A formal functional characterization of shop floor control

Abstract Shop-floor control systems for discrete part manufacturing have been widely described by many researchers. These descriptions have led to several proposed frameworks to solve the overall shop floor control problem. Some terms commonly used to describe these frameworks include: centralized control, hierarchical control, heterarchical control, and hybrid control. However, these frameworks have not provided a formal generic vision of shop floor control. Rather, they have concentrated on specific implementations of the problem, or small classes of similar implementations. As a result, the frameworks which have been developed are applicable only to a subset of the problem domain. By contrast, a solution to the general shop floor control problem is highly desirable. It is only after the general shop floor problem is understood that such a general solution can be developed. In response to this need, this paper presents a formal functional characterization of the general shop floor control problem. Key to our functional characterization of the controller is the use of process plans as part of the control. We use a process plan representation model compatible with the ISO TC184/SC4/WG3/P11 proposed standard as part of the control input. The ISO process plan model is converted to a digraph which provide the task representation for control. In this paper, we illustrate how these digraphs provide the essential requirements for input to and for a functional characterization of shop floor control.

[1]  Jeffrey S. Smith,et al.  Formal models for control of flexible manufacturing cells: physical and system model , 1995, IEEE Trans. Robotics Autom..

[2]  Albert T. Jones,et al.  A functional approach to designing architectures for CIM , 1989, IEEE Trans. Syst. Man Cybern..

[3]  J. R. Jackson.  Networks of Waiting Lines , 1957 .

[4]  C. McLean,et al.  A proposed hierarchical control model for automated manufacturing systems , 1986 .

[5]  Jeffrey S. Smith,et al.  Process planning interface for a shop floor control architecture for computer-integrated manufacturing , 1995 .

[6]  R. A. Volz,et al.  Design of integrated manufacturing system control software , 1987, IEEE Transactions on Systems, Man, and Cybernetics.

[7]  S. M. Johnson,et al.  Optimal two- and three-stage production schedules with setup times included , 1954 .

[8]  Dirk Beeckman,et al.  CIM-OSA: computer integrated manufacturing—open system architecture , 1989 .

[9]  Edward J. Barkmeyer,et al.  Manufacturing Systems Integration Initial Architecture Document , 1991 .

[10]  Richard A. Wysk,et al.  Automatic generation of control software in computer-integrated manufacturing , 1989 .

[11]  Neil A. Duffie,et al.  Non Hierarchical Control of a Flexible Manufacturing Cell , 1987 .

[12]  James S. Albus,et al.  Theory and Practice of Hierarchical Control , 1981 .

[13]  Albert Jones,et al.  A multi-leve/multi-layer architecture for intelligent shopfloor control , 1990 .

[14]  Albert Jones.  Proceedings of CIMCON '90 , 1990 .

[15]  Jeffrey S. Smith,et al.  A Shop-Floor Control Architecture for Computer-Integrated Manufacturing , 1996 .

[16]  Steven R. Ray,et al.  ALPS: A Language for Process Specification , 1991 .

[17]  Hyunbo Cho,et al.  A Formal Approach to Integrating Computer-Aided Process Planning and Shop Floor Control , 1994 .

[18]  Richard A. Wysk,et al.  Detection of deadlocks in flexible manufacturing cells , 1991, IEEE Trans. Robotics Autom..