欧姆龙CJ1W-SCU21通信扩展模块的无协议通信应用研究

无协议通信方式是PLC的一种串行通信方式,可以应用于PLC与上位机以及发信/授信器等其他设备的通信。介绍了以欧姆龙CP1H系列PLC为控制核心,以RCV02发信/授信器为通信对象,介绍了CJ1W-SCU21通信扩展模块的无协议通信方式。对使用无协议通信方式和通信扩展模块注意的问题作了总结。     

锡焊机中PLC与单片机之间通信的设计

介绍了本公司锡焊机中S7-200系列PLC与单片机进行通信的方法,包含通信设置,程序设计等。其中硬件以PLC为主机,单片机为从机,AT89C51单片机输出信号通过RS-485总线与S7-200系列PLC进行通信,并简单介绍了通信协议。     

欧姆龙PLC无协议通信功能研究

无协议通信是PLC的一种串行通信方式,可以应用于PLC与上位计算机或其他设备的通信.简要介绍了无协议通信的原理,给出了PLC与计算机之间、两台PLC之间、PLC与RFID控制器之间进行无协议通信的方法与编程方式,对无协议通信应用中需要注意的问题作了总结.     

小型水电站数据采集系统中PLC与PC的通信方法

阐述了一种在小型水电站水力监测数据采集系统中PLC与PC串行通信的实现方法,给出了PLC与PC的硬件接口方法,阐明了实现PLC与PC之间正常交换数据的通信原理,编写了基于Windows和VB环境下的通信程序,在江西洪门水电厂计算机监控系统中运行表明通信方法简单、稳定且可靠性高.     

Linux下基于ARM的工业控制终端与PLC通信技术的研究与应用

结合自动切纸机的嵌入式工业控制终端的开发,分析了Linux下以ARM9为处理器的工业控制终端与三菱F×系列PLC通信的过程.详细介绍了ARM与PLC之间的通信协议、通信命令、通信机制,可以实现ARM与PLC之间实时数据交换和控制功能.     

PLC与微机的串行通信程序设计

介绍了松下FP0型PLC与计算机的通信方式，实现了在Windows环境下计算机与松下PLC的串行通信，并给出了用Visual C＋＋编写的基于通信控件的部分应用程序及PLC的程序流程图。     

LabVIEW与三菱PLC串口通信的实现

以电机星三角降压启动监控系统为例,介绍了通过FX2N-232BD通信扩展板,实现LabVIEW 与FX2N系列PLC串口通信的方法.设计了电机星三角降压启动的PLC控制电路,编写了三菱PLC通信扩展板的通信程序,给出了上位机LabVIEW软件的监控程序,并且创建了用于人机交互的前面板.     

S7-300系列PLC与PC串口通信技术的研究与应用

在实际工业控制系统应用环境中,研究PLC与PC机之间的串口通信技术有助于实现PLC与Windows程序开发环境间的实时通信.基于对PLC与PC机之间的串口通信的研究,系统实现了Visual C 6.0与PLC的适时通信,从而实现工业控制系统中上下位机的通信,并将这种通信方法应用于实际工业环境,将由PLC采集的数据在上位机进行实时的显示以利于复杂系统的调试.     

用C语言实现PLC和上位机的串行通讯

以可编程控制器(PLC)应用于氧化铝生产过程为例,讨论了用C语言实现PLC与上位机通讯的方法,提供了实现上、下位机通讯的基本思路。该方法可应用到其他类型的通信系统中,实现PLC与其他系统相连,进行数据交流和实现网络化控制。     

基于VB的PC与LG PLC的通信方法

根据LG MK系列PLC的特点,给出了利用Visual Basic中的通信控件实现计算机与PLC的串行通信的方法.比较了PC通过RS-232和RS-485与PLC通信的特点,最后给出了通过RS-485实现串行通信的详细设计过程.该通信控制方案简单、实用,可以大大降低工程成本.     

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     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.