An activity can be periodically taken off line for routine scheduled maintenance, etc. For example, a cutting activity is suspended every two hours to change blades. The change takes 2.3 minutes.
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An activity can be periodically taken off line for routine scheduled maintenance, etc. For example, a cutting activity is suspended every two hours to change blades. The change takes 2.3 minutes. |
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In this solution, an activity randomly fails, interrupting the current entity being processed. When it is repaired, the current entity resumes its activity. For example, a printing machine in a publishing process goes down randomly every 10 minutes exponentially distributed. The repair time is roughly triangularly distributed with a min, mode and max of 1, 4 and 15 minutes respectively. |
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Activities that process multiple entity types may require that an equipment setup or changeover be performed when changing over from one entity type to another. For example, a milling machine is used to mill two different parts with different patterns and tooling requirements. Part A requires a 2 minute setup while Part B requires a 3 minute setup. |
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A packaging activity is performed only between the hours of 2 to 5 p.m. Monday through Friday. Goods waiting to be packaged simply accumulate until the packaging activity comes on line. In this example, an activity is only scheduled to work on entities between certain times. |
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