The NumberOfTransitions Aggregate defined in Table 35 returns a count of the number of transition the Variable had during the interval. If one or more raw values are Bad, they are not included in the count, and the Aggregate StatusCode is determined using the StatusCode Calculation (see 5.3) for non-time based Aggregates.
The earliest transition shall be calculated by comparing the earliest non-Bad value in the interval to the previous non-Bad value. A transition occurred if no previous non-Bad value exists or if the earliest non-Bad value is different. The endTime is not considered part of the interval, so a transition occurring at the endTime is not included.
Unless otherwise indicated, StatusCodes are Good, Calculated.
Table 35 – NumberOfTransitions Aggregate summary
|
NumberOfTransitions Aggregate Characteristics |
||
|
Type |
Calculated |
|
|
Data Type |
Int32 (negative values are not allowed) |
|
|
Use Bounds |
Custom, a non-Bad value prior to the interval is used |
|
|
Timestamp |
StartTime |
|
|
|
||
|
StatusCode Calculations |
||
|
Calculation Method |
PercentValues |
|
|
Partial |
Set Sometimes If an interval is not a complete interval |
|
|
Calculated |
Set Always |
|
|
Interpolated |
Not Set |
|
|
Raw |
Not Set |
|
|
Multi Value |
Not Set |
|
|
|
||
|
|
||
|
StatusCode Common Special Cases |
||
|
Before Start of Data |
Bad_NoData |
|
|
After End of Data |
Bad_NoData |
|
|
No Start Bound |
Treat the beginning value as Bad_NoData and compute the Aggregate |
|
|
No End Bound |
Treat the ending value as Bad_NoData and compute the Aggregate |
|
|
Bound Bad |
Use as value and compute the Aggregate as defined |
|
|
Bound Uncertain |
Use as value and compute the Aggregate as defined |
|