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  • Ranking rule

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General Simio discussions. THIS IS *NOT* A GOOD PLACE FOR SUPPORT QUESTIONS.
To limit spam this and all Public Forums have very limited ability to attach files. We recommend that support issues and more technical topics be initiated inside one of the Simio Insider (SI) forums below where you can attach your model and see example solutions. See above Welcome forum to join Simio Insiders.
 #2605  by CSteinlicht
 Thu Oct 11, 2012 1:31 am
For the ranking rule of a workstation, I want the workstation to choose the entity on the basis of the changeover matrix. The entity should be chosen in way that it will have a least setup time changeover. Lets say entity2 and entity3 arrive at a same time in input buffer, and entity1 was the last processed entity. And setup time to change from entity1 to entity2 is 1 min and to change from entity1 to entity3 it takes 2 min setup time. In this case, Entity 2 should be chosen next. Need help!!

Santosh Joshi
santosh.joshi@sdstate.edu
 #2616  by dsturrock
 Fri Oct 12, 2012 1:28 pm
Since Workstation has built-in setup time, I would recommend using that. Instead of ranking the queue by setup time, it is probably better to do dynamic selection from the queue based on setup time.

You can do that by specifying Smallest Value First for the Dynamic Selection Rule and for the Value Expression use Workstation1.SetupActivity.ActualDurationFor(Candidate.Entity).

Here is that solution applied to our Simbit WorkstationWithSequenceDependentSetup:
MinimizeSetupTime.png
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