Main Content

Processed Data

Read data from an OPC server that has been processed by the server

Historians can include the ability to process raw data in a variety of ways before returning it to you. Examples of such processing include the interpolation of data points, time averaging, and standard deviation calculations. Processing of data can be very useful when there is a large amount of data on the server. Instructing the server to return only a processed data set can greatly reduce the time and volume of data transferred.

Functions

readAtTimeRead data from an OPC HDA server at specified times
readProcessedRead server-aggregated data from an OPC HDA server
getDescription Get description of OPC HDA aggregate type or item attribute
getIDFromNameTranslate OPC HDA aggregate type or item attribute name to numeric identifier
getIDListGet all aggregate type or item attribute IDs
getNameListGet all aggregate type or item attribute names

Topics

Read Historical Data at Specific Times

Read values for a list of items at specific times.

Read Processed Aggregate Data

Instruct the server to return only a processed data set.