Sparkplug Quality Mapping

[AdamWoodland]

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Sparkplug B contains a quality property for each value the protocol handles however the values that it contains (Good, Bad, Stale) does not align with the OPC quality flags and so a mapping has defined within Geo SCADA, both when publishing data through the Sparkplug Publisher and when ingesting data using the Sparkplug Client Driver, to convert the qualities as necessary.

Quality Mapping When Publishing

Source OPC Quality	Published Sparkplug Quality
Good (Any)	Good
Bad (Any)	Bad
Uncertain -> Engineering Units Exceeded	Good
Uncertain -> Last Usable Value	Stale
Uncertain -> Sub-normal	Stale
Uncertain -> Sensor Not Accurate	Bad
[Any other quality state]	Bad

Quality Mapping When Receiving

Source Sparkplug Quality	Geo SCADA Stored OPC Quality
Bad	Bad
Good	Good
Stale	Uncertain -> Last Usable Value
[No quality provided]	Bad

Notes

• These mapping are hard-coded and cannot be modified per Geo SCADA system
• The extended OPC HDA quality flags are ignored when deciding the mapping
• Any limit masks applied to the quality flags are ignored when deciding the mapping

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