基于PLC的自动化包装生产线集成控制系统设计

为提升传统包装生产线集成控制系统的控制性能,本文设计了基于PLC的自动化包装生产线集成控制系统.选择PLC控制器、称重传感器、光电传感器、变频器等集成控制系统元器件,并调整各个元器件之间的连接电路.在此基础上,分析自动化包装生产线工艺流程,结合生产线中的机械结构确定包装生产线机械控制对象,编写PLC控制程序,并从链条速...     

基于组态软件的模块化生产线控制系统

为了提高模块生产线的装配速度,针对模块的特点,提出了研发以物料传输自动化为主的柔性生产线来适应模块装配需要。该生产线控制系统主要由工控机与西门子公司的PLC200系列组成。通过组态软件监控界面连接PLC来监控各个工位和运动小车的状态。使用组态软件进行监控画面的编制,实现装配线的实时监控、数据采集与处理。系统结构简单,实用性好,应用性强。     

基于简单CPU通信的自动化生产线通信的实现

自动化生产线由不同加工工艺的单站设备组成,各单站设备通常由PLC控制,按照工艺要求完成对产品的加工。各单站之间通过网络通信连接,共同构成生产线的硬件架构。讨论了基于简单CPU通信协议的自动化生产线通信的实现方法,以典型自动化生产线设备中“1主站PLC+4从站PLC”控制系统的通信为例,重点论述了通信的技术要求、硬件组网、软件设置、通信测试,详细介绍了组网通信的实现过程。     

系统仿真及OPC技术在系统调试中的应用

在自动化系统制造或改造过程中,为了能够实现对控制系统软件的充分离线调试,从而能够在软件上线运行前尽可能多地排除控制系统软件中的缺陷,采用系统仿真和过程控制中的对象连接与嵌入(OPC)技术是一个好的选择。通过系统仿真技术,在软PLC中开发必要的控制对象仿真模型,并通过OPC实现与控制系统之间的连接,从而使得控制系统软件能够在虚拟的自动化生产线上进行在线调试和运行,以排除软件缺陷,测试软件性能。     

机械手的PLC控制系统设计

随着自动化生产程度的提高,PLC在生产控制系统中的应用也越来越广泛,介绍了自动化生产线上机械手实现搬运的工作,机械手硬件设备的选型和接线等,并介绍了利用步进电机实现对其控制的控制程序的编写要点。     

嵌入式控制系统在汽车自动化生产线的研究与应用

随着汽车自动化生产线的大型化、复杂化和智能化发展,传统模式下通过PLC等控制设备进行生产线的集中式控制几乎难以胜任大型复杂的控制体系,集中式控制逐步向分布式控制体系发展。嵌入式控制系统是支撑分布式控制体系的重要组成部分,本文以底板线为案例探究嵌入式控制系统在汽车自动化生产线分布式体系中的应用,为汽车制造行业的控制体系提供一种满足控制实时性、运行高效性、部署模块化和可产业化应用的嵌入式控制系统软硬件解决方案。     

基于工业以太网+现场总线的通讯网络设计

介绍了自动化网络结构和工业以太网的优势。针对某腈纶纺丝生产线传统的控制网络通讯系统,提出基于IndustrialEthernet＋Profibus—DP通信的PLC控制系统的设计。阐述了主从PLC、PLC和变频器的通信过程和网络设置以及该控制系统的软件实现。设计后系统抗干扰能力强、通讯速度快、易于扩展。     

基于PLC的电镀生产线自动行车控制系统设计

为了进一步提高现代工业中物料运输的工作效率,本文以电镀生产线的自动行车控制系统作为主要研究对象,通过引入PLC控制模式,进而从硬件和软件两方面对基于PLC的电镀生产线自动行车控制系统展开了全面的设计和研究。     

4米钢板预处理线控制系统设计

针对4米钢板预处理线的生产流程,设计了一种基于PLC和触摸屏的控制系统,实现对生产线的过程控制和远程监控;该设备现场运行表明：自动化程度高,控制方式灵活,人机对话界面友好,功能全面,运行可靠。     

鞍钢冷轧厂电解清洗线综合自动化控制系统

为了提高生产线的自动化控制水平，根据冷轧厂电解清洗线的工艺要求及控制特点，将西门子最新产品和技术应用在冷轧板处理线自动化控制系统。设计了基于西门子S7—400PLC、WINCC监控软件、工业以太网、Profibus-DP现场总线和工控机的综合自动化控制系统。将西门子全集成自动化（Totally Integration Automation—TIA）的思想贯穿于系统配置设计的始终，使传动控制系统、过程控制系统、上位机系统集成到PCS7，使系统配置更简捷、可靠、有效，调试更方便，实现了清洗生产过程的优化控制、优化运行和优化管理，取得了明显的应用成效。     

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