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responsibleforthedevelopmentofcompanymanagement,includingthedevelopmentofsettlementandsettlementstandardsofpreparation,thebusinessunitclearingworkinspectionandguidance,businesssettlementaudit;23,isinchargeofthecompanybusinessandcostscalculationandanalysisofnewprojectsandtodevelopstandardsandprovidethebasisfordecision-makingandresponsibleforthecomprehensiveeconomicandtechnicalindicatorsandstatistics,analysis,summaryandreporting;24,thecompanyresponsibleforauditsofvarioustypesofbusinesscontracts,theprincipalofcontractprice(purchaseprice,freight,taxes,etc),paymentmethod,payment,settlement,suchasthereasonablenessofthedata,authenticity,accuracy;25,strictenforcementofnationaltaxpolicy,isresponsibleforthemonthlyreporting,includingtaxcalculations,statistics,gothroughtherelevantformalities,receiveinvoices;26,thecompanyresponsibleforallkindsofprice(includingproductprice,materialprices,Freight,engineeringmachineryjobsprice,price,price)'stermsofmarketsurveys,quotations,priceexceptionreport;27,isresponsibleforthecompany'smanagement,includingconferenceorganizedbyprice,ofhistoricalprices,totals,etc;28,accordingtotheannualoperatingplan,annualcostsandundergodecomposition,control,analysisandevaluation;responsibleforcostingandcostcontrol,ensureaccountingnumberisreasonable,correct,andcompleteaccountingreportandthecompany'sotherreportscompiledandreportedtowork;不忘初心，就是始终坚持为人民服务的爱心。党的根基在人民、党的力量在人民，为此，就需要坚持一切为了人民、一切依靠人民。这让我想到了被赞为“农民的代言人”、“最敢为农民说话的代表”毛丰美同志、被誉为“太行新愚公”的李保国同志目录摘要........................................................................................1Abstract.......................................................................................21前言......................................................................................32电梯概述.................................................错误!未定义书签。2.1电梯的起源与发展...........................................................错误!未定义书签。2.2国外电梯的情况...............................................................错误!未定义书签。2.3国内电梯的情况...............................................................错误!未定义书签。2.6电梯技术发展趋势..........................................................错误!未定义书签。第3章PLC的发展.................................错误!未定义书签。3.1PLC的定义......................................................................错误!未定义书签。3.2PLC的发展阶段..............................................................错误!未定义书签。3.3PLC发展趋势..................................................................错误!未定义书签。3.4PLC的基本组成..............................................................错误!未定义书签。第4章电梯模型PLC控制系统设计....错误!未定义书签。4.1电梯的类型.......................................................................错误!未定义书签。4.2电梯示意图.......................................................................错误!未定义书签。4.3电梯的控制要求...............................................................错误!未定义书签。4.4PLC控制系统的设计分析..............................................错误!未定义书签。4.5电梯模型PLC控制系统设计.........................................错误!未定义书签。4.6PLC的选择......................................................................错误!未定义书签。4.10系统的调试与操作.........................................................错误!未定义书签。结束语......................................................错误!未定义书签。致谢.........................................................错误!未定义书签。参考文献......................................................错误!未定义书签。responsibleforthedevelopmentofcompanymanagement,includingthedevelopmentofsettlementandsettlementstandardsofpreparation,thebusinessunitclearingworkinspectionandguidance,businesssettlementaudit;23,isinchargeofthecompanybusinessandcostscalculationandanalysisofnewprojectsandtodevelopstandardsandprovidethebasisfordecision-makingandresponsibleforthecomprehensiveeconomicandtechnicalindicatorsandstatistics,analysis,summaryandreporting;24,thecompanyresponsibleforauditsofvarioustypesofbusinesscontracts,theprincipalofcontractprice(purchaseprice,freight,taxes,etc),paymentmethod,payment,settlement,suchasthereasonablenessofthedata,authenticity,accuracy;25,strictenforcementofnationaltaxpolicy,isresponsibleforthemonthlyreporting,includingtaxcalculations,statistics,gothroughtherelevantformalities,receiveinvoices;26,thecompanyresponsibleforallkindsofprice(includingproductprice,materialprices,Freight,engineeringmachineryjobsprice,price,price)'stermsofmarketsurveys,quotations,priceexceptionreport;27,isresponsibleforthecompany'smanagement,includingconferenceorganizedbyprice,ofhistoricalprices,totals,etc;28,accordingtotheannualoperatingplan,annualcostsandundergodecomposition,control,analysisandevaluation;responsibleforcostingandcostcontrol,ensureaccountingnumberisreasonable,correct,andcompleteaccountingreportandthecompany'sotherreportscompiledandreportedtowork;不忘初心，就是始终坚持为人民服务的爱心。党的根基在人民、党的力量在人民，为此，就需要坚持一切为了人民、一切依靠人民。这让我想到了被赞为“农民的代言人”、“最敢为农民说话的代表”毛丰美同志、被誉为“太行新愚公”的李保国同志1摘要随着我国经济的高速发展，微电子技术、计算机技术和自动控制技术也得到了迅速发展，交流变频调速技术已经进入一个崭新的时代，其应用越来越广。而电梯作为现代高层建筑的垂直交通工具，与人们的生活紧密相关，随着人们对其要求的提高，电梯得到了快速发展，其拖动技术已经发展到了调频调压调速，其逻辑控制也由PLC代替原来的继电器控制。电梯的电气系统由拖动系统和控制系统两部分组成。目前电梯设计使用可编程控制器(PLC)，功能变化灵活，编程简单，故