Four Models of Job Control
نویسندگان
چکیده
In a distributed object oriented hierarchical shop control system there are many ways of organizing the interactions between supervisory controllers and subordinate controllers De pending on what model of job control is used objects will be allocated di erently among the levels of control and the interactions between controllers will vary considerably This paper describes four models of job control that are equally functional but use di erent paradigms for managing jobs Although each is attempting to serve the same purpose in the same context the four ways of viewing the system lead to distinct implementations which cannot interop erate This demonstrates the importance of specifying the control model when designing an object oriented manufacturing system
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