Download e-book for iPad: CIM Computer Integrated Manufacturing: Computer Steered by August-Wilhelm Scheer

By August-Wilhelm Scheer

Modern details know-how has unfolded new chances of flexibilization and price relief in creation. the writer defines CIM - laptop built-in production - as an idea for the structuring of business organizations. production applied sciences call for a CIM notion which are learned in the course of the features of knowledge processing on hand this day. the belief of integrating assorted components of CIM, similar to construction making plans and keep watch over (PPC), desktop aided layout (CAD) and computing device aided production (CAM), is defined via working chains and placed right into a CIM structure in response to a hierarchy of EDP platforms. The stance taken during this booklet of defining CIM as a complete idea for commercial agencies is more and more gaining flooring. The publication doesn't target to place the practical information of the person CIM elements (PPC, CAD, CAP and CAM) within the foreground, yet relatively to stress the combination rules for the sensible calls for of the person parts. This publication seemed within the Federal Republic of Germany in 1987, and inside of twelve months it had run to 3 variants. the writer contributes to this e-book not just his clinical wisdom but additionally his event as a specialist for imposing CIM concepts.

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Product structure Fig. v. 6 Decentralization On the basis of the intensified development of control units arising from the new information technology, PPC systems must increasingly concern themselves with questions of organization of control centers, control of flexible production systems, etc. This gives rise to small independent feedback loops, which must, however, be tied to higher level supply systems. For the moment this statement of the problem must suffice: the entire question will be considered much more intensively in future CIM discussions.

The system can embrace the entire logistic chain down to a process specific production overview. The differences between actual and planned values, and their interpretation as advance and arrears (expressed either in quantity or time units), make clear-sighted control of the enterprise possible. In particular, the consequences of changes can easily be highlighted. The running total concept, therefore, represents an effective extension of present production planning and control methods. In determination of planned running totals, for component requirements, for example, it makes use of standard requirement assessment methods.

A logistic concept based on running totals can access a multiplicity of reference groups for which running totals can be calculated. For example, these may be: Planned Actual Call-off running totals Shipping running total Production plan running total Assembly running total 33 I r-------/ Actual cUlIlJlative I,: output I Advance in =~of ~ ~ I . , _Advance in days r-----------J ,----- ------'. 1'1 r 'Planned clIIlIlative I I output I I f Present ... Days Fig. I -11: Running total diagram Inventory level figures are given by the difference in the running totals of inventory additions and inventory withdrawals.

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