MES 知识积累

1. Engineering Change Orders (ECO) are used for changes in components, assemblies, or documents such as processes and work instructions. They may also be used for changes in specifications.

ECOs are also called an Engineering Change Note or Engineering Change Notice (ECN) or just engineering change (EC).

In a typical system development cycle, the specification or the implementation is likely to change during engineering development or during integration of the system elements. These last-minute design changes are commonly referred to as engineering change orders (ECOs) and affect the functionality of a design after it has been wholly or partially completed. ECOs can compensate for design errors found during debug or changes that are made to the design specification to compensate for design problems in other areas of the system design.

 2. 首件：每个班次刚开始时或过程发生改变（如人员的变动、换料及换工装、机床的调整、工装刀具的调换修磨等）后加工的第一或前几件产品。对于大批量生产，“首件”往往是指一定数量的样品。

首件检验：对每个班次刚开始时或过程发生改变（如人员的变动、换料及换工装、机床的调整、工装刀具的调换修磨等）后加工的第一或前几件产品进行的检验。一般要检验连续生产的3-5件产品，合格后方可继续加工后续产品。