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 permissions restrictions|
system.opchda.readProcessed(serverName, itemIds, startDate, endDate, resampleIntervalMS, aggregates)
String serverName - The name of the defined OPC-HDA server to read.
List[String] itemIds - A list of item ids to read.
Any startDate - The starting date/time of the query.
Any endDate - The ending date/time of the query.
Integer resampleIntervalMS - The interval, in milliseconds, that each value should cover.
List[Integer] aggregates - A list which should be one-to-one 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().
List[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.
Gateway, Vision Client, Perspective Session
system opchda readProcessed, opchda.readProcessed