Specifies a subtype of the function indicated by the FunctionType property. Only the 1 - ftArchivedValue, 2 - ftTagAttribute, and 6 - ftCalculatedData options have subtypes. For all other functions, FunctionSubType assumes the value -1 - fsNoSubType. The next table shows all possible values for this property, according to the selected function in the FunctionType property.
Subtypes for the ArchivedValue function (FunctionType equal to 1)
Subtype |
Description |
|---|---|
0 - fsPreviousArchivedValue |
Value stored right before the informed timestamp |
1 - fsInterpolatedArchivedValue |
Calculated value, based on previous and next values |
2 - fsNextArchivedValue |
Value stored right after the informed timestamp |
3 - fsExactArchivedValue |
If a stored value is found at the exact informed timestamp |
Subtypes for the TagAttribute function (FunctionType equal to 2)
Subtype |
Description |
|---|---|
0 - fsTagAttributeDescription |
Tag's meaning or description |
1 - fsTagAttributeSource |
Tag's path being stored |
2 - fsTagAttributeType |
Data type: Double, Boolean, or String |
3 - fsTagAttributeEU |
Engineering unit |
4 - fsTagAttributeLowEng |
Lower limit |
5 - fsTagAttributeHighEng |
Upper limit |
6 - fsTagAttributeDeadBand |
Dead band for recording |
7 - fsTagAttributeDeadBandUnit |
Dead band unit (an absolute value or a percentage) |
8 - fsTagAttributeMinRecTime |
Minimum recording time (variations smaller than this interval are not stored) |
9 - fsTagAttributeMaxRecTime |
Maximum recording time (the absence of variation on these intervals forces a recording) |
Subtypes for the CalculatedData function (FunctionType equal to 6)
Subtype |
Description |
|---|---|
0 - fsTotalCalculatedData |
Total of values |
1 - fsMinimumCalculatedData |
Minimum value |
2 - fsMaximumCalculatedData |
Maximum value |
3 - fsStandardCalculatedData |
Standard deviation |
4 - fsRangeCalculatedData |
Range of values |
5 - fsMeanCalculatedData |
Mean of values |
6 - fsMedianCalculatedData |
Median of values |