Modbus通讯协议在S7—200通讯中的应用

S7—200型可编程控制器适用于工业现场的过程控制。Modbus通讯协议已经为众多自动化设备所广泛采用。采用了Modbus通讯协议的S7—200可编程控制器,可以方便地连接工业现场控制设备。介绍了基于Modbus协议的S7-200通讯程序设计。     

自动化热喷涂机控制系统

采用德国西门子公司生产的S7－200可编程控制器作为自动化热喷涂机控制系统的核心部件。给出了其电气结构硬件框囹及控制系统程序框圄。介绍了控制程序的设计及利用S7－200CPU214PLC本机带有的高速计数器（开关量输入口）实现移动速度、转动速度的测量与软件设计。     

S7-200PLC模拟量采集的经济实现

针对西门子S7-200系列PLC模拟量采集成本昂贵的现状,设计了一种适用于S7-200 PLC的廉价解决方案。硬件方面,介绍了模拟量采集模块的构成及与S7-200的连接方法;软件方面,介绍了通信数据包格式、通信协议、数据采集模块的数据上传程序以及S7-200的接口程序。本方案与S7200原厂模拟量采集模块相比,应用成本大幅度降低。     

基于FameView的车用空调控制器耐久试验台设计

本文介绍由西门子S7-200系列可编程控制器和工业PC机组成车用空调控制器耐久试验台,详细介绍了利用FameView组态的试验台的监控系统的过程,介绍了FameView与PLC通讯的原理。     

基于PROFlBUS－DP的PLC控制系统

针对PROFlBUS－DP现场总线的功能和特点,并且以PROFlBUS－DP现场总线为基础,通过组态实现了西门子S7－300作为主站与三台智能从站S7－200之间的EM277进行通信,从而可以监控三台S7－200下的设备的运行。经过实验验证,整个系统完全可以通过HMl设备端对S7－300、S7－200及其设备的运行进行监控。     

PLC在电石炉控制中的应用

介绍了以S7－200系列PLC为核心来控制电石炉温度的控制方案，并着重给出了S7－200与PC的通讯、PLC中曲线的存储、多模式切换以及变周期控制的实现方法，为矿热炉生产过程控制提供了一条有效途径。     

基于S7-200 PLC 的条码监控系统

结合基于S7－200PLC条码监控系统项目的开发，介绍了S7－200PLC的通信原理与实现，给出了系统硬件和软件的设计方案。该系统已经应用于实践，实现对条码的运行状态进行实时监控。结果表明该通信系统实用性强，使用方便。     

S7-200 PLC在电动架车机同步控制系统中的应用

本文介绍了自行研制开发的以S7－200为核心的电动架车机同步控制系统，阐述了PLC控制的原理，软硬件设计和同步控制系统控制方案。     

无线通讯在水处理监控系统中的应用

简要介绍了采用无线以太网通信技术和先进的工业监控技术的热轧水处理系统的设计和应用。该系统通过利用西门子S7—200和S7—300PLC组成的混合系统实现了现场水处理设备的自动控制和远程监控,达到了系统设计的预期目标。     

风压平衡器自动控制系统的设计与实现

本文介绍了西门子S7-200可编程序控制器在风压平衡器自动控制系统中的设计与实现。结合卷烟生产工艺，分析了在卷烟生产过程中应用风压平衡器的必要性。根据S7-200可编程序控制器的特点．详细介绍其在控制风压中运用的控制原理．软件及硬件的实现方法。设计完成的系统运行可靠、操作方便、具有很强的实用性。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。