Concept of Operations (ConOps) — ISO/IEC/IEEE 15289 — Description | IEEE 29148 §6.1
Generated 2026-03-27 — UHT Journal / universalhex.org
The Smart Building Management System exists to maintain safe, comfortable, and energy-efficient indoor environments for occupants of a large commercial office building while providing integrated control of HVAC, lighting, fire safety, and access control subsystems. Without this system, building operations would rely on fragmented manual controls, resulting in energy waste of 20-40%, degraded occupant comfort, delayed emergency response, and inability to meet modern energy performance regulations (EN 15232 Class A). The operational driver is reducing whole-life building operating costs while meeting net-zero carbon targets and ensuring life-safety compliance.
| Stakeholder | Relationship | Hex Code |
|---|---|---|
| Facility Manager | primary operator, monitors dashboard, responds to alarms, manages energy targets, coordinates maintenance (from Normal Operation, Degraded, Maintenance scenarios) | 010D5AF9 |
| Building Occupant | 2000+ office workers, expects 21-23°C/40-60% RH/500 lux, interacts via badge and comfort app, includes vulnerable individuals (from all operational scenarios) | 000C4289 |
| HVAC Maintenance Contractor | quarterly preventive + on-call corrective, requires BMS maintenance access, F-Gas certified (from Maintenance scenario) | 00843AF8 |
| Fire Safety Officer | responsible person under Fire Safety Order 2005, approves fire mode logic, conducts weekly tests, coordinates fire risk assessments (from Fire Emergency scenario) | 018D7AF9 |
| Building Owner/Energy Manager | sets net-zero targets, approves capex, reviews energy reports, concerned with EN 15232 Class A and EPC rating (from Demand Response scenario) | — |
| Security Operations Centre | 24/7 monitoring, validates visitor access, responds to security alarms, manages after-hours restricted mode (from Unoccupied Setback scenario) | — |
| Mode | Description |
|---|---|
| Normal Operation | occupancy >5% AND all subsystems nominal → HVAC 21-23°C/40-60% RH, daylight harvesting, demand response → exit on low occupancy or fault |
| Fire Emergency | confirmed alarm (two-detector or MCP) → HVAC shutdown, smoke extraction, stairwell pressurisation, doors fail-open, lifts recalled, fire service notified → exit on brigade all-clear + panel reset |
| Unoccupied Setback | occupancy <5% for 30min → HVAC 16-28°C, emergency lighting only, restricted access → exit on first badge-in after 05:30 |
| Degraded Operation | non-safety subsystem fault → local standalone control, reduced optimisation, alarm raised → exit when fault cleared |
| Startup/Commissioning | power restoration → sequential energisation (fire→access→HVAC→lighting), self-test, purge → exit when zones within 2°C |
| Maintenance | authorised request → zone/subsystem offline, safety interlocks active, overrides logged → exit when returned to auto |
05:30 BMS exits Setback, pre-occupancy purge, sequential HVAC warm-up, lighting follows cleaning crew. By 08:00 full occupancy, demand-responsive optimisation active. Happy path demonstrating startup-to-normal transition.
14:30 smoke detected floor 12, coincidence logic confirms in 15s, HVAC shutdown + smoke extraction + stairwell pressurisation in 30s, doors release, 2000 evacuated, fire service in 8min, all-clear at 45min, re-occupancy via Startup mode.
construction severs trunk to floors 15-17, 45 VAV + 12 AHU controllers lost, alarm to FM, controllers revert to standalone, fire systems unaffected (separate loop), 4-hour repair, occupants see ±2°C drift.
38°C outdoor, grid operator requests 20% load cut via OpenADR, BMS pre-cools then raises setpoints 2°C, dims perimeter lighting, shifts DHW/EV loads. FM approves. Compliance confirmed, DR credit earned.
Saturday 06:00, tech logs in, isolates AHU-03 (floors 7-9), BMS compensates via adjacent AHUs, filter replacement + coil cleaning + sensor calibration (±0.5°C/±3% RH), return to auto, self-test, compliance log generated.
| Category | Constraint |
|---|---|
| Physical | 50,000 sqm, 20+ floors, temperate maritime climate UK, -5°C to 38°C ambient, dual 11kV supply + diesel standby |
| Indoor | 21-25°C (season-dependent), 40-60% RH, 500 lux office, CO2 <1000 ppm, noise <40 dB(A) |
| Regulatory | EN 15232 Class A, BS 5839-1 Cat L1, BS 7671 18th Ed, Fire Safety Order 2005, Building Regs Part L, HSE ACOP L8, GDPR, BS EN 50131 |
| Network | BACnet/IP backbone on dedicated OT VLAN, Modbus RTU/TCP for legacy devices, cloud analytics via secured API gateway, cybersecurity per IEC 62443 |
| System | Interface | Hex Code |
|---|---|---|
| Utility Grid | 11kV/400V supply, smart meter for consumption data, OpenADR 2.0b for demand response signals. Owned by DNO. 99.9% availability. | 54B77A59 |
| Local Fire and Rescue Service | monitored fire alarm via BS 5979 ARC, dual-path signalling, one-way alarm transmission with zone location. 8-min response. 99.99% availability. | 40E57A58 |
| Cloud Analytics Platform | secured API gateway (TLS 1.3), receives sensor data for ML-based optimisation, returns setpoint recommendations. Owned by BMS vendor. Degraded operation possible without cloud. | — |
| Corporate IT Network | firewall-segregated interface for occupancy data from room booking system, visitor management, and HR badge provisioning. GDPR compliance required. Owned by tenant IT department. | — |