater than zero).
The average speed factor is equivalent to the average run speed of the machine divided by
its nominal run speed.
The value of this statistic is the time-weighted average of the machine variable Machine
Name_SpeedFactor over the time the machine had a speed factor greater than zero.
Average Output Rate Greater Than 0—This statistic reports the average output rate of the
machine when the output rate was greater than zero (Units/BaseTimeUnit).
The value of this statistic is the time-weighted average of the machine variable Machine
Name_OutputRate over the time the machine had an output rate greater than zero.
Average Output Factor—This statistic reports the ratio of the Average Output Rate
Greater Than 0 statistic to the nominal run speed of the machine.
Yield—This statistic reports the efficiency of the machine for producing good product.
This statistic is calculated as follows:
Yield = ((Total Good Units Produced)/(Total Good Units Produced + Total Units Lost)) * 100
Performance Index (PI)—This statistic reports an overall rating for the machine. Under
ideal conditions, the PI value is greater than or equal to 100. This statistic is calculated as
follows:
PI = ((Yield) * (Utilization) * (Average Output Factor))/100
Therefore, a PI of “100” means that the machine had no loss, and was always delivering
product to the downstream process at its nominal run speed during its scheduled time.
Normally, the PI for a machine will be less than 100. Locating and eliminating the source
of low PI can improve productivity.
T OTAL T IME
Total Time Fast—This statistic reports the total time the machine was in the Fast state
(i.e., had a speed factor greater than 1).