Industrial HVAC Enterprise Integration Architecture

This blueprint shows an OT/IT segmented architecture for industrial HVAC: deterministic control in OT, secure data bridging through a DMZ, and enterprise integration for analytics, compliance, and ERP. It's designed for production environments where availability, auditability, and security are non-negotiable.

What it visualizes

  • •Field network segmentation (BACnet/Modbus/LoRaWAN)
  • •BMS/PLC/SCADA high-availability control stack
  • •Secure OT/IT gateway, time-series and event processing
  • •Retention policies, backup and recovery SLAs
  • •Cross-layer security model (IEC 62443 / NIST CSF)

Used for

  • •Designing secure integration architecture
  • •Defining interfaces for BI/CMMS/ERP
  • •Compliance planning and audit readiness
  • •Resilience and failover modeling

Industrial HVAC Enterprise Integration Architecture

Multi-Layer OT/IT Segmented Control Model

Layer 1: Physical Layer + Field Network

HVAC Equipment & OT Network Segmentation

Chiller Cluster

3x Units (N+1)

→Modbus RTU
→Redundant Feed
→Field Bus Seg A

AHU Systems

8x Units

→BACnet/IP
→DDC Controllers
→Zone Control

Heat Pump Array

4x Units (Dual Feed)

→Modbus TCP
→N+1 Config
→Backup Power

Wireless Sensor Network

142 Nodes

→Protocol: LoRaWAN
→Edge Aggregation
→Battery Backup

Field Gateway

Edge Processing

→Protocol Conversion
→Data Buffering
→Local Failover

Layer 2: Control Layer - Deterministic Control

BMS / PLC / SCADA | High Availability Architecture

Building Management System

Primary Control | Redundant Server

→BACnet Master Controller
→Scheduling Engine
→Alarm Handling & Logging
→Trend Data Storage
→Redundancy: Active/Standby

PLC Cluster

Process Control | Failover Config

→Deterministic Logic
→Redundant CPU
→Local Override Mode
→Safety Interlocks
→Scan Time: 10ms

SCADA Layer

Supervisory Control

→Real-time Monitoring
→Operator HMI
→Event Acknowledgment
→Historical Trending
→Dual Server Config

Layer 3: Integration Layer - Secure OT/IT Bridge

Data Gateway / Time-Series Storage / Event Processing

Integration Gateway

Secure API Endpoint

→Protocol Normalization
→Data Validation
→Encrypted OT/IT Bridge
→Event Logging
→Rate Limiting

Event Layer

Time-Series Processing

→Time-series Database
→Event Stream Processing
→Alert Routing
→SLA Monitoring
→Data Retention: 24mo hot

Data Retention Policy

Archive Management

→Hot Storage: 24 months
→Archive: 5 years
→Compliance Export
→Backup: Daily
→Recovery SLA: 4h

Layer 4: Application Layer - Business Intelligence

Energy Analytics / Maintenance / Compliance / ERP Integration

Energy Performance Module

Efficiency Analytics

→Load Profile Analysis
→Peak Demand Tracking
→Renewable Ratio
→COP/EER Monitoring

Maintenance Module

Asset Management

→Asset Lifecycle Monitor
→Predictive Alerts
→Service Window Planning
→CMMS Integration

Compliance Module

Regulatory Reporting

→Energy Audit Reports
→ISO/DIN Documentation
→ESG KPI Export
→Automated Compliance

ERP Integration

Financial Interface

→Cost Allocation per Zone
→Energy Billing Interface
→Budget Tracking
→Procurement Sync

Security Architecture - Cross-Layer

OT/IT Network Segmentation & Access Control

Network Segmentation
  • → Segmented VLANs
  • → OT/IT Firewall
  • → DMZ Zone
Access Control
  • → Role-based Access
  • → Multi-factor Auth
  • → Zero-Trust Model
Encryption
  • → TLS 1.3
  • → VPN Tunnel
  • → Data at Rest
Monitoring
  • → Intrusion Detection
  • → Audit Trail Logging
  • → SIEM Integration
Compliance
  • → IEC 62443
  • → NIST CSF
  • → Annual Audit

High Availability Architecture

Redundant BMS Server
Active/Standby failover <30s
PLC Failover Cluster
Hot-standby CPU, auto-switch
Dual Power Feed
UPS backup, 15min runtime
Backup Communication
Redundant network paths
Data Flow Types
Control Flow
BMS → PLC → Equipment
Telemetry Flow
Sensors → Gateway → BMS
External Data
BMS → API → ERP/Reports
Protocol Standards
  • • BACnet/IP (ISO 16484)
  • • Modbus TCP/RTU
  • • OPC UA (IEC 62541)
  • • LoRaWAN (Wireless)
Network Zones
  • • OT Network (Isolated)
  • • DMZ (Gateway Layer)
  • • IT Network (Business)

Architecture Blueprint | System Environment: Production | Revision 2.1 | Compliance Verified

Related system views

System Architecture
Energy layer + HVAC
Performance Intelligence
Real-time monitoring
Compliance Control
Certification matrix