Rockwell Automation Arena Packaging Users Guide - Manual (Page 98)

A RENA P ACKAGING T EMPLATE U SER ’ S G UIDE
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The two types of loss are described below.
Event-based loss
“We waste 500 to 1000 units of product every time we changeover the machine.”
“On average, we lose 50 containers every time the filler fails or jams.”
“When a conveyor is stopped for maintenance, we throw away all the units on the
conveyor.”
The first type of loss is the wastage of units that occurs due to discrete events at the
equipment (e.g., machine jams, changeovers, etc.). Arena Packaging allows you to define
loss for three types of events: failures, scheduled stops, and changeovers.
When selecting this option, enter the Lost Units After Failures, Lost Units After Stops,
and/or Lost Units After Changeovers. The values for these operands can be constants,
random distributions (e.g., UNIF (500,1000)), or expressions (e.g., a variable).
During the simulation, loss quantities are sampled at the end of each failure, scheduled
stop, or changeover event. For machines and palletizers, the loss is then immediately
produced at 100% of the equipment’s input rate (i.e., the next X units to enter the
equipment are “lost”). Note that, because filler and conveyor machines have capacities,
lost units travel down the length of these machines before being output from the end.
For conveyors, the loss is immediately transferred off the conveyor at 100% of the
conveyor’s output rate (i.e., the next X units transferred off of the conveyor are “lost”).