Rockwell Automation Arena Packaging Users Guide - Manual (Page 67)

4 • S TATISTICS
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4 • Statisti
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Performance Index (PI)—This statistic reports an overall rating for the palletizer. 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 palletizer had no loss, and was always a) filling or
emptying units at its nominal run speed, b) in a Time Between Layer, or c) in a Time
Between Pallet during its scheduled time. In other words, the palletizer was never starved
or blocked or had any changeovers or failures.
Normally, the PI for a palletizer will be less than 100. Locating and eliminating the source
of low PI can improve productivity.
T OTAL TIME
Total Time Fast—This statistic reports the total time the palletizer was in the Fast state
(i.e., had a speed factor greater than 1).
The value of this statistic is the total time the palletizer variable Palletizer Name_State had
a value of Fast(-1).
Total Time Working—This statistic reports the total time the palletizer was in the Working
state (i.e., had a speed factor equal to 1).
The value of this statistic is the total time the palletizer variable Palletizer Name_State had
a value of Working(3).
Total Time Slow—This statistic reports the total time the palletizer was in the Slow state
(i.e., had a speed factor less than 1 and greater than zero).
The value of this statistic is the total time the palletizer variable Palletizer Name_State had
a value of Slow(4).
Total Time Starved—This statistic reports the total time the palletizer was in the Fast,
Working, or Slow state but was starved.
The value of this statistic is the total time the palletizer variable Palletizer Name_Starved
had a value of Yes(1).
This statistic is a subset of the time span Total Time Slow + Total Time Working + Total
Time Fast.
Total Time Blocked—This statistic reports the total time the palletizer was in the Blocked
state due to being blocked (i.e., had a speed factor of zero for a reason other than a failure,
changeover, or scheduled stop).
The value of this statistic is the total time the palletizer variable Palletizer Name_State had
a value of Blocked(0).