Logical zones grouped by device function for D-301. Physical detection-zone boundaries (Clause 13) are defined on the as-designed drawing.
| Optical Smoke | 14 |
| Heat Detector | 4 |
| Zone total | 18 |
| Manual Call Point | 3 |
| Zone total | 3 |
| Sounder | 6 |
| Sounder + VAD | 2 |
| Zone total | 8 |
| I/O Interface | 2 |
| Zone total | 2 |