plc作为前端处理机在工厂信息系统中的应用

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1、青岛大学毕业论文（设计）科技文献翻译院系:自动化工程学院控制工程系专业:自动化班级:2005级1班姓名:赵延刻指导教师:赵岩岭2009年4月26曰APPLICATIONOFPLCSASFRONT-ENDPRE-PROCESSORSINFACTORYINFORMATIONSYSTEMSD.W.RussellDepartmentofElectricalandComputerEngineering,PennStateUniversity,USAFactoryinformationsystems(FISs)havegrowninacceptancelargelybe

2、causeofthesuccessfulintegrationofavarietyofdata-collection,entryanddisplaydevices.Thetraditionalfactorycomputersystembyandlargeignoredthemoment-by-momentconsequencesofproductionprocesses，andfocusedinsteadontheassistanceofferedbyautomatedshift-endcountingandschedulingprocedures.Sepa

3、ratesystemshandledthevariousfunctions(e.g.orders,rawmaterials,inventory，scheduling,etc.)andtheassessmentofproductivitywaslefttothefindingsofendlessmeetings,negotiationsandtheinterpretationofageddatareports.Thedataunderconsideration,howevercarefullycollected,wassomuchaftertheeventth

4、atproblemsforcedthefactoryintoacrisis-managementmodeinthehopethatsomerestitutioncouldbemade.Real-timedataisnormallyavailableintheprocessitselfbutisdifficulttocondenseintoaformthatisusefulforschedulingandFISfunctions.Suchdatacontainsvitalinformationastotheactualreal-timemachineperfo

5、rmanceontheshopfloor，andifprocessedcorrectlycanbeusedtoindicateandforecastproductionproblemssothatcalm，yettimely，adjustmentstoschedules，etc.canbemade.ThispaperdescribeshowaPLC(programmablelogiccontroller)wasusedtocollect,pre-processandpasssummaryresultstoalow-costsupermicrocomputer

6、forproductionmonitoringandFISpurposes.Thisworkwasundertakeninresponsetoanindustryneedforlow-costsystemsthatcouldberetrofittedtofactorieswithminimaldisturbancetotheirday-to-dayoperations.Keywords:FIS;PLC;Front-endprocessing；Productionmonitoring1.IntroductionInthefactory,’’data”isano

7、rder,anordernumber，amachinesetting，afluidpressureandahostofotherlooselyconnectedfactors.Eachoneisdefinedinanidealsense,butintherealityoftheenvironmentisoftensuspect.Wirthcommentsontheabstractionofrealitycontainedin’’data”insidethecomputer，sohowmuchmoreisthistrueinthehostilefactorye

8、nvironment!Thecausesforthe