PI Developer Technologies

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Welcome to the PI Developer Technologies feedback page!  

This forum covers the PI AF SDK, PI Web API, PI OPC DA and HDA Servers, and the PI SQL family. We created this forum to hear your ideas, feature suggestions and feedback. Please suggest your most important features and design change ideas on this site, and vote for your favorite ideas.

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  1. Support attribute types referencing AF Elements and Attributes

    We use attributes to reference elements and attributes extensively to model context and relationships in our AF models. Is this going to be supported in the future? Kind regards, Gregor

    6 votes

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    0 comments  ·  PI Web API  ·  Flag idea as inappropriate…  ·  Admin →
    EVALUATING  ·  Frank Garriel responded

    This item is under review. Currently considering the following behavior for attributes links:
    Current behavior:
    Error returned: “Unsupported data type: ‘OSIsoft.AF.Asset.AFAttribute’.”
    Similar error for AFElement.

    Change under consideration:
    Value link for Attributes of value type “Attribute” returns the referenced attribute’s GET response (“/attributes/[webid]”)
    Value link for Attributes of value type “Element” returns the referenced element’s GET response (“/elements/[webid]”)

  2. Allow subscribing/unsubscribing to attributes on existing channel connection

    The channel/websocket feature of PI Web API would be more useful if it was possible to subscribe/unsubscribe to attributes on an existing channel connection. Currently you have to open the connection with all the WebIds you want in the resource URL. If you want to change which values you are receiving, you would have to close the connection and open a new one. Adding this new feature would also solve issues with maximum URL length limitations.

    5 votes

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    0 comments  ·  PI Web API  ·  Flag idea as inappropriate…  ·  Admin →
    EVALUATING  ·  Ray Verhoeff responded

    This is an issue we definitely need to address for both the reasons you suggested. We should be able to add and remove attributes while a channel is open. We also need a mechanism for signing up for large numbers of WebIds when the list would be too long for a URL.

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