Logical zones grouped by device function for D-310. Physical detection-zone boundaries (Clause 13) are defined on the as-designed drawing.
| Optical Smoke | 6 |
| Heat Detector | 4 |
| Zone total | 10 |
| Manual Call Point | 2 |
| Zone total | 2 |
| Sounder | 5 |
| Zone total | 5 |
| I/O Interface | 1 |
| Zone total | 1 |