Design and Analysis of Integrated Manufacturing Systems (1988) / Chapter Skim
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Designing an Information System for Integrated Manufacturing Systems
Designing an Information System for Integrated Manufacturing Systems
Pages 60-78
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From page 60... ...
This paper describes a process by which complex integrated manufacturing systems can be systematically planned. It discusses how the information system that will support the integrated system can be planned, including anticipating the need to make modifications to accommodate future possible changes in both technology and function.
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From page 61... ...
Managers of manufacturing enterprises face a demanding complexity of individual functions as they attempt to achieve their business objectives. A process, not just a program, is required to achieve corporate goals and objectives.
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Enterprise functions Design Production User ~ _ FIGURE 2 Manufacturing enterprise view. ULRICH FLATAU ~ Environment Let us take a closer look at what integration means in the context of an information system.
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From page 63... ...
A logical goal for data integration should be to achieve a single data name and a single data value definition for each of the four entities in the system. Adding the next element, the process, adds two more distinct quantities for each state, thus requiring eight distinct values for the name, value, and process description of the system.
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From page 64... ...
As shown in Figure 3, there is system-to-system, program-to-progran~, and program-to-data communication. These fundamental means of communicating can be implemented in three different modes: the batch or buffered mode, the segmented or partly buffered mode, and the real-time mode with immediate response.
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From page 65... ...
Obtaining access to a remote data base is very tricky using a netNode B Appilcatlon I ~ Application ~ I Application RPTP RDMA LDBA RDBA DMA - Direct memory access LDBA - Local data base access PTP - Program to program RDBA - Remote data base access RDMA - Remote memory access RPTP - Remote program to program
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From page 66... ...
There may be many good reasons to accept an inte grated system design with multiply defined processes and multiply defined data names and data values, but it is essential that the integration strategy include a procedure by which data and process consistency is en sured. There are two basic philosophies to achieve the desired consistency a pull sys tem, which requires the receiver to ask the sender for data, or a push system, in which the sender initiates transfer to the receiver.
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From page 67... ...
able improvements to occur in the opera- Digital Equipment Corporation's CIM sys tem architecture will be used as an example of how this problem can be approached (Digital Equipment Corporation, 1986~. The balance of this paper concentrates on the formal system that relies on procedures, protocols, and detailed specifications for its success.
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From page 68... ...
If product developers agree on standards, the development of subelements can be done in parallel, thereby shortening ULRICH FLATAU the implementation time and reducing the cost of the system. Systems can be implemented one piece at a time, with confidence that system extension is possible and easy to accomplish.
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From page 69... ...
Before applying specific techniques such as structural analyses and design techniques to identify the system activities and the data needs, one must first define the boundaries of integration. Then it is necessary to decompose the system into relevant functional subsystems and to define the basic business functions and entities.
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From page 70... ...
" One goal of the architecture is to make independent, to the extent that it is possible, the business functions from the technology functions. As noted earlier, the business model changes slowly for a company, whereas the technol
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From page 71... ...
analysis cons. BOM drawing 1 l Enginoorlng change control Per-product | r Hardwaro | I costing I l model l | Reloase l r Drawing~ | To Procoss Planning and Schodullng | Part geometry/ 1 material —I r 1 , ECO Request BOM ontry coding and numborlng ~<_ ~ Product | design I On-llne data entries Engineerlng drawing data BOM : ~ : 1 ~ 1 1 1 ~ 1 | Tool data I l r I 7 | | Where used | | retrievals - I Part do11nitlon ~ / | Blil of I filo-malatenanco +~ | material | | (BOM)
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From page 72... ...
Interfaces are rules for the physical communication between dissimilar layers or sublayers. The interfaces handle communication between dissimilar layers, provide access to service from the lower layers, define rules for service access from higher layers, and handle
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From page 73... ...
The processing layer provides resources for process execution. The processing layer supports the execution of system management processes, application processes, and application management processes.
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From page 74... ...
These different subsystems administrative operations, graphical interactions, number crunching, batch processing, transaction processing, and real-time control represent different user groups with unique requirements of the supporting information technology. The users of these subsystems execute administrative operations, work with interactive graphics, execute CPU-intensive processes, work on transaction processing systems, and operate in the real-time environment.
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From page 75... ...
. Operating system l T GKS PHIGS Analysis Processing layer Planning Decision making Data storage and I COD retrieval layer T l working layer )
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Vlslon-System Barcode CMM Sensors NC-Machines ~ Robots Readers Terminals User layer Processinglayer | RS 494 BCL Data storage and retrieval layer r T , MAP Networking layer | Ethernet, DECnet Proway Operating system Hardware Processing Support - Logic Operation · Scanning ~ Interrupt Support FUGUE 14 Real-time user profile.
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From page 77... ...
strategy I ~ L Data met. strategy | Q O Network strategy Hardware strategy l Strategic Information Technology Plan Strat~lc plans for data structure definition Technology independent FIGURE 16 Strategic planning for computer-integrated manufacturing.
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From page 78... ...
Management must agree on strategies for hardware operating systems, user interfaces, application data manage ment, and networking for all five different user profiles. Therefore, management must take the lead in developing a strategic infor mation technology plan.
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