共查询到20条相似文献，搜索用时 78 毫秒
1.
张杰 《通化师范学院学报》2010,31(8):46-47,51
该文介绍了以Wonderware公司intouch软件与S7-400PLC为主构建工业以太网络,组成分布式网络系统在啤酒发酵控制过程中实现网络化控制及远程监控的控制过程,建立包含Ethernet、PROFIBUS-DP总线、AS-interface总线的工业三层结构网络系统. 相似文献
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苏筱丽 《兰州石化职业技术学院学报》2008,8(2):34-35
苯乙烯装置控制系统采用组态软件WINCC实现监控的方法解决了西门子S7—400系列PLC与监控计算机的通信问题增强了人机对话的能力,使实时监控系统工作情况和系统操作变得明了方便。 相似文献
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采用PROFIBUS—DP现场总线控制系统,选用西门子公司的S7—300PLC作为主控站、S7—200作从站,同时采用PC机作为主站,并配备了SIMATIC STEP7编程软件和WinCC监控软件,构造设计机电一体化柔性教学实训系统。 相似文献
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汪岚 《通化师范学院学报》2013,34(6):36-37,114
从系统设计需求出发,提出以S7-200的PLC为下位机,以MCGS为上位机的监控软件实现车库自动门监控系统的设计.该系统应用计算机构建动态监控画面,模拟车辆和自动门的运行,工作人员通过监控画面不仅能实现自动门的实时监视和数据采集,还可通过上位机直接控制门的运行状态.运行结果表明,系统可靠且具有人机界面友好、控制简单方便等优点,很好的提高了系统的监控力度. 相似文献
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以德国FESTO公司的MPS模块化生产加工系统为基础,设计了一种基于Kingview组态王的自动化生产线实时在线监控系统.系统采用西门子S7-300系列PLC作为主要控制设备,完成自动控制系统的硬件和软件设计,实现PLC与上位机之间的通信,并利用工业组态软件KingView完成监控程序的开发,实现对该系统的实时在线监控. 相似文献
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根据RO-混床超纯水制备的最新工艺,讨论了其控制系统的集成方案和构架,采用分布式I/O和S7-400H集中监控的方式进行了控制系统设计,在此基础上选择了基于S7-400H的硬件冗余方式进行系统的冗余设计;采用设备层、控制层、及基于西门子组态软件WinCC的监控管理层的典型的三层网络控制系统,且通过OPC方式将超纯水控制系统组态到整个工厂的控制系统中,成为整个工厂控制系统的一个子系统,方便企业级管理。并给出了控制系统的硬件设计、软件编程以及基于Intouch组态软件的上位监控系统。经过4年的实际运行,该超纯水自动化系统工作稳定可靠,完全满足要求。 相似文献
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苏筱丽 《兰州石化职业技术学院学报》2006,6(2):11-13
兰州石化公司合成橡胶厂苯乙烯车间乙苯装置技术改造使用西门子S7-400、S7-300系列PLC实现双CPU冗余控制,并用上位机WINCC组态实现人机对话,完成复杂联锁的可靠控制,满足工艺控制需要. 相似文献
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《实验室研究与探索》2017,(5)
有效控制温室温湿度环境是温室业研究的重要课题之一,以西门子S7-200系列小型PLC作为控制器,组建温室自动监控系统,可实时采集控制温室的温湿度,并利用串行口通信实现与上位PC机的信息交互,用户可通过上位机监控软件监测温湿度信息,并可选择手动或自动两种控制模式实现温湿度调节控制。通过试验,该系统实现了温室温湿度信息的采集、显示与预警,并能够可靠实现温湿度控制;上位机监控软件界面友好,操作方便,能够保存采集的温湿度信息,方便用户进行数据分析。该设计对于温室环境自动监控以及PLC实践教学具有一定实际意义和应用价值。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献