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``````Tutorial for Discrete Rate Systems 343
A basic discrete rate model
the block’s dialog. Once the maximum capacity is reached, the full item/pallet leaves the block. The Interchange block then has no capacity until another empty pallet arrives.
☞ The Interchange block is discussed more fully in “Using the Interchange block to mix items with flow” on page 424.
Adding a palletizing area to the model
Delete the Yogurt tank.
Place the following blocks in the model and connect
their item connectors as shown at right: Create (Item library)
Queue (Item library) Interchange (Rate library)
Exit (Item library)
First palletizing area
Label the 4 new blocks as indicated in the screen shot above.
Connect from the outflow connector of Change Unit 2 to the plotter’s top input connector.
Connect from the outflow connector of Change Unit 2 to the inflow connector on the Inter- change 1 block.
In its dialog, set the behavior of the Create block to Create items randomly, choose the Con- stant distribution, and enter constant: 2. This causes one item/pallet to be available every 2 minutes.
There are no changes required for the Queue block. It is already set to hold items in a first in, first out manner.
In the Item/Flow tab of the Interchange block, define item behavior (Item is Tank) by mak- ing the following entries:
On arrival, Item/Tank capacity is: a constant 24 cartons. (Be sure to enter the number 24.)
Release item: when tank contents  Level (load process).
Define Level: full.
With these settings, the Interchange block has a capacity of 24 cartons each time it gets a new item, which represents an empty pallet. Once 24 cartons of yogurt have arrived through its flow connector, the block’s Level will be full and the item (now representing a full pallet with 24 cartons) will be released. The Interchange block will then try to access another empty pallet; the yogurt process will stop until an empty pallet is available.
There are no dialog changes required for the Exit block.
Discrete Rate

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