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Status Reviewing
Portfolio area Enterprise SCADA Server
Products Realtime API/SDK
Created by Collin Heggerud
Created on Apr 8, 2024

RELATED IDEAS

Allow chained VDB field put overrides so integrators can override baseline fields

During development of some CIP functionality for [a customer], (EXT-417), we needed to trigger some protocol specific functionality when the "poll group" field changes. However, when we added a VDB override, it wasn't called. [R&D Architect] has confirmed that when a baseline VDB override exists, any additional overrides added are added lower in the table, and only the first override is called, so there is no way for us to achieve what we are trying to do. This will likely appear as a defect to [the original customer], so we will need to manage that and update this ticket with the outcome later.

Moreover, after Extensions overrides a field, it is possible another Extensions project, or a system integrator would also need to override the same field. So a chaining should be possible, or perhaps all field puts should be called. Consideration of this is required.

See attached for some background.

RE Telemetered ...
RE Telemetered Poll Group vdb overrides.msg
 RE Telemetered Poll Group vdb overrides.msg
Open full size
RE Telemetered Poll Group vdb overrides.msg
Expectation

Multiple VDB overrides for the same function should run one after the other, with a configureable ordering.

The subsequent overrides should be given the same arguments as the pre-existing overrides, with any input/output variables updated to the latest values from the previous override.

Might make sense to limit this to the types of overrides needed by those requesting it (mostly to do with protocols).
Idea business value

Allow integetrators to overide baseline functionality by using an extensibility method that currently is limited to a single extension.
Idea Type Improvement
Idea priority 4 – Important to my company
  • Attach files
  • Hugh Arai
    Aug 13, 2025

    The SE WWW group has also expressed interest in getting this functionality into the product.

    Reply