基于赫优讯嵌入式模块EtherCAT从站设备的设计

随着实时工业以太网技术的发展,在最新版本的IEC61158 Ed.4标准中已经包含了Profinet,EtherCAT,Ethernet/IP,SERCOSⅢ等11种实时以太网行规集。以netX网络控制器为处理器的嵌入式模块comX,是支持所有主流实时以太网协议的嵌入式模块。本文在介绍了实时以太网和netX网络控制器的基本结构和功能的基础上,详细探讨了基于该嵌入式模块comX的实时以太网从站设备的网络接口硬件组成和软件实现,以及在智能分拣系统中的应用。     

基于赫优讯嵌入式模块EtherCAT从站设备的设哥

随着实时工业以太网技术的发展．在最新版本的IEC61158Ed．4标准中已经包含了Profinet．EtherCAT．Ethernet／IP．SERCOSⅢ等11种实时以太网行规集。以netX网络控制器为处理器的嵌入式模块comX,是支持所有主流实时以太网协议的嵌入式模块。本文在介绍了实时以太网和netX网络控制器的基本结构和功能的基础上．详细探讨了基于该嵌入式模块comX的实时以太网从站设备的网络接口硬件组成和软件实现,以及在智能分拣系统中的应用。     

研华推出2口CAN总线PCI-104通讯模块——PCM-3680I

德国赫优讯自动化系统有限公司（HiIscherGmbH）日前宣布netX开发与评估板NXEB100-NET通过CC-LinkV2．00认证。netX网络控制器具有高度的灵活性,设备制造商在基于CC-LINK协议进行产品开发的硬件设计的基础上,无需再次开发,就能够拥有具有其他现场总线和实时以太网协议接口的产品。并且,当用户设备集成netX通讯接口,     

德国赫优讯自动化系统有限公司 新一代工业网络控制芯片netX系列又有新发展

网络控制芯片netX是一个单片系统（SoC），为集成各种各样的现场总线和以太网通讯提供了无可比拟的灵活性，支持几乎所有主流的现场总线和实时以太网工业网络通讯技术。[第一段]     

论基于不同工业通讯协议的CPU数据访问方式

评估一个网络控制器的性能,通常都只会注意到它本身具备了哪些功能,在一个通讯系统中它能实现哪些特殊的功能。我们很少会注意到,当该网络控制器与高速CPU数据接口相连时,传输批量数据所遇到的数据传输瓶颈问题,特别是对于实时性能要求特别苛刻的实时工业以太网系统。与传统的现场总线系统相比,实时以太网系统的循环周期要求更小,传输的报文长度也要求更长。另外,对于同步需求和时间抖动,其精度要小于10纳秒。如果还延续过去常使用的双端口内存DPM主机接口访问方式,显然已经不能满足其性能需求了。在接下去的文章中,将讲述如何选用灵活多样的netX控制器接口来满足不同的工业通讯系统的不同需求。     

基于可编程控制器和工业以太网的电加热温控系统设计

研究了一种基于可编程控制器(programmable logic controller,PLC)和工业以太网的电加热温控系统,该系统采用先进的可编程控制器作为基本控制器实现了对大滞后、强非线性电加热系统温度的自动控制。并采用先进的工业以太网通讯方式,实现了西门子S7-200 PLC和STEP7 Micro/WIN编程软件以及S7-200和组态王监控软件之间的通讯。实验结果表明,采用可编程控制器作为主控制器对电加热温控系统进行PID控制可以达到化工实验过程中对温度控制的要求。同时,采用工业以太网进行通讯具有很好的可靠性和安全性。     

基于PROFINET的开放式以太网控制器的设计

为了适应未来工业控制领域的发展需求,设计了一种基于工业以太网--PROFINET的开放式以太网控制器,并结合可精简的TCP/IP协议栈--Lwip,实现了嵌入式Web服务器.为了完成服务器中的动态数据交互功能,提出了一种新型的嵌入式多重网关接口(EGI).通过西门子的开放式以太网协议,实现了西门子PLC与设计的开放式以太网控制器相通信,报文分析结果表明,其具有较高的可行性和有效性,为开发PROFINET IO设备提供了基础.     

离散工业设备联网监控研究

在简要分析离散工业生产的特点和网络控制需求的基础上,提出了一种基于工业以太网的联网监控方案,利用嵌入式控制器作为连接离散工业设备的节点,再组成工业以太网并通过路由器接入企业信息网,从而实现了离散工业设备的联网监控.以嵌入式芯片为核心开发了嵌入式网络控制器,并在某专用汽车制造厂实现了焊接设备的联网控制.     

基于嵌入式的工业监控网络控制器的研究

本文研究并设计了一种基于嵌入式的工业监控网络控制器.先完成了硬件器件的选型及整体框架的硬件搭建,并完成了驱动设计,随后进行了控制器的以太网访问的软件设计.重点研究了网络层的功能实现,并通过相应的检测模块.本设计具有低成本,高性能和通用性的特点.     

嵌入式瘦服务器的实现及在套色系统中的应用

在工业通信和自动化应用中日益采用以太网和TCP/IP协议作为最主要的通信接口。文中介绍以微控制器C8051F020和以太网控制器RTL8019AS来共同实现嵌入式瘦服务器的方案。在C8051F020上加载简化TCP/IP协议,实现基于TCP/IP工业以太网智能节点,该智能节点可通过局域网实现和Internet的数据交换。在微控制器中协议的加载用C51语言编程实现。同时完成智能节点的设计,并给出它在自动套色控制系统中的应用实例。嵌入式瘦服务器的设计与实现,为工业生产提供远程控制机制,也必将对分布式控制技术发展产生深远影响。     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

正~~     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate