Glossary · Automation fundamentals, platforms and components
Computer-aided design (CAD)
Also known as: CAD
German: CAD
In engineering, computer-aided design (CAD) is the use of software to create, modify and document 2D drawings and 3D models of parts, assemblies, electrical systems and plants.
- Automation components
In one sentence
Computer-aided design (CAD) is the use of software to create 2D drawings and 3D models of parts, assemblies, electrical systems and plants.
Example
The technical illustrator exports an exploded view from the 3D CAD assembly and uses it for the spare parts list in the maintenance manual.
How it applies
- Engineering: Mechanical CAD (MCAD) produces part and assembly models; electrical CAD (ECAD) produces circuit diagrams and cabinet layouts. Models are usually managed in a PDM or PLM system.
- Documentation: CAD data is a major source for technical illustrations, spare parts catalogs and installation drawings. Documentation teams should reference the CAD revision they used, so illustrations can be updated when the design changes.
- Change control: When CAD models change, linked documents need review; a Digital thread or PLM links help find affected illustrations.
CAD vs. model-based engineering
CAD describes geometry and connections. Model-Based Engineering (MBE) and Model-Based Systems Engineering (MBSE) use models as the primary source for requirements, behavior and structure as well. CAD models are one kind of model in such an approach, not the whole of it.