Optional properties for shift frequency

• Interval: Value and Unit

  The time interval for sampling.

  You can link a sample plan frequency to QM specifications, as definitions of shifts are tied to entities, either directly or by inheritance. The QM specification must have at least the context of an entity, entity class, or item that has a shift schedule, so that the start and end of the shift can be determined.

  The unit of the interval. You can select any of the following:

  • Seconds

  • Minutes

  • Hours

  • Days

  • Weeks

    For example, an interval of 2 hours and a shift that runs from 8:00:00 AM to 3:59:59 PM will have samples at 8, 10, 12, and 2 assuming that there are no start or end offset, and no samples per shift.

• Offset Start: Value and Unit

  The amount of time calculated from the start of a shift when the first sample is generated. For example, if the shift starts at 8:00 AM and the Offset Start is 15 minutes, then the first sample occurs at 8:15 AM.

• Offset End: Value and Unit

  The amount of time calculated from the end of a shift when the last sample is generated. For example, if the shift ends at 4:00 PM and the Offset End is 15 minutes, then the last possible sample occurs at 3:45 PM.

  Depending on other settings of the shift frequency definition, there is no guarantee that a sample will occur at this time.

• Samples Per Shift

  The number of samples that are generated in every shift. The minimum value that you can type is 2. For example, a value of 2 for samples per shift, and no setting for the interval creates a sample at shift start plus offset start, and a sample at shift end minus offset end.

For more information on run time sample generation, refer the MES Middleware User Guide.