The states are characterized in Table 2 as a function of the activation of model-based tests, except the calibration state, which is clearly known by the WU maintenance department.
Table 2
Fault signatures based on the models' residuals
| PD | ANN | Cause | |
|---|---|---|---|
| 1 | 1 | 0 | Distribution sensor fault |
| 1 | 0 | 0 | Distribution sensor fault |
| 0 | 1 | 1 | Quality event |
| 0 | 0 | 0 | Normal state |
| PD | ANN | Cause | |
|---|---|---|---|
| 1 | 1 | 0 | Distribution sensor fault |
| 1 | 0 | 0 | Distribution sensor fault |
| 0 | 1 | 1 | Quality event |
| 0 | 0 | 0 | Normal state |