system.opchda.readProcessed
This function is used in Python Scripting.
Description​
Reads processed values from the OPC-HDA server. Processed values are calculated values, based on the aggregate function requested for each item. The list of aggregates can be obtained by calling system.opchda.getAggregates().
Client Permission Restrictions​
This scripting function has no Client Permission restrictions.
Syntax​
system.opchda.readProcessed(serverName, itemIds, startDate, endDate, resampleIntervalMS, aggregates)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| String | serverName | The name of the defined OPC-HDA server to read. |
| List | itemIds | A list of item ids to read. |
| Object | startDate | The starting date/time of the query. |
| Object | endDate | The ending date/time of the query. |
| int | resampleIntervalMS | The interval, in milliseconds, that each value should cover. |
| List | aggregates | A list which should be one-toone with the item ids requested, specifying the integer id of the aggregation function to use. The aggregation ids are defined in the OPC-HDA specification. The list of aggregates can also be obtained by calling system.opchda.getAggregates(). |
Returns​
ReadResults[] - A list of read results which is one-to-one with the item IDs passed in. The ReadResult object has a serviceResult quality property that indicates whether the call was successful, and is itself a list of QualifiedValues.
Scope​
All