基于Modbus RTU协议的FX3U PLC与变频器的通信设计

介绍以三菱FX3U-32MR PLC为主站,三菱变频器FR-A740-3.7K-CHT为从站的变频调速控制系统。重点介绍基于Modbus RTU协议通信规格编写的PLC主站通信程序,以实现PLC与变频器之间的通信控制。     

Modbus协议的工业PLC监控仪表设计

本监控仪表基于Modbus协议设计,采用STC12C5A60S2高速单片机,与西门子工业PLC通信实现PLC控制与过程数据的实时在线读写显示与报警,并为工业DCS系统提供远程4～20mA工业标准电流信号输出。工作时仪表为Modbus主站,PLC为Modbus从站。采用Modbus协议,还可使本仪表用于其他支持Modbus协议的各种工业控制设备的监控。本文介绍了仪表的主要电路设计,剖析了Modbus协议细节,并给出了仪表Modbus软件的实现思路及程序代码。     

基于Modbus协议的S7-200 PLC与矿用智能遥控接收机的通信

介绍了Modbus协议的特点,分析了S7-200 PLC Modbus RTU主站协议库,确定了采掘设备控制器S7-200 PLC与矿用智能遥控接收机的数据通信采用Modbus RTU协议,实现了采掘设备与遥控装置的双向通信。应用结果表明,以S7-200 PLC为主站的Modbus通信,传输数据准确可靠,效果良好。     

基于Modbus的西门子SMART PLC与信捷XC系列PLC通信

基于Modbus通信,以西门子SMART PLC为主站,信捷PLC为从站,主站读取、写入从站信息,实现工业互联.主要介绍了Modbus通信原理、硬件接线方法、软件梯形图程序,以及调试结果.     

支持双网双主站的Modbus通信在继电保护中的应用

根据Modbus通信协议的特点以及继电保护装置中对通信可靠性的要求,提出了支持双通信网络、双主站的Modbus通信在继电保护装置中的应用。简介TModbus通信协议,系统冗余和单元冗余的概念。给出了双网双主站的通信方案,说明了为支持冗余在主站和子站设计上应该注意的问题,定量分析了采用单元冗余、系统冗余混合冗余的方式为系统可靠性提高带来的影响。说明了Modbus协议传输继电保护装置信息的数据交换过程和应当注意的问题,如镜像数据区定义,TCP粘连包的问题等。     

基于Modbus协议的施耐德M340与西门子S7-200 PLC的通讯方法

Modbus协议作为一种简单实用的协议,在工业控制系统得到广泛应用。本文以上海海事大学—施耐德电气联合实验室的船舶电气设备为基础,详细介绍了一种基于Modbus协议的施耐德M340作为主站与西门子S7-200 PLC作为从站的通讯方法,实现了施耐德M340主站与西门子S7-200 PLC从站的数据交换,解决了船舶配电屏对模拟电阻箱的远程控制功能。     

Modbus协议的RS485总线通讯机的设计及应用

该文详细论述了基于Modbus协议的RS485总线通讯机设计原理及应用.物理结构上包括上位机、主站、和多个从站节点.在上位机与各从站节点间增加主站,承担上位机的轮询工作,使上位机从繁忙的通信工作中解放出来,并能够提高系统独立性,加快系统从故障中恢复的速度.软件方面基于Modbus协议,并且添加CRC校验,从而有效地提高了系统的可靠性、安全性.本设计已成功应用于某监狱门禁控制系统.     

基于Modbus协议的台达人机界面异构通讯

本文讨论了Modbus协议环境下台达DOP系列人机界面的异构系统集成技术。以台达DOP系列人机界面分别作为主站和从站的两种不同架构案例，给出台达DOP系列人机界面与其它品牌控制器的基于Modbus协议实现通讯的方法。     

基于Modbus RTU协议的西门子PLC与智能仪表通信

通过对Modbus RTU工业网络协议的研究,并基于西门子S7-1500系统通过CM1541进行Modbus RTU通信,PLC作为主站轮询多个从站,实现了对2台FP23智能仪表的监测和控制。同时还介绍FP23智能仪表作为从站的系统设置和仪表命令。     

基于S7-200 PLC的Modbus主从站编程与应用

从工程需求出发,提出了利用S7-200 PLC集成免费的Modbus RTU主站和从站通信库,以一个典型实例编程实现S7-200PLC作为工业自动化领域含Modbus通信协议的网络中间设备,具有很好的实用价值。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。