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Step (Iso 10303)STEP or the Standard for the Exchange of Product model data (ISO 10303) is an International Standard for the computer-interpretable representation and exchange of industrial product data. The objective is to provide a mechanism that is capable of describing product data throughout the life cycle of a product, independent from any particular system. The nature of this description makes it suitable not only for neutral file exchange, but also as a basis for implementing and sharing product databases and archiving. Typically STEP can be used to exchange data between CAD, CAM, PDM/EDM and other systems CAx. STEP is addressing product data from various industries such as mechanical, automotive, aerospace, building construction, ship, oil & gas, process plants and others. STEP is developed and maintained by the ISO technical committee TC 184, Technical Industrial automation systems and integration, sub-committee SC4 Industrial data. Like other ISO and IEC standards STEP is copyright by ISO and is not freely available. Structure Main article: List of STEP parts STEP is divided into many parts, grouped into - Environment
- Parts 1x: Description methods: EXPRESS, EXPRESS-X
- Parts 2x: Implementation methods: STEP-File, STEP-XML, SDAI
- Parts 3x: Conformance testing methodology and framework
- Integrated data models
- Parts 4x and 5x: Integrated generic resources
- Parts 1xx: Integrated application resources
- Parts 5xx: Application integrated constructs (AIC)
- Parts 1xxx: Application modules (AM)
- Top parts
- Parts 2xx: Application protocols (AP)
- Parts 3xx: Abstract test suites (ATS) for APs
- Parts 4xx: Implementation modules for APs
STEP is primarily defining data models using the EXPRESS modelling language. Application data according to a given data model can be exchanged either by a STEP-File, STEP-XML or via shared database access using SDAI. The top data models to be used for data exchange are defined in the APs and are based from lower level data models (4x, 5x, 1xx, 5xx and 1xxx) are combined STEP is defining two different types of data models, the Application Integrated Models (ARM) and the Application or Module Integrated Models (AIM, MIM). The simplified and incomplete ARM models define application objects from a users perspective. The integrated models are based on a common set of generic objects, allowing interpretability between different kinds of industries and life cycle stages. History The development of STEP started in 1984 as a successor of IGES, SET and VDAFS. In 1994/95 ISO publishes the initial release of STEP as international standards (IS) with the parts 1, 11, 21, 31, 41, 42, 43, 44, 46, 101, AP201, AP203. Today AP203 Configuration controlled 3D design is supported by many CAD systems for import and export. With the second major release which ended in the year 2002 STEP addresses specific needs of various industry areas (AP202, 209, AP210, AP212, AP214, AP224, AP225, AP227, AP232). From the year 2004 on STEP APs starts using a modular architecture for both ARM and AIM using application modules (1xxx, 4xx). STEP is closely related with PLIB (ISO 13584, IEC 61360). External links Related articles * List_of_STEP_%28ISO_10303%29_parts
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