MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung PDF herunterladen (Seite 104)

5 Designing Paths for Entities

5-14

to be notified of the change is the first to advance an entity to the Path Combiner

block. The Input port precedence parameter determines which of the block's entity

input ports is first in the notification sequence. For the list of options, see the online

reference page for the Path Combiner block.

Significance of Input Port Precedence

Consider the sequence of blocks in the figure below, in which a Path Combiner block

merges three small queues into a single large queue.

Suppose the server is busy serving an entity, the single large queue (FIFO Queue4)

is full, and each of the three small queues is nonempty. In this situation, the Path

Combiner block's entity output port is blocked. When the entity in the server departs,

an entity from the large queue advances to the server. The large queue is no longer full,

so its entity input port becomes available. As a result, the Path Combiner block's entity

output port changes from blocked to unblocked. The Path Combiner block uses the Input

port precedence parameter to determine the sequence by which to notify entity input

ports of the change. The sequence of notifications determines which of the three small

queues is the first to advance an entity to the large queue via the Path Combiner block.

The Input port precedence parameter is relevant only when the entity output port

changes from blocked to unblocked; the parameter is irrelevant in other situations. For

example, if the large queue has infinite capacity, or if at most one of the three small

queues is nonempty at any given time during the entire simulation, then all settings for

the Input port precedence produce the same behavior.

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MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung Seite 104