Variable or Property in the AddressSpace where a Client can access historical data
Note 1 to entry: A HistoricalDataNode represents any Variable or Property in the AddressSpace for which a Client may read and/or update historical data. “HistoricalDataNode’s 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.