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Tips and Techniques 315
Item library blocks
Table of block types
Not all of the blocks in the Item library fit neatly into these categories, but it is helpful to use the categories as a framework for thinking about the messaging architecture. Following is a table of the blocks in the Item library and their associated type.
Block
Type
Block
Type
Activity
Residence
Queue Matching
Residence
Batch
Residence
Read(I)
Passing
Catch Item
Passing
Resource Item
Residence
Convey Item
Residence
Resource Pool
N/A
Cost By Item
Passing
Resource Pool Release
Passing
Cost Stats
N/A
Select Item In
Decision
Create
Residence
Select Item Out
Decision/Residence*
Equation(I)
Passing
Set
Passing
Executive
N/A
Shift
N/A
Exit
Residence
Shutdown
Residence
Gate
Decision
Throw Item
Passing
Get
Passing
Transport
Residence
History
Passing
Unbatch
Residence
Information
Passing
Workstation
Residence
Queue
Residence
Write(I)
Passing
Queue Equation
Residence
* If an item is allowed into the Select Item Out block before the decision is made (see the dia- log check box), then it is a residence-type block. If the decision is made before the item enters the block, then it is a decision-type block.
Common connectors on discrete event blocks
Many blocks use abbreviations or acronyms to indicate a connector’s purpose. Some of these represent more than one purpose and are context sensitive. The following connector labels appear on many Item library blocks:
Connector Meaning
 Delta
# Count
A Average cost (Cost By Item) AD Accumulated demand (Gate) AS Activity status
BT Blocked time
Discrete Event


































































































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