Package Router Control Problem Description (cont’d).pdf

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2017-04-06 发布于江苏
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Package Router Control Problem Description (cont’d).pdf

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Package Router Control Problem Description (cont’d)

Egon Bo?rger (Pisa) Package Router Illustrating the construction of ASM ground models Universita? di Pisa, Dipartimento di Informatica, I-56127 Pisa, Italy boerger@di.unipi.it Copyright c? 2007 Egon Bo?rger, Dipartimento di Informatica, Universita? di Pisa, Pisa, Italy. 1 Package Router Control Problem Description A pkg router is a large mechanical device used by postal and delivery organisations to sort pkgs into bins according to their destinations. The packages carry bar-coded labels. They move along a conveyor to a reading station where their pkg-ids and dests are read. They then slide by gravity down pipes fitted with sensors at top and bottom. The pipes are connected by two-position switches that the computer can flip (when no pkg is present bw the incoming and outgoing pipes). At the leaves of the tree of pipes are dest bins, corresponding to the bar-coded dests. Copyright c? 2007 Egon Bo?rger, Dipartimento di Informatica, Universita? di Pisa, Pisa, Italy. 2 Package Router Control Problem Description (cont’d) A pkg cannot overtake another either in a pipe or in a switch. Also, the pipes are bent near the sensors so that the sensors are guaranteed to detect each pkg separately. However, pkgs slide at unpredicatable speeds, and may get too close together to allow a switch to be set correctly. A misrouted pkg may be routed to any bin, an appropriate mssg being displayed. There are control buttons by which an operator can command the controlling computer to stop or start the conveyor. The problem is to build the controlling computer to obey the operator’s cmds, to route pkgs to their dest bins by setting the switches appropriately, and to report misrouted pkgs. Copyright c? 2007 Egon Bo?rger, Dipartimento di Informatica, Universita? di Pisa, Pisa, Italy. 3 bin Conveyor Reading Station pkg pkgpkg binbin bin switch inSensorPackage Router Layout outSensor pipe Copyright c? 2007 Egon Bo?rger, Dipartimento di Informatica, Universita? di Pisa, Pisa, Italy. 4 Package