通过S7-200PLC自由通讯口与变送器的通讯

通过S7-200PLC的自由口实现与仪表的通讯,从而实现数据的交换,进而实现在称重仪表系统中的控制要求,增强仪表的应用.     

什么是CATS

CATS(COMPUTER ASISTED TRAINING SYSTEM)计算机辅助训练系统是加拿大CAE公司研制生产的一种计算机辅助教学设备。它采用FFS或FTD的实施飞行软件,可以在教室里十分形象准确再现飞行过程中各仪表的工作情况和飞机各系统在工作过程中的原理示意图。它对于飞行和维护人员准确深入的学习和掌握飞机各系统的工作原理和仪表显示,     

基于串口通信的配料称重系统的设计与应用

笔者针对目前化工等行业中的配料称重工序的自动化程序较低,人工操作发生无意误差可能性过大的状况,设计了一套基于串口通信的自动化配料称重系统。该系统实现了化工等行业中的配料称重工序的改进,实用性强,大大提高了生产效率和生产管理水平。     

基于串口通信的配料称重系统的设计与应用

笔者针对目前化工等行业中的配料称重工序的自动化程序较低,人工操作发生无意误差可能性过大的状况,设计了一套基于串口通信的自动化配料称重系统.该系统实现了化工等行业中的配料称重工序的改进,实用性强,大大提高了生产效率和生产管理水平.     

无线动态汽车称重系统设计

给出了一种无线动态汽车称重系统的设计方法,设计了以ARM为主控芯片,基于ARM的称重平台和数据处理仪表。重点介绍了信号调理模块、LCD模块和声音提示模块、无线收发器电路模块、CAN总线通信模块的设计。实验结果表明,本系统具有应用价值高、测量精度高、可靠性高、传输距离远等优点。     

国内外称重传感器的现状及其应用分析

称重传感器对企业的发展有着非常重要的意义,本文主要叙述了国内外称重传感器的发展现状,介绍了电子称重系统中各种不同的称重传感器的工作原理和技术特征。     

谈职技高师化工仪表及自动化课程的设置

一、课程教学目标化工仪表及自动化是一门将自动控制学科、仪器仪表学科及计算机学科的理论与技术服务于化学过程的综合性的技术学科，其任务是使学生掌握化工生产中的检测技术和自动控制系统方面的知识，培养学生分析和解决工程实际问题的能力。通过本课程的学习，使学生掌握化工仪表及自动化方面的基本理论，内容包括自动控制的基本概念，被控对象的数学模型，化工生产中主要工艺参数的测量原理、显示仪表、基本控制规律和控制器及执行器、典型化工单元的控制方案六个部分。二、教学基本要求与教学内容体系设计应用化学专业化工仪表及自动…     

松下FPO型PLC与称重仪表串口通信的实现

以自动打包秤控制系统为例,介绍如何使用松下FP0型PLC的串行通信口和智能称重仪表连接,实现对仪表数据的读取。     

本钢皮带秤称量计算机管理系统的设计与实现

介绍了利用MSComm控件实现与XR2000皮带秤称重仪表串口通信,完成实时数据采集、跟踪。重点论述了系统的需求,VB串口通信方法选择、数据库设计及关键技术的实现。该系统能满足本钢皮带秤计量管理需求,实际运行结果表明：该系统在各个主控室、配料室、调度室的实时数据采集、处理、统计、查询过程中及时准确、运行稳定可靠。     

基于单片机的在线称重分选检测系统设计

针对定量包装产品出厂前的重量检验需求,设计基于单片机的在线称重分选检测系统.先阐述系统的基本构成和原理,再重点对检测控制系统进行设计.测试情况表明该系统具有称重检测精度高、分选速度快和误检率低的特点,有良好的应用前景.     

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,     

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.     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

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.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

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.