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IEC 62935: Smart Manufacturing: Reference Architecture Model for Industrial Digital Transformation
IEC 62935 | Engineering Insight Article
Key Insight: IEC TR 62935 establishes a unified reference architecture model that harmonizes concepts from RAMI 4.0 (Germany), IVRA (USA), and other national smart manufacturing frameworks into a single internationally recognized architectural blueprint for industrial digital transformation.
The Need for a Unified Smart Manufacturing Architecture
The fourth industrial revolution, commonly known as Industry 4.0 or smart manufacturing, has fundamentally transformed how industrial production systems are designed, operated, and maintained. However, the rapid emergence of competing architectural frameworks — including Germany’s RAMI 4.0 (Reference Architecture Model Industrie 4.0), the United States’ IVRA (Industrial Internet Reference Architecture), Japan’s IVRA, and China’s national smart manufacturing standards — created a fragmented landscape that hindered cross-border interoperability and collaboration.
IEC TR 62935, developed by IEC TC 65 (Industrial-process measurement, control and automation), addresses this fragmentation by providing a comprehensive technical report that synthesizes these diverse frameworks into a harmonized reference architecture for smart manufacturing. The report serves as a foundational document that enables system architects, engineers, and enterprise decision-makers to design manufacturing systems that are interoperable, scalable, and future-proof.
The reference architecture is built on three primary dimensions: the hierarchy levels dimension (from product to connected world), the life cycle and value stream dimension (from design to recycling), and the architectural layers dimension (from physical assets to business functions). This three-dimensional model provides a structured approach for describing, analyzing, and implementing smart manufacturing systems.
Engineering Challenge: One of the most significant challenges in smart manufacturing is semantic interoperability — ensuring that data exchanged between different systems and layers carries consistent meaning. IEC TR 62935 addresses this by defining standardized information models and communication patterns across all architectural layers.
Architectural Dimensions and Hierarchical Levels
The reference architecture comprises six hierarchical levels that span the entire manufacturing enterprise, from the physical production process to the global connected enterprise:
| Hierarchy Level | Description | Key Functions |
|---|---|---|
| Product | Physical item being manufactured | Product identification, status tracking, quality characteristics |
| Field Device | Sensors, actuators, and local I/O | Process measurement, signal conditioning, basic control loops |
| Control Device | PLCs, DCS, CNC controllers | Logic control, motion control, process regulation, safety functions |
| Station / Work Center | Production cell, assembly station | Cell coordination, material handling, production scheduling |
| Plant / Enterprise | Entire manufacturing facility | MES, ERP integration, production planning, quality management |
| Connected World | Cross-enterprise ecosystem | Supply chain integration, cloud services, collaborative manufacturing |
Each hierarchy level interacts with the architectural layers — physical assets, integration, communication, information, functional, and business — through well-defined interfaces. The integration layer is particularly critical as it bridges the physical and digital worlds, providing a real-time digital twin of the physical manufacturing process.
Life Cycle and Value Stream Management: The architecture incorporates the complete product and factory life cycle, from initial design and prototyping through production, maintenance, and eventual decommissioning or recycling. This life cycle perspective ensures that information generated during early design phases remains accessible and usable throughout the operational life of the manufacturing system. The standard distinguishes between the “type” life cycle (design and prototyping of production systems) and the “instance” life cycle (actual production operation), a concept borrowed from RAMI 4.0 that enables clear separation between planning and execution.
Engineering Design Insight: When implementing smart manufacturing systems, engineers should prioritize the communication and information layers as the backbone of the architecture. The communication layer enabling deterministic, real-time data exchange (using technologies like OPC UA, PROFINET, and TSN), combined with the information layer providing semantic data modeling (using AutomationML or Asset Administration Shell), creates the foundation for all higher-level smart manufacturing functions including predictive maintenance, digital twins, and AI-based optimization.
Interoperability and Integration Patterns
IEC TR 62935 dedicates significant attention to interoperability, identifying four distinct levels that manufacturing systems must achieve: technical interoperability (physical and network connectivity), syntactic interoperability (data format compatibility), semantic interoperability (consistent meaning of exchanged data), and organizational interoperability (aligned business processes and workflows).
The report describes several integration patterns that address these interoperability levels:
Vertical Integration: Connecting all hierarchy levels within a single plant, from field devices to enterprise systems. This pattern ensures that production data flows seamlessly from the shop floor to the top floor, enabling real-time visibility and coordinated decision-making. The standard recommends OPC UA as the preferred communication protocol for vertical integration due to its built-in security, information modeling capabilities, and platform independence.
Horizontal Integration: Connecting systems across the entire value chain, from suppliers to customers. This pattern enables collaborative manufacturing, just-in-time supply chains, and end-to-end traceability. The standard emphasizes the importance of standardized data exchange formats (such as IEC 62714 AutomationML for plant engineering data) and semantic interoperability for successful horizontal integration.
End-to-End Engineering: Connecting all life cycle phases, from product design through manufacturing engineering, production, and service. This pattern ensures that engineering data is consistently maintained and accessible across all phases, eliminating the traditional “islands of automation” that plague manufacturing enterprises.
| Integration Pattern | Scope | Key Standards | Primary Benefit |
|---|---|---|---|
| Vertical Integration | Field to Enterprise | IEC 62541 (OPC UA), IEC 61131 (PLC), IEC 61784 (fieldbus) | Real-time visibility, data-driven decisions |
| Horizontal Integration | Supplier to Customer | IEC 62714 (AutomationML), IEC 62264 (ISA-95), MQTT | Supply chain optimization, traceability |
| End-to-End Engineering | Design to Recycling | IEC 62890 (life cycle), ISO 10303 (STEP), AutomationML | Digital continuity, reduced time-to-market |
Implementation Warning: The report cautions against attempting full-scale smart manufacturing implementation as a single project. Instead, it recommends an incremental approach — starting with vertical integration within a single production cell, then expanding horizontally across the plant, and finally connecting to the enterprise and external ecosystem. This phased approach reduces risk and allows organizations to build capability and experience progressively.
The reference architecture also addresses crucial non-functional requirements including security (recommending IEC 62443 for industrial automation and control system cybersecurity), reliability (leveraging IEC 61508 for functional safety), and maintainability (following IEC 60300-3-14 for maintenance and maintenance support). These cross-cutting concerns must be addressed at every architectural layer to ensure a robust and trustworthy smart manufacturing system.
Frequently Asked Questions
Q1: How does IEC TR 62935 relate to RAMI 4.0?
IEC TR 62935 harmonizes RAMI 4.0 (Germany), IVRA (USA), and other national frameworks into a single international reference architecture. While RAMI 4.0 focuses primarily on the manufacturing domain within the German Industrie 4.0 context, IEC TR 62935 has a broader international scope and incorporates additional perspectives from other national and industry-specific frameworks.
Q2: What is the role of the Asset Administration Shell (AAS) in this architecture?
The Asset Administration Shell is the digital representation of a physical or logical asset throughout its life cycle. It serves as the implementation vehicle for the information layer in the IEC TR 62935 architecture, providing standardized access to asset data and functions. The AAS concept is closely aligned with the information model requirements defined in the reference architecture.
Q3: Can the reference architecture be applied to existing brownfield plants?
Yes. The architecture is designed to support incremental migration from legacy systems. The hierarchy levels and integration patterns can be applied selectively, starting with specific production cells or processes. The standard recommends using gateways and adapters to bridge legacy protocols (such as Modbus or PROFIBUS) with modern communication infrastructure during the transition period.
Q4: How does the architecture address edge computing and cloud integration?
The Connected World hierarchy level encompasses cloud services, edge computing platforms, and cross-enterprise collaboration. The standard recognizes edge computing as a critical architectural component for latency-sensitive applications, with cloud services handling large-scale data analytics and enterprise-wide optimization. The communication layer must support both deterministic local networks (e.g., TSN) and wide-area networks (e.g., 5G) to enable this distributed architecture.
