基于MODBUS通讯协议的共锥度监控系统

介绍MODBUS通讯协议的特点,以共锥度测量系统为例,给出一种可编程逻辑控制器（PLC）与上位机以及变频器通讯的程序流程的设计方法,实现系统通讯.MODBUS通讯协议在PC机与PLC之间以及PLC与变频器之间通信的运用,实现了共锥度测量各个系统的通讯,并体现出很好的实时性和可靠性.     

基于PLC和单片机的平网印染控制系统的设计

介绍一种基于PLC和单片机网络的平网印染计算机控制系统,给出了系统的硬件组成、软件设计及上位机、下位机之间的通讯方式.     

用VB6.0实现西门子PLC与PC机的串行通讯

对西门子系列PLC的通讯协议进行了详细的介绍,并以VB6.0开发系统在WINDOWS环境下实现了PC机与西门子系列PLC之间的串行通讯.文章给出了PLC和VB6.0相关的主要程序,通过该通讯程序实现了PC机对西门子系列PLC的监控和控制.同时本程序对PC机与其他型号PLC之间的通讯也有一定的借鉴意义.     

PLC与上位机监控系统的串行通讯实现

PLC与上位机监控系统的通讯技术是工业控制系统中的关键技术之一。以超薄快速铸轧板形控制系统为基础 ,在保证系统通讯安全可靠的前提下 ,设计了PLC与上位机监控系统最经济、可靠的通讯方案 ,采用功能强大的开发工具C Builder编制上位机通讯程序。该方案实现简单 ,通讯可靠 ,可移植性强 ,适合于同类的工业控制系统     

基于MODBUS通讯协议的共锥度监控系统

介绍MODBUS通讯协议的特点,以共锥度测量系统为例,给出一种可编程逻辑控制器(PLC)与上位机以及变频器通讯的程序流程的设计方法,实现系统通讯。MODBUS通讯协议在PC机与PLC之间以及PLC与变频器之间通信的运用,实现了共锥度测量各个系统的通讯,并体现出很好的实时性和可靠性。     

基于PPI协议的S7-200 PLC与上位机的数据通讯

系统采用SIEMENSS7—200PLC,控制纸机的上浆浓度、流量等参数,达到间接控制纸页的定量和水分的目的。通过硬件和软件侦听的方法,分析PLC内部固有的PPI通讯协议,然后上位机采用VB编程,遵循PPI通讯协议,读写PLC数据,实现人机操作任务。这种通讯方法,与一般的自由口通讯协议相比,省略了PLC的通讯程序编写,只需编写上位机的通讯程序,还节省了PLC资源,缩短了系统开发周期。     

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。     

火电厂辅机程控系统设计与实现

辅机程控系统通过集中上位机、PLC、远程I/O机柜间的光缆冗余通讯,合理的PLC软件设计,形象的上位机监控界面,实现了辅机系统设备运行自动化.并可实现与SIS(厂级实时信息管理系统)系统的联网.     

多种PLC数据采集系统的实现

PLC与上位机监控系统的通讯技术是工业控制系统中的关键技术之一。在保证系统通讯安全可靠的前提下,设计了PLC与上位机监控系统最经济、可靠的通讯方案,采用功能强大的开发工具VS2017编制上位机通讯程序。该方案实现简单,通讯可靠,可移植性强,适合于同类的工业控制系统。     

基于MODBUS-ASCII通讯协议的仪表数据采集

流量计仪表的累计流量需要PLC通过通讯方式进行数据采集,通讯接口为RS485接口,通讯协议为Modbus-ASCII.本文介绍了仪表数据采集系统的结构以及所需软、硬件,并对仪表的参数设置及通讯协议也做了详细阐述.最后以实例介绍了PLC的硬件组态与主要程序设计.     

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。     

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.     

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.     

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.