Interrupt Types

An interrupt's type drives the behavior of the time to failure and accounting of time.

The choices below describe how the number drawn from the uptime distribution is compared to an elapsed clock. The choices are:

• Wall Clock The elapsed simulated wall clock (sim time) determines the interrupt start. In this case, the sampled time is treated as Time Between Failure (TBF), and thus includes the downtime. This is best used for scheduled events; e.g. Lunch, or Safety Meeting.

• Uptime - Competing The elapsed uptime (the time the node is processing material; e.g. Actual Rate > 0) determines the interrupt start. Competing is best used for random interrupts; e.g., random failure.

• Uptime - Cumulative The elapsed uptime determines the interrupt start. Cumulative is best used for wear-out and/or yield-out conditions; e.g., a splice or roll change on a packaging line, or a gas refill or battery recharge on an automobile.