Selected Examples

Servers that Break Down I

You may have a need to model a server that periodically breaks down and is repaired. For example, a machine on an assembly line may periodically fail. Figure 9.14 shows such a model. The Server component labeled is the server that experiences down periods when it cannot service transactions.

Figure 9.14: A Server that Breaks Down

The process in the compound component labeled "Breakdown Loop" models the breakdown behavior. The transaction pool has a capacity of 1 so that, when it is started, one transaction is generated that cycles through the breakdown loop for the rest of the simulation. This loop has two delays: Delay 1 models the time when the server is in operation; Delay 2 models the time when the server is broken. The two triggers, labeled "Down" and "Up," stop and start the Server.

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