The WorstQuality2 Aggregate defined in Table 47 returns the worst status of the raw values in the interval where a Bad status is worse than Uncertain, which is worse than Good. No distinction is made between the specific reasons for the status. The server shall ignore the TreatUncertainAsBad for this aggregate.

The start bound calculated using Simple Bounding Values (see 3.1.9) is always included when determining the worst quality.

If multiple values exist with the worst quality the MultipleValues bit is set. If multiple values exist with the worst quality but different StatusCodes then the StatusCode of the first value is returned.

This Aggregate returns the worst StatusCode as the value of the Aggregate.

The timestamp is always the start of the interval. The StatusCodes are Good, Calculated.

Table 47 – WorstQuality2 Aggregate summary

WorstQuality2 Aggregate Characteristics
Type		Calculated
Data Type		StatusCode
Use Bounds		Simple
Timestamp		StartTime
StatusCode Calculations
Calculation Method		Custom Always Good
Partial		Set Sometimes If an interval is not a complete interval
Calculated		Set Always
Interpolated		Not Set
Raw		Not Set
Multi Value		Used
StatusCode Common Special Cases
Before Start of Data	Bad_NoData
After End of Data	Bad_NoData
No Start Bound	No special handing required
No End Bound	No special handing required
Bound Bad	No special handing required
Bound Uncertain	No special handing required