Logical zones grouped by device function for D-350. Physical detection-zone boundaries (Clause 13) are defined on the as-designed drawing.
| Optical Smoke | 12 |
| Multi-sensor | 3 |
| Zone total | 15 |
| Manual Call Point | 2 |
| Zone total | 2 |
| Sounder + VAD | 4 |
| Zone total | 4 |
| I/O Interface | 2 |
| Zone total | 2 |