Historians: Write Values
This article describes starter solutions related to writing values to a historian.
What Does This Article Cover?
Intelligence Hub can be used to create solutions that write values to historians and create points and tags. The starter solutions are described for specific historians.
General Intelligence Hub design considerations for writing values
These considerations pertain to writing values to a historian.
- Intelligence Hub can be used to obtain data from an external source. This includes the values to write to the historian and possibly the timestamp and information that will be used to name the point or tag.
- An Intelligence Hub Model may be used to structure a data payload to conform to the requirements for the Connection Output for the historian.
AVEVA PI System Data Archive design considerations for writing values
These considerations pertain to writing values and creating PI Points in the PI System Data Archive.
- Use the Intelligence Hub PI Connection Point Type Output.
- Structure the payload using a Pipeline Model stage.
- Structure the payload for the PI Connection Output. The name of the value's attribute will be used in the PI Point name.
- Consider the use of the Timestamp field.
- When writing a single value to the Connection Output the time value maybe be obtained from _timestamp or a dynamic reference in the Timestamp field.
- When writing an array of values to the Connection Output with Breakup Arrays switched on the time value maybe be obtained from _timestamp or a dynamic reference in the Timestamp field.
- When writing an array of values to the Connection Output with Breakup Arrays switched off the time value maybe be obtained from _timestamp but not from a dynamic reference in the Timestamp field.
- Use the Create radio button to create new PI Points.
- The syntax of the PI Point is determined by Intelligence Hub and the values for Path and Point Name.
- Consider the Update Options and how the Data Archive should be updated for the respective use case.
- Use the Attribute Filter to prevent attributes used for naming from being written to PI.
Canary Historian design considerations for writing values
These considerations pertain to writing values and creating tags in Canary.
- Use the Intelligence Hub REST Client Connection.
- Structure the payload using a Pipeline Model stage.
- Structure the payload for the Canary API's required format.
- It is necessary to obtain a session token from the Canary API.
Summary
Please utilize the considerations provided in this article as you implement an Intelligence Hub solution.
Additional Resources