Configure optional functions

The Options tab contains a list of optional functionalities that can be used in your PI Totalizer. Options can be enabled or disabled, depending on the type of PI Totalizer that you are creating or editing.

• Allow External Reset — If you enable this option, you can write a new value to the PI Totalizer and force final results to be written. The PI Totalizer starts again using the newly entered value as its base.

• Use negative source values — By default, the PI Totalizer counts negative values of its SourceTag as 0. If you select this option, you override the default behavior and count negative source values as negative numbers.

• Source tag is a DCS integrator — If the SourceTag is a DCS PI Totalizer (integrator), you can use this option. When enabled, the PI Totalizer senses when the integrator is reset on the DCS, automatically writes its final results, and restarts.

• Close at end of the Sampling Period — This option is valid for event driven PI Totalizers. Select this option if you must close event driven PI Totalizers with periodic sampling at the end of their sampling period, rather than waiting for the next SourceTag event.

• Source OverRange is ZERO + SPAN — If you enable this option, SourceTagOverRange updates will be counted as the SourceTagZERO plus its SPAN.

• Use SourceTag BAD in place of "Bad Total" — If you enable this option, the SourceTag BAD status is used in place of the System State "Bad Total" when the percentage of good SourceTag values is insufficient for a valid PI Totalizer result to be generated

• Source UnderRange is: zero / bad — If you enable this option, you count SourceTagUnderRange updates as either BAD or ZERO, depending on which option you select.

• Final Result at: start/end/both — Specify whether to have the total written at the beginning, end, or both beginning and end of the sampling period you select.

• Conversion Factor — The number entered here is a conversion factor to scale the results of the PI Totalizer. This is especially important for a time weighted PI Totalizer. The PI Totalizer acts as though the SourceTag is in engineering units per day. The final result of the PI Totalizer is in engineering units. If the SourceTag has a different time scale (for example, gallons/minute), a conversion must be made to get the engineering units result. The conversion factor should be the time scale of the SourceTag, divided by one day, divided by the time scale (for example, [one min / (one day/1440 min)] or 1440). The default is 1.0.

• Source = Zero below — SourceTag events with values less than the number entered here will count the as zero for totalization.

• Pct good values needed — The number entered here is the percentage of GOODSourceTag updates required to produce a valid PI Totalizer result.