Standard for the Exchange of Product model data

Standard for the Exchange of Product model data. It is an ISO standard (ISO 10303) that provides a comprehensive, vendor-neutral format for the digital representation and exchange of product information across its entire lifecycle. The standard is designed to enable interoperability between diverse computer-aided design systems, product lifecycle management software, and other enterprise applications. Its primary goal is to ensure that complex product data, including geometry, topology, tolerances, and material properties, can be accurately shared and archived without loss of information.

Overview

The standard defines a formal language, EXPRESS, for specifying product data models, which are then used to create physical file formats for data exchange. It is structured as a series of modular parts, each published as an International Standard, covering specific application protocols, implementation methods, and conformance testing frameworks. A core component is the use of Application protocols (APs), which tailor the broad standard to the needs of specific industries, such as automotive design or shipbuilding. The format is widely recognized as a critical enabler for digital manufacturing and is a foundational technology for initiatives like the Industrial Internet Consortium and Industry 4.0.

History and development

Development of the standard began in the 1980s under the auspices of the International Organization for Standardization Technical Committee 184, Subcommittee 4, driven by the need to solve persistent problems in CAD data exchange between incompatible systems from vendors like Dassault Systèmes and Siemens Digital Industries Software. The first official release, known as STEP, was published in 1994. Major milestones include the development of AP203 for configuration controlled 3D designs and AP214 for automotive design processes. Ongoing development is managed by committees with participation from organizations like the United States Department of Defense, Airbus, and Boeing, with recent efforts focused on integrating with standards like the ISO 15926 for process plants and the JT (visualization format) for lightweight visualization.

Technical specifications

The architecture is divided into several series: the 40-series describes integrated resources and application modules, the 200-series defines the Application protocols, and the 300-series covers abstract test suites. Data is typically exchanged using Part 21, which specifies a clear-text ASCII file format with the .stp or .step extension. The EXPRESS information modeling language is defined in Part 11. For geometric dimensioning and tolerancing, it incorporates concepts from standards like ASME Y14.5. Implementation methods also include XML-based formats (Part 28) and access via Application programming interfaces defined in Parts 22 and 27, enabling integration with software from PTC and Autodesk.

Applications and implementations

It is extensively used in major industries for long-term data archiving, supply chain collaboration, and as a neutral format for competitive procurement. In aerospace, companies like Lockheed Martin and Northrop Grumman mandate its use for subcontractor data delivery. The United States Army and Royal Australian Navy utilize it for technical data packages. It supports the entire product lifecycle management process, from conceptual design in systems like CATIA to maintenance and repair. Specific application protocols, such as AP242 for model-based definition, are becoming central to digital thread initiatives. Many computer-aided manufacturing and coordinate-measuring machine software packages can directly import data.

Related standards

It exists within a broader ecosystem of product data standards. It is closely associated with the Initial Graphics Exchange Specification (IGES), an earlier, more geometry-focused format. For additive manufacturing, it interacts with the ASTM ISO/ASTM 52900 standard. In the realm of building information modeling, it relates to the Industry Foundation Classes (IFC) standard, which is itself based on similar principles. Other related standards include ISO 13567 for CAD layer organization, ISO 14306 for the JT (visualization format), and ISO 15531 for manufacturing management data. Its methodologies also influence developments in the Object Management Group's Systems Modeling Language. Category:Computer-aided design Category:ISO standards Category:Data exchange