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92 SMT Magazine • November 2015 PCB product model between organizations and the use of a common component-model stan- dard for deriving the machine-level library con- tent for any assembly line or factory. Figure 11 shows links between component vendor name plus part number and the models in the same library as was described in the above discussion of portable DFA. The result is that, in the context of any as- sembly line or factory, the model of the prod- uct to be assembled will be identical. Figure 12 shows an example of the PCB product model, after identification of the parts and integration of their models from the cloud-based library. You see the exact outlines of the component bodies, their physical pin contacts on the PCB, of course also linked to the data that is embed- ded in the component-model name itself. Second requirement A classification system is required that can relate to any specific machine requirements to take the step from the general model of the part shown in the previous section to a machine- specific model of the part. After reviewing the libraries of the mainstream pick-and-place, AOI, AXI, and structural test machine vendors, we built a classification system as illustrated in Figure 13. From left to right, 24 component package classifications are shown for which ma- chine-specific content can be derived. The rows in the table define the specific library content required by a particular widely used pick-and- place machine; the green cells are all instances where specific content is required for that ma- chine to handle components of a particular clas- sification. Thus, the purpose of the individual rows will vary according to the requirements of any particular machine, as will the definition of which classifications need each type of content (marked in green). Each green square in the matrix can have its own unique derivation rule(s) to be applied when generating the content for that specific machine. To illustrate, we can take the example of a simple five-pin gullwing component. The figure 12: component body and pin-contact models, integrated into the pcb product model. STreAmLINING PCb ASSembLy AND TeST NPI WITH SHAreD ComPoNeNT LIbrArIeS arTIcLe