PLC与变频器在四层电梯教学模型中的应用

PLC与变频器在电梯控制系统中的应用非常广泛。本文介绍了四层教学电梯模型中PLC与变频器控制的设计思想,提出了适用于高层电梯控制程序设计的编程方法。     

基于PLC的四层电梯控制

电梯是生产和生活中常见的运输工具.随着科技的发展,电梯已采用PLC进行控制.应用触发器指令设计的基于PLC的四层电梯控制系统的控制方案思路清晰、简单、方便,易于扩展至多层电梯控制.     

基于西门子PLC和变频器的桥式起重机电气控制系统设计

针对通用桥式起重机的使用功能和控制要求,设计了系统硬件和软件。采用西门子S7-300PLC和S7-200PLC构成工控网络作为整个通用桥式起重机的电气控制系统核心,通过触摸屏组态设计对电气控制系统实施控制和监测,PLC接收触摸屏指令去控制变频器驱动电机进行调速。整个控制过程的PLC程序流程包含主钩运行程序、副钩运行程序、大车运行程序和小车运行程序四个部分,最终构成完整的桥式起重机控制系统。     

三层电梯PLC控制与组态模拟设计

介绍了使用三菱FX2N可编程控制器编写的1个3层电梯的控制系统。利用亚控组态软件组态王6.0制作人机对话界面,检验电梯PLC控制系统的运行情况。实践证明,可编程控制器(PLC)和亚控组态软件结合有利于PLC控制系统的设计、检测。     

三层电梯PLC控制系统的设计

本文阐述了可编程控制器在三层电梯控制系统中的应用,主要从电梯的控制要求、PLC选择、I/O分配、梯形图的设计与调试等方面进行了软件和硬件上的设计,并实现了一种三层电梯的控制系统的设计。     

变频器在工业洗衣机控制系统中的应用

为了加强三菱PLC和艾默生变频器在工业洗衣机调速系统中的应用,设计了PLC控制系统硬件电路及控制程序,通过变频器内置PLC功能实现洗衣机的洗涤时间及洗涤频率的控制,给出变频器具体的参数设置。实践运行表明,该控制系统设计合理、运行可靠、提高了工业洗衣机的自动化水平,减少了机械传动机构,节省了能源。     

电梯PLC控制系统的组态模拟设计

应用三菱FX0N可编程控制器编写的一个三层电梯的控制系统,利用MCGS组态软件制作人机对话界面,检验电梯PLC控制系统的运行情况。实践证明,PLC可编程控制器和MCGS组态软件结合有利于PLC控制系统的设计、检测,具有良好的应用价值。     

FP系列PLC电梯控制系统平衡系数特性分析

分析了电梯的工作原理和电梯的平衡系数的测定,结合变频器和PLC的性能,讨论了电梯控制系统的工作特性.     

艾默生推出安全、平稳、高效的TD3100系列电梯控制专用变频器

多年来,一直专注于变频器、PLC、UPS等网络能源领域产品研发与创新的艾默生网络能源有限公司在原有产品TD3000系列高性能矢量控制变频器的基础上,综合多种国内外电梯专用变频器的特点,推出了艾默生TD3100系列电梯控制专用变频器。艾默生TD3100系列变频器采用DSP+MCU结构和先进模块化设计,适用功率等级在7.5￣30KW范围,最高速可达4.000M/S,最大楼层可达50层。其卓越的性能,专业的设计均达到了国际领先水平。在TD3100系列变频器的设计中采用了优化的控制模式,具有运行效率高、平层精度好、调试方便的特点;其内置接触器抱闸控制,停电…     

基于组态王的电梯监控系统实现新方案

对FX-2N-48MR PLC及编程软件SWOPC-FXGP/WIN-C的简述、组态王V6.5软件简介、电梯控制系统介绍.以FX-2N PLC控制的电梯系统为例,介绍基于组态王的电梯监控系统实现新方案,并在计算机仿真软件系统运行,结果表明,系统运行正常,动画效果良好.     

Western and Eastern culture differences in commercial field

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.     

风的曲线

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.     

团图为数的图中的闭团贯数

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.     

汉字倒说

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。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Social and Cultural Influence on Word Meaning

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.     

钱生钱!

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     

只要努力,不要后悔

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.     

Inequalities for inscribed simplexes

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.