Industry 4.0 Networking: IT/OT Convergence
·3 min read·403 words
The Industry 4.0 network (OT — Operational Technology) combines industrial computing (SCADA, PLCs, automation controllers) with modern IT (IoT, cloud, AI). Security is critical: targeted attacks (TRITON, Industroyer, Stuxnet) + NIS2 compliance + ISA/IEC 62443. 2026 industrial architecture guide.
Purdue Model (levels)
- Level 5: Enterprise (ERP, CRM, office)
- Level 4: Site Business Network (MES, historian, plant IT)
- Level 3.5: Industrial DMZ (jump servers, patch relay)
- Level 3: Operations Management (SCADA HMI, engineering workstations)
- Level 2: Supervisory Control (DCS, SCADA servers)
- Level 1: Process Control (PLC, RTU, IED)
- Level 0: Process (sensors, actuators, motors)
Industrial protocols
- Modbus TCP: port 502, legacy, unencrypted
- DNP3: energy, water
- OPC UA: modern, TLS-encrypted, multi-vendor
- EtherNet/IP: Rockwell/Allen-Bradley
- PROFINET: Siemens
- MQTT/Sparkplug: modern industrial IoT
- IEC 61850: electrical substations
Mandatory IT/OT segmentation
- Industrial DMZ (Level 3.5): between IT and OT
- IT/OT firewall: Palo Alto, Cisco FTD, FortiGate with OT features
- Data Diode for critical unidirectional communications
- No direct connection from office PCs to PLCs
Industrial hardware
- Cisco IE3300/IE3400/IE4000: DIN-rail industrial switches, -40°C to +75°C
- Hirschmann BOBCAT: switches from industrial leader Belden
- Moxa EDS: industrial PoE switches
- Siemens SCALANCE X: industrial managed switches
- Westermo: Swiss, rugged
OT security
- Visibility: Cisco Cyber Vision, Claroty, Nozomi, Dragos
- Industrial IDS: PLC anomaly detection
- Patch management: infrequent maintenance windows (1-2/year)
- Air-gapped? Often not in practice, so plan for microsegmentation
- Dedicated OT SOC: detection of specific events (Stuxnet-like)
Compliance
- IEC 62443: industrial security standard (zones + conduits)
- NIS2: EU directive (energy, critical manufacturing)
- NIST SP 800-82: OT security framework
- CaRE: French directive for critical infrastructure
Plant connectivity
- OS2 single-mode industrial fiber for long links (>500m)
- Shielded cat 6A copper (STP) in EMI environments
- Industrial WiFi 6 (Cisco CW9124, Moxa AWK): AGVs, tablets
- Private 5G: mobile robots, high-performance AGVs (Siemens, Nokia, Ericsson)
- LoRaWAN: temperature/vibration sensors
Typical plant architecture
- IT core: Cisco Nexus 9300 or FortiGate
- IT/OT FW: Palo Alto PA-3400 + zones
- OT core: Cisco IE9300 or Hirschmann MACH1040
- OT access: Cisco IE3400 DIN-rail per cell
- Industrial WiFi 6: Cisco CW9124 or Moxa AWK-4262A
- Monitoring: Cisco Cyber Vision
Mid-sized plant budget
- 100 IE3400 switches + 20 IE9300 switches: ~€350,000 excl. VAT
- PA-3440 IT/OT firewall: ~€40,000 excl. VAT
- Cyber Vision licenses: ~€80,000 excl. VAT/year
- Industrial WiFi, 30 APs: ~€35,000 excl. VAT
- Integration services: ~€150,000 excl. VAT
- Total project cost: ~€650,000 excl. VAT
Order from OPTINOC
Turnkey Industry 4.0 networking. Cisco IE + Cyber Vision + IT/OT FW. IEC 62443 + NIS2 compliance. Existing-environment audit. Plant quotation within 1 week.