Order scheduling 23 the order scheduling module

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Order scheduling
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23 The order scheduling module assigns the production orders to the various work centers in the plant. It follows directly from the order release module. The order scheduling module in shop floor control is intended to solve two problems in production control. 1. The machine loading problem 2. The job sequencing problem To schedule a given set of production orders or jobs in the factor, the orders must first be assigned to work centers. Allocating the orders to the work centers is referred to as machine loading. Job sequencing involves determining the order in which the jobs will be processed through a given work center. To determine this sequence, priorities are established among the jobs in the queue, and the jobs are processed in the order of their relative priorities. Some of the rules used to establish priorities for production orders in the plant include: Earthiest due date: orders with earlier due dates are given higher priorities. Shortest processing time: Orders with shorter processing times are given higher priorities. Least slack time: Orders with the least slack in their schedule are given higher priorities. Control ratio: Orders with the lowest critical ratio are given higher priorities. Critical ratio is defined as the ratio of the time remaining until due date divided by the process time remaining. Order progress The order progress module in a shop floor control system monitors the status of the various orders in the plant, work-in-process; and other characteristics that indicate the progress and performance of production. The function of the order progress module is to provide information that is useful in managing the factory based on data collected from the factory. The information that is presented to production management is often summarized in the form of reports. The reports include: Work order status reports: These reports indicate the status of the production orders. Progress reports: A progress report is used to report performance of the shop during a certain time period. Execution reports: An exception report indicates the deviations from the production schedule. And similar exception information. These reports are useful to production management in making decisions about allocation of resources, authorization of overtime hours, and other capacity issues.
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24 Three phases in a shop floor control system. 13. Discuss (1) Bar Code Technology (20 marks) (2) Bar Code Readers (3) Bar Code Printers Bar Code Technology Bar code technology has become the most popular method of automatic identification in retail sales and in factory data collection. The bar code itself consists of a sequence of think and narrow colored bars separated by thick and narrow spaces separating the bars. The pattern of bar and spaces is coded by scanning and decoding the sequence of bars. The reader consists of the scanner and decoder. The scanner emits a beam of light that is swept past the bar code and senses light reflections to distinguish between the bar and spaces. The light reflections are sensed by a photo
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