What is the Industrial Internet of Things (IIoT)?
The Industrial Internet of Things (IIoT) is the network of connected sensors, machines, controllers and software platforms in industrial environments that collects, analyses and exchanges process data in order to produce more efficiently, more safely and more intelligently. IIoT brings data from the shop floor to analytics and business systems without the local control system having to change. It is a core component of Industry 4.0 and one of the main drivers of OT convergence.
🧠 What is the difference between IIoT, IoT and Industry 4.0?
The term Industrial Internet was coined by General Electric in 2012. In March 2014, AT&T, Cisco, GE, IBM and Intel founded the Industrial Internet Consortium, now the Industry IoT Consortium, which published the Industrial Internet Reference Architecture (IIRA) in 2015. Industry 4.0 is the German strategy presented at the Hannover Messe in 2011, and it is broader than connectivity: modular production, digital twins and new business models are part of it too. IIoT is the technical foundation on which Industry 4.0 runs.
Compared with consumer IoT, the requirements are very different:
| Feature | IIoT | Consumer IoT |
|---|---|---|
| Application area | Industry, energy, water, transport, logistics | Smart homes, wearables, household appliances, connected cars |
| Reliability | Highly critical; downtime costs production or safety | Less critical; failure is mainly an inconvenience |
| Lifespan | 10–20 years, often alongside legacy systems | 2–5 years |
| Security requirements | High: protection against sabotage, errors and downtime | Moderate: mainly privacy |
| Data volume | Large and continuous, sometimes thousands of readings per second | Relatively limited and irregular |
| Environment | Vibration, dust, heat, explosion hazards, EMC | Home and office |
🔧 What are the layers of an IIoT architecture?
IIoT connects industrial Assets, such as machines, motors, conveyors and pumps, to analytics and business systems through a layered architecture:
| Layer | Function | Examples |
|---|---|---|
| Devices | Measure physical values and drive processes | Sensors (temperature, vibration, current), actuators, PLCs |
| Edge | Collect, filter and pre-process locally; less Cloud traffic | Edge devices, industrial PCs, edge computing |
| Connectivity | Transport data from OT to IT and the cloud | Gateways, MQTT brokers, 5G, LoRaWAN |
| Platform | Store, contextualise and manage | Historian, Unified Namespace, Cloud or on-premises platform |
| Applications | Analyse, visualise and feed back | Dashboards, MES, predictive maintenance, Industrial AI |
One key principle: control stays local. IIoT reads data out and at most sends advice or setpoints back through controlled routes. A lost internet connection must never leave a process uncontrollable, so Real-time control loops always run in the local controller.
📡 Which protocols and networks does IIoT use?
| Protocol / network | Type | Characteristic |
|---|---|---|
| MQTT | Publish/subscribe messaging | Lightweight and efficient; MQTT 3.1.1 is ISO/IEC 20922, MQTT 5.0 has been an OASIS standard since 2019 |
| MQTT Sparkplug B | Specification on top of MQTT |
Fixed topic structure (spBv1.0/...), Protobuf payload and state management; Sparkplug
3.0 is ISO/IEC 20237:2023
|
| OPC UA | Information model and communication | IEC 62541; semantics, security and client/server or PubSub |
| AMQP | Enterprise messaging | AMQP 1.0 is ISO/IEC 19464; widely used between platform and IT systems |
| LoRaWAN | LPWAN, licence-free band (868 MHz in Europe) | Small data packets, 2–5 km in cities up to 15 km or more in rural areas |
| NB-IoT and LTE-M | Cellular LPWAN | Standardised in 3GPP Release 13 (2016); battery life of up to around ten years |
| 5G | Cellular broadband | Low latency and private campus networks for mobile robots and AGVs |
On the shop floor itself, existing fieldbuses and industrial Ethernet deliver the data; a gateway or edge device translates it into MQTT or OPC UA. For brownfield installations this is the usual route, because existing machines rarely speak IIoT protocols themselves.
🏭 What is IIoT used for?
- Predictive Maintenance - replacing parts before they fail, based on vibration, temperature and current draw
- Condition Monitoring - real-time monitoring of motors, pumps and compressors
- OEE and production performance - measuring availability, performance and quality automatically; 85% is often cited as world class
- Smart energy management - metering consumption per machine, reducing peak load and underpinning an energy management system in line with ISO 50001
- Quality monitoring - linking process parameters to batch or serial numbers
- Remote assets - reading pumping stations, wind turbines and tanks via LoRaWAN or cellular networks
- Smart factory - connected production assets that work together with MES and ERP
🧰 Which IIoT platforms are available?
IIoT platforms fall into three groups:
- Hyperscaler platforms - services from the large cloud providers for device management, storage and analytics
- Industrial platforms - solutions from automation vendors such as Siemens, Schneider Electric, Rockwell Automation and AVEVA, with ready-made connections to their own controllers
- Open and on-premises options - Ignition, Node-RED, Mosquitto as an MQTT broker and InfluxDB as a time series database
Watch out for lock-in when choosing: Google shut down Cloud IoT Core on 16 August 2023, forcing users to migrate. Open standards such as MQTT, Sparkplug and OPC UA make a switch much easier.
🔐 What are the biggest security risks of IIoT?
IIoT systems are directly connected to physical processes, so an attack can lead to downtime, damage or unsafe situations. The best-known risks:
- Default passwords - in 2016 the Mirai botnet took over hundreds of thousands of IoT devices using factory credentials
- Weak device identity - devices without a unique identity or certificate are easy to impersonate
- Missing updates - Firmware goes unpatched for years, or updates are not signed
- Direct internet exposure - gateways that are directly reachable, or connections that bypass segmentation
- Supply chain - unknown software components in devices and platforms
Key security measures:
- Network segmentation based on the Purdue Model and the zones and conduits model, with a DMZ between OT and the cloud
- Outbound connections instead of inbound ports into the plant
- Encrypted communication with TLS or VPN
- Device authentication with unique X.509 certificates and Certificate Management
- Secure Boot, signed updates and patch management
- An SBOM per device and compliance with IEC 62443, in particular IEC 62443-4-2 for components
⚖️ Which EU legislation applies to IIoT?
| Law / standard | What it requires for IIoT | Key dates |
|---|---|---|
| RED + EN 18031 | Cybersecurity requirements for wireless, internet-connected equipment, such as no universal default passwords and secure updates | Requirements mandatory since 1 August 2025; EN 18031 gives presumption of conformity |
| Cyber Resilience Act | Security by design, no known exploitable vulnerabilities at delivery, security updates throughout the support period and an SBOM | Reporting obligations since 11 September 2026; fully applicable on 11 December 2027 |
| Data Act | Users get access to the data from their connected machines and may share it | Applicable since 12 September 2025; design obligation for new products since 12 September 2026 |
| NIS2 | Duty of care and incident reporting for essential and important entities that use IIoT | Transposed in the Netherlands through the Cyberbeveiligingswet |
Since 11 September 2026, manufacturers must send an early warning about actively exploited vulnerabilities to ENISA and the national CSIRT within 24 hours, followed by a notification within 72 hours and a final report within 14 days after a fix is available. As a buyer, this means you can require in tenders that IIoT equipment demonstrably complies with RED and the CRA.
🧭 How do you implement an IIoT project step by step?
- Start from a business problem - for example unplanned downtime of one critical pump, not “connect everything”.
- Inventory assets and data sources - which controllers, protocols and sensors are already in place, and what is missing?
- Choose the architecture - edge or cloud, brownfield or greenfield, and a shared data structure such as a Unified Namespace.
- Design security up front - zones, conduits, outbound connections and certificate management; carry out a risk assessment in line with IEC 62443-3-2.
- Start with a pilot - one line or site, with a measurable goal such as a percentage less downtime or energy consumption.
- Arrange management and ownership - who manages gateways, certificates and updates: IT, OT or the vendor? Record data agreements with the Data Act in mind.
- Scale up in phases - standardise naming, data models and installation procedures before rolling out to other lines.
❓ Frequently asked questions
What does IIoT stand for?
IIoT stands for Industrial Internet of Things. It refers to connected sensors, machines and systems in industry that collect and exchange data for analysis and optimisation. Unlike consumer IoT, IIoT focuses on reliability, safety and a long service life.
Is IIoT the same as Industry 4.0?
IIoT is not the same as Industry 4.0, but it is its technical foundation. Industry 4.0 is a broader vision of digital manufacturing that includes digital twins, modular production and new business models. IIoT provides the connected devices and data flows on which that vision runs.
Which protocol is most widely used for IIoT?
MQTT and OPC UA are the most widely used protocols for IIoT. MQTT is lightweight and scalable and in industry is often combined with Sparkplug B for a fixed data structure. OPC UA offers a rich information model and built-in security, and is widely used between machines and edge devices.
Does IIoT data have to go to the cloud?
IIoT data does not have to go to the cloud. Many organisations process data locally on edge devices or an on-premises platform and send only aggregated data to the cloud for long-term analysis. Control of the process itself always stays local.
Which laws apply to IIoT devices?
In the EU, IIoT devices are subject to the Radio Equipment Directive with EN 18031 for wireless equipment, the Cyber Resilience Act for all products with digital elements, and the Data Act for access to machine data. Organisations that use IIoT in essential sectors also fall under NIS2.
How do you secure IIoT devices?
You secure IIoT devices with a unique identity per device, no default passwords, signed firmware updates and encrypted connections. Place them in a segmented network with only outbound connections to the platform. IEC 62443-4-2 and EN 18031 set out concrete requirements for components.
📌 In summary
IIoT is the application of connected sensors, edge devices and data platforms in industrial environments, enabling companies to monitor, analyse and optimise their processes in real time. Open protocols such as MQTT, Sparkplug B and OPC UA, a segmented architecture based on IEC 62443 and compliance with RED, the Cyber Resilience Act and the Data Act make IIoT scalable and secure.