The following table shows recommended event categories for each event type, and recommended
conditions corresponding to each event category. It is recommended that OPC condition names
leverage Foundation Fieldbus naming as appropriate. As an example, the condition indicating a PV
has entered into a High High Alarm condition is named HI_HI which then matches the Foundation
Fieldbus HI_HI Alarm Type.
| Event Type | Event Category | CONDITION |
| Condition Related | Level | PVLEVEL (Multi State) |
| SPLEVEL (Multi State) | ||
| LO_LO (Single State) | ||
| LO (Single State) | ||
| HI (Single State) | ||
| HI_HI (Single State) | ||
| Deviation | DV_LO (Single State) | |
| DV_HI (Single State) | ||
| Discrete | CFN (Change From Normal) | |
| TRIP | ||
| COS (Change Of State) | ||
| Statistical | ||
| System Failure | SYSTEM_FAILURE | |
| Simple | Device Failure | |
| Batch Status | ||
| System Message | ||
| Tracking | Operator Process Change | |
| System Configuration | ||
| Advanced Control |