How to configure digital tag to be updated when on changed only ? not periodic
What is the PI interface?If it's OPC DA, you have to change the value of location3 to 0.
You can consult the OPC DA manual at the link below:
Dear Thiago..thank you....the interface is PI OPC IntBest Regards,Jerry Agung S. | Project ManagerMobile : +62 821 2235 1657| Email : firstname.lastname@example.org Head Office : Jl. Kembar 1 No. 12, Regol, Bandung 40253Phone : +62 22 522 3648 | Fax : +62 22 520 6258
PI Interface for OPC DA
If you use polled tags then you are returning data for every tag you have on that interface, regardless of whether the value has changed or not. If you use advise tags, then you only get data for tags that have changed in value/status.
Hi Mallesh..thank for info
Answers will only be relevant if we know what interface / connector you are using to collect data.
Hi...Thank for comment..I'm using the PI OPC Interface
OK, then, using Advise method will achieve your objective.
See Polled vs. Advise tags on the PI Interface for OPC DA for more details
Polled: Input is collected and stored in PI points based on the scan class configured for the point and the update rate of the OPC server. The interface polls the OPC server at a regular rate.
Advise: Input is collected and stored in PI points when the OPC server updates item values in the server cache, based on the scan class configured for the PI point. The interface updates PI points when advised that a value changed.
Scan class 1 is reserved for advise points, and you can create additional scan classes for advisepoints as required. Ensure that the scan class rate is fast enough to capture all the changesfrom the data source.
Note:Do not assign the same scan class to both advise and polled points. Use a separate class for each point type
The location3 attribute specifies whether this PI point is a polled, advise, event, or output point.
Set Location3=1 for advise.
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