Page 273 - ExtendSim User Guide
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Resources and Shifts 247
Phase II: Organizing resources
From the Insert quantity expression popup, choose 1 from Washer. This places that quantity expression in the expression area after the OR operator.
The expression should look like this:
Click the Save As button
In the dialog that appears, name the requirement Wash Requirement
This creates a new resource requirement named Wash Requirement. The expression area indi- cates that this requirement can be satisfied using either 1 resource from the Washer/Waxer pool or 1 resource from the Washer pool. If both the resources are available, the Washer/Waxer resource will be used first.
The expression is evaluated from left to right. Thus resources towards the left of the expression will be used before those on the right. This evaluation affects model results, as discussed on page 250.
Cars also requiring waxing
The next step is to create a new resource requirement for the cars that also want waxing. Those cars can use either one washer/waxer or one washer and one waxer.
To create the new resource requirement:
Select Choose Resource requirement: New resource requirement
To open a parenthesis in the expression area, click the “(” button, the left-most button in the row of buttons above the expression area. This is the left grouping operator for the expres- sion.
From the Insert quantity expression popup, choose 1 from Washer Click the AND operator
From the Insert quantity expression popup, choose 1 from Waxer To close the parenthesis, click the grouping operator “)”
Click the OR operator
From the Insert quantity expression popup, choose 1 from Washer/Waxer
The expression should look like the screenshot to the right.
Click the Save As button
Name the requirement Wash/Wax Requirement
When executed, this requirement will first attempt to allocate one resource from the Washer pool and one resource from the Waxer pool. If these resources are not both available, it will then attempt to allocate one resource from the Washer/Waxer pool.
Click OK to close the dialog
Discrete Event


































































































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