| Quality names | Description | Value | Associated DA Quality |
|---|
| OPCHDA_EXTRADATA | More than one piece of data that may be hidden exists at same timestamp | 0x00010000 | Good, Bad, Quest |
| OPCHDA_INTERPOLATED | Interpolated data value | 0x00020000 | Good, Bad, Quest |
| OPCHDA_RAW | Raw data value | 0x00040000 | Good, Bad, Quest |
| OPCHDA_CALCULATED | Calculated data value, as would be returned from a ReadProcessed call | 0x00080000 | Good, Bad, Quest |
| OPCHDA_NOBOUND | No data found to provide upper or lower bound value | 0x00100000 | Bad |
| OPCHDA_NODATA | No data collected. Archiving not active (for item or all items) | 0x00200000 | Bad |
| OPCHDA_DATALOST | Collection started / stopped / lost | 0x00400000 | Bad |
| OPCHDA_CONVERSION | Scaling / conversion error | 0x00800000 | Bad |
| OPCHDA_PARTIAL | Aggregate value is for an incomplete interval | 0x01000000 | Bad, Quest |