Page 200 - ExtendSim User Guide
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174 Routing
Items going to several paths
ance with Activities, prevents items from going to a queue followed by an occupied activity when other activities are idle.
Line Balance with Activities model
As in the previous model, the queue lines tend to be more balanced than the Buffering Opera- tions model; but this method makes more efficient use of the Machines.
☞ Yet another option would be to use a Workstation block to replace the Queue and Activity blocks. The Workstation can report all of the items in its internal queue and activity through its Length connector.
Machines that can only process certain types of items
A typical assembly line can handle more than one type of item at a time. For example, you may have three stereo models being assembled on a single line. Most of the assembly is identical, but a few different parts are used at different points. Unfortunately, some machines in such a heterogeneous assembly line cannot work on particular models being assembled. The method for accomplishing this is a combination of splitting items into different paths to establish the different “types” of items, then recombining the paths appropriately for the different machines. The Select Item Out block and the Select Item In block are handy in such situations.
Processing by Type model
Assume there is an assembly line where each item has an attribute called Type that is either 1, 2, or 3, depending on the type of item it will be. At one step of the assembly process, there are four machines. Two of the machines can work on all three types, but one of the machines is old
Discrete Event

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