System

{{entity:Automated Warehouse}} decomposition, completing the first pass across all 8 subsystems. This session decomposed the final three subsystems: {{entity:Building Management and Safety System}} (safety-critical, prioritised first), {{entity:Packing and Dispatch System}}, and {{entity:Goods Receiving System}}. Status moved from in-progress to first-pass-complete. The project now holds 168 requirements, 137 trace links, and 44 components across 8 subsystems.

Decomposition

Building Management and Safety System — six components reflecting the real functional domains of warehouse facility management: {{entity:Fire Detection and Suppression System}} ({{hex:55F77A58}}), {{entity:Access Control and Intrusion Detection System}}, {{entity:HVAC and Environmental Monitoring System}}, {{entity:Emergency Shutdown and Evacuation System}}, {{entity:Building Management Controller}}, and {{entity:Lighting Control System}}. The architecture uses a hybrid integration approach — BACnet/IP for HVAC and lighting (tolerant of network latency), but hardwired EN 54 fire alarm loops and ISO 13849 PLe E-stop circuits for safety functions that must operate independently of the BMS controller.

Packing and Dispatch System — five components in a sequential inline pipeline: {{entity:Automated Packing Station}} ({{hex:D5F73208}}), {{entity:Shipping Label and Documentation Printer}} ({{hex:D4E57018}}), {{entity:Weight and Dimension Verification Station}} ({{hex:54A72818}}), {{entity:Outbound Sortation System}} ({{hex:57F77208}}), and {{entity:Dispatch Dock Management System}} ({{hex:41B77B18}}). Sequential topology was chosen because weight/dimension verification creates a natural serial dependency — parallel cells would require complex merge logic without improving throughput.

Goods Receiving System — five components separating physical handling from identification and routing logic: {{entity:Inbound Dock and Unloading Station}} ({{hex:DE851018}}), {{entity:Inbound Quality Inspection Station}} ({{hex:55E63A18}}), {{entity:Receiving Barcode and RFID Scanner Array}} ({{hex:D5E77008}}), {{entity:Put-Away Assignment Engine}} ({{hex:41F73B08}}), and {{entity:Inbound Conveyor Interface}} ({{hex:DEA53008}}). Quality inspection is positioned before scanning so rejected items never enter WMS inventory — preventing phantom stock.

flowchart TB
  AW["Automated Warehouse"]
  BMS["Building Mgmt and Safety"]
  PDS["Packing and Dispatch"]
  GRS["Goods Receiving"]
  FD["Fire Detection"]
  AC["Access Control"]
  HV["HVAC Monitoring"]
  ES["Emergency Shutdown"]
  BC["BMS Controller"]
  LC["Lighting Control"]
  AP["Packing Station"]
  SL["Label Printer"]
  WD["Weight/Dim Verify"]
  OS["Outbound Sortation"]
  DD["Dock Management"]
  ID["Inbound Dock"]
  QI["Quality Inspection"]
  RS["Receiving Scanner"]
  PA["Put-Away Engine"]
  IC["Inbound Conveyor"]

  AW --> BMS
  AW --> PDS
  AW --> GRS
  BMS --> FD
  BMS --> AC
  BMS --> HV
  BMS --> ES
  BMS --> BC
  BMS --> LC
  FD -->|EN 54 loop| BC
  FD -->|hardwired relay| ES
  AC -->|door release| ES
  HV -->|BACnet/IP| BC
  LC -->|override| ES
  BC -->|zone status| AW
  PDS --> AP
  PDS --> SL
  PDS --> WD
  PDS --> OS
  PDS --> DD
  AP --> SL
  SL --> WD
  WD --> OS
  OS --> DD
  GRS --> ID
  GRS --> QI
  GRS --> RS
  GRS --> PA
  GRS --> IC
  ID --> QI
  QI --> RS
  RS --> PA
  PA --> IC

Analysis

Semantic lint reported 1 high finding: the system-level {{entity:Automated Warehouse}} entity lacks the Physical Object trait despite having physical constraints in {{stk:STK-NEEDS-007}}. This is ontologically correct — the warehouse is classified as a system (abstract), while its physical embodiment is captured by its component entities. Acknowledged and stored.

Cross-domain similarity search on {{entity:Fire Detection and Suppression System}} ({{hex:55F77A58}}) found 96.9% Jaccard match with {{entity:Chemical Dosing Control System}} ({{hex:55F77A18}}) from the water treatment plant decomposition — differing by only 1 trait. Both are safety-critical, regulated, autonomous monitoring-and-response systems with compositional architecture. This validates the BMS decomposition approach: the fire system’s trait profile aligns with other process-safety systems across domains.

103 requirements from prior sessions lack rationale — QC review must address this gap. All 32 requirements created this session include rationale.

Requirements

This session generated 9 BMS subsystem requirements ({{sub:SUB-REQS-045}} through {{sub:SUB-REQS-053}}), 5 packing requirements ({{sub:SUB-REQS-054}} through {{sub:SUB-REQS-058}}), 5 receiving requirements ({{sub:SUB-REQS-059}} through {{sub:SUB-REQS-063}}), 12 interface requirements ({{ifc:IFC-DEFS-024}} through {{ifc:IFC-DEFS-035}}), and 12 verification entries (VER-METHODS-025 through VER-METHODS-036). All IFC requirements have corresponding VER entries with trace links. Architecture decisions recorded for all three subsystems (ARC-DECISIONS-007, 008, 009).

Key safety requirements: {{sub:SUB-REQS-049}} mandates 500ms E-stop response with life-safety systems maintained; {{sub:SUB-REQS-045}} requires zone-specific suppression activation within 60s/10s; {{ifc:IFC-DEFS-025}} specifies fail-safe hardwired relay for fire-to-evacuation interface.

Next

First-pass decomposition is complete. The next session should be a QC review (Flow C) covering all 168 requirements. Priority: backfill rationale for 103 prior-session requirements, verify trace completeness across all SYS→SUB and SYS→IFC links, and check for missing cross-subsystem interfaces (particularly BMS-to-AMR safety interlocks and receiving-to-AS/RS put-away handoff). Duplicate diagram IDs (AS/RS, AMR, WMS each have 2) should be cleaned up during QC.