HistoricalDataNode – OPC Unified Architecture – Part 11: Historical Access

OPC Unified Architecture – Part 11: Historical Access

v1.05.04

1Scope
2Normative references
3Terms, definitions, and abbreviations
- 3.1Terms and definitions
- 3.2Abbreviated terms
4Concepts
5Historical Information Model
6Historical Access specific usage of Services
Annex AClient conventions (Informative)
- A.1How clients can request timestamps
- A.2Determining the first or last historical data point

3.1.5 HistoricalDataNode

Variable or Property in the AddressSpace where a Client can access historical data

Note 1

Note 1 to entry: A HistoricalDataNode represents any Variable or Property in the AddressSpace for which a Client can read and/or update historical data. “HistoricalDataNode history” or “history of a HistoricalDataNode” refers to the time series data stored for this HistoricalNode. Examples of such data are:

device data (like temperature sensors)
calculated data
status information (open/closed, moving)
dynamically changing system data (like stock quotes)
diagnostic data

The term HistoricalDataNodes is used when referencing aspects of the standard that apply to accessing historical data only.