On the use of GPSS to model hierarchical control systems in a manufacturing environment

  • Authors:
  • Ronald J. Degen;Thomas J. Schriber

  • Affiliations:
  • -;-

  • Venue:
  • WSC '76 Proceedings of the 76 Bicentennial conference on Winter simulation
  • Year:
  • 1976

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Abstract

The concept of hierarchical, multilevel control systems is reviewed in the context of manufacturing systems, and the strata typically composing such control systems are discussed. The possibility of building simulation models of hierarchical systems, using FORTRAN routines to represent the higher-level strata, and GPSS to model the actual manufacturing steps themselves, is introduced. A hypothetical, nine-product toy-manufacturing system is described, and some of the specific features of a GPSS-FORTRAN package which successfully models this system in accord with hierarchical control principles are indicated. The relative ease of constructing the GPSS-FORTRAN model suggests that there may be substantial potential in this approach for assessing the properties of specific proposed hierarchical control systems. Such models can be used initially to investigate the relative goodness of various control algorithms which are candidates for use in these systems; then, after selection of a specific control algorithm or combination of algorithms, the models can be used further to test and evaluate the control software and data bases created to support the operation of such systems.