TAILIEUCHUNG - Manufacturing Design, Production, Automation, and Integration Part 15

Tham khảo tài liệu 'manufacturing design, production, automation, and integration part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 15 Supervisory Control of Manufacturing Systems The focus of this chapter is the autonomous supervisory control of part flow within networked flexible manufacturing systems FMSs . In manufacturing industries that employ FMSs automation has significantly evolved since the introduction of computers onto factory floors. Today in extensively networked environments computers play the role of planners as well as that of high-level controllers. The preferred network architecture is a hierarchical one in the context of production control a hierarchical network of computers distributed on the factory floor have complete centralized control over the sets of devices within their domain while receiving operational instructions from a computer placed above them in the hierarchical tree. In a typical large manufacturing enterprise there may be a number of FMSs each comprising in turn a number of flexible manufacturing workcells FMCs Fig. 1 . These FMCs will be connected via intercell material handling systems such as automated guided vehicles AGVs and conveyors Chap. 12 . FMCs have been commonly configured for the fabrication and or assembly of families of parts with similar processing requirements. A traditional FMC comprises a set of programmable manufacturing devices with their own controllers that are networked to the FMC s host computer for the downloading of production instructions programs as well as to a supervisory controller for the autonomous control of parts flow Fig. 2 . Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. FMS 1 FMS host computer I Communication network bus ị M II 11 11. 1 1 Host PC 1 Ị Host PCj 1 Host PC FMC 1 FMC 2 FMC n It t I ị - ị- Intercell material handling system FMS 2 FMS host computer 2 FMS r FMS host computer r Figure 1 A networked manufacturing environment. Figure 2 A flexible manufacturing workcell. FMS communication bus Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. Although human operators have been traditionally used

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