现场总线控制系统的网络变量通信技术

现场总线控制系统中的网络变量通信技术来源 PL C网络的全局 I/ O变量通信。不同现场总线的网络变量通信有所差异 ,这将导致其适用场合不同。这里剖析了 CAN总线 ,L onworks总线及 World FIP总线的网络变量通信机制指出 :CAN具有优秀实时性却具有不确定性 ,L onworks实时性一般而且具有不确定性 ,而 World FIP既具有优良实时性又具有确定性但却是主从方式。这些差异可作为用户设计 FCS系统时的参考     

总线式钻井测量系统中的通讯软件开发

首先阐述了钻井系统的发展和CAN、HART现场总线概念,详细介绍了所开发的系统主机与CAN、HART总线的通讯软件.实验结果表明,所开发的通讯软件工作正常,功能齐全,可应用于钻井测量系统.     

现场总线技术的研究及应用

随着计算机技术、网络技术、通信技术和控制技术的发展，现场总线技术逐渐成熟并被广泛运用到工业控制系统中，在石化行业中也开始得到应用。本文介绍了现场总线的基本原理，对石化领域应用较为广泛的几种现场总线进行分析比较，介绍了现场总线在我国的应用情况。     

几种现场总线的通信介质访问控制方式

本文对LON、CAN、PROFIBUS和FF四种主要的现场总线进行介绍,尤其对通信介质访问控制方式进行了较详细的描述,将有助于用户选择适合自己的现场总线,来满足工业控制中的实时要求。     

多总线集成方法研究

不同的现场总线有不同的应用领域。现场总线的发展将呈现多种总线并存的趋势。多种总线集成在一个系统上，让不同的总线充分发挥各自的优势，可以更好地共同完成控制任务。本文讨论了多总线系统的系统级和设备级集成方法。     

A flexible acquisition cycle for incompletely defined fieldbus protocols

Real time data-acquisition from fieldbuses strongly depends on the network type and protocol used. Currently, there is an impressive number of fieldbuses, some of them are completely defined and others are incompletely defined. In those from the second category, the time variable, the main element in real-time data acquisition, does not appear explicitly. Examples include protocols such as Modbus ASCII/RTU, M-bus, ASCII character-based, and so on. This paper defines a flexible acquisition cycle based on the Master-Slave architecture that can be implemented on a Master station, called a Base Station Gateway (BSG). The BSG can add a timestamp for temporal location of data. It also presents a possible extension for the Modbus protocol, developed as simple and low cost solution based on existing hardware.     

排爆机器人的远程控制系统

根据总线通讯原理,采用嵌入式系统实现排爆机器人的远程控制系统。通过嵌入式芯片运行可自定义的编译程序,实现上位机控制台与车载移动系统的通讯协议、呼叫权限,以及数据交换,并设计了可靠的冗余通讯系统。     

The open controller

The author proposes a method of achieving open control systems which, he contends, could replace the PLC. It uses IEEE1451 as a truly network-independent standard for transducers and associated networks implemented on volume hardware. A combination of chip vendors and board vendors supplies a variety of markets. JDC/IDC is used for the strategy engines running on chips and boards based on Web technology. Microsoft standards are used for a development environment and for supervisory functions. Operator screens based on Web browser technology are used. The underlying theme should be objects. As for the actual hardware to implement these standards, the fieldbuses at present define hardware: however, people are starting to mix and match. The new RISC machines, found, for instance, in the handheld devices, provide excellent cost-effective vehicles, and mezzanine standards are emerging. Associated flatscreen technology is providing good cost-effective methods for operator displays     

Developing a CASE tool for distributed control applications

The function block (FB) concept has been adopted by recent International Electrotechnical Commission (IEC) standards to define a methodology for the development of modular, re-usable, open, and vendor-independent distributed control applications. Control engineers are already familiar with the FB construct, and field devices and fieldbuses are expected to be compliant with this approach in the near future. New generation FB-oriented CASE tools are required to support the whole development process. This paper presents an approach to the design and development of an IEC-compliant CASE tool (ICT). The proposed approach is based on a four-layer architecture that successfully unifies the FB concept with the Unified Modelling Language. During the development of our prototype ICT, this architecture proved to be very significant for the identification of the key abstractions that the ICT must provide as building blocks of its various diagrams used during the modelling process of control systems.     

基于Ethernet的全开放工业控制网络

本文从信息发展的进程出发,总结了现场总线在发展中存在的问题,阐述了以太网进军工业自动化领域的必然性,说明了以太网将最终连接大多数的传感器和执行器,并由此形成一种基于以太网的全开放的扁平化工业控制网络结构。     

PROFINET的组成及其应用

文中详细阐述了PROFINET的主要组成部分:分散式现场设备及分布式自动化,以及客户所需的统一通信和现场总线集成等.PROFINET可以实现与其他现场总线的无缝集成,从而保护了商家的已有投资.PROFINET的应用,增强了生产过程的透明度,优化了系统运作.     

变频调速驱动系统中常用现场总线综述

介绍了变频调速系统现场总线控制的一般规律,对变频调速系统中经常获得支持的一些现场总线的各种性能参数、总线结构做了大概介绍,对一些常用变频器和伺服系统按照支持的总线做了分类,最后给出了两个变频调速系统现场总线控制的实例.     

智能网络传感器在钻井监控中的应用

为解决传感器与多种总线的相连问题,设计了基于IEEE 1451．2标准的智能网络传感器．该传感器包括智能变送器接口模块、网络应用处理器与变送器标准接口三个部分,智能网络传感器解决了与多种总线相连问题,能实现传感器即插即用,便于系统以后更新与升级．     

工业场所通信网络的安装标准

为了使在苛刻工业场所中的通信网络能有效的工作,必须正确安装通信网络。合适的网络安装可以减轻由于严酷环境条件、电磁干扰、安全攻击等所引起的问题,从而减少网络故障的发生以及随之发生的生产损失。IEC61918第1版作为工业场所中通信网络的正确和完整的安装导则,已于2007年12月由IEC发布。IEC61918第2版中制定了一整套能同时覆盖工业场所现场总线布线和一般布线(电信设施)的安装规则,统一与线缆安装相关的术语和定义,明确线缆安装生命周期中每一个阶段的责任和要求,为广大技术人员提供安装技术的指导。     

IEEE 1394与现场总线

随着工业现场通信量的增加，现有的现场总线很难满足要求，为解决PC领域多媒体通信问题而发明的IEEE1394（又称为火线）具有即插即用，速度高，成本低廉，易于使用等良好性能，有可能成为工业现场的新型总线标准，该文从协议框架的角度探讨了探讨了火线用作现场总线的可行性，并阐述了火线作为现场总线的不足之处。     

基于功能需求分析的单一标准多功能现场总线探讨

制定单一标准多功能现场总线标准应以功能需求分析为基础，先分析生产现场对通信功能的需求，再分析流行的各种现场总线所线所能提供的功能，最后选出尽可能少的几种现场总线，使它们的功能总和满足现场功能需求，把这几种现场总线连入开放型现场总线控制系统平台，组成单一标准多功能现场总线，这种现场总线标准中包含的几种现场总线地位平等，具有再扩展能力，可以与管理网集成，进而联入国际互联网。     

电控节能技术在挖掘机中的应用与发展

挖掘机的电控节能技术是实现功率匹配的重要技术,也是挖掘机电控系统的核心技术.简单回顾了国外挖掘机电控节能控制系统的特点,分析了国产挖掘机电控系统的发展和与国外挖掘机存在的差距,指出了挖掘机的电控节能系统将融合多种新技术,朝着智能化电液控制和节能控制方向发展.     

Motion control of multi-actuator hydraulic systems for mobile machineries: Recent advancements and future trends

This paper presents a survey of recent advancements and upcoming trends in motion control technologies employed in designing multi-actuator hydraulic systems for mobile machineries. Hydraulic systems have been extensively used in mobile machineries due to their superior power density and robustness. However, motion control technologies of multi-actuator hydraulic systems have faced increasing challenges due to stringent emission regulations. In this study, an overview of the evolution of existing throttling control technologies is presented, including open-center and load sensing controls. Recent advancements in energy-saving hydraulic technologies, such as individual metering, displacement, and hybrid controls, are briefly summarized. The impact of energy-saving hydraulic technologies on dynamic performance and control solutions are also discussed. Then, the advanced operation methods of multi-actuator mobile machineries are reviewed, including coordinated and haptic controls. Finally, challenges and opportunities of advanced motion control technologies are presented by providing an overall consideration of energy efficiency, controllability, cost, reliability, and other aspects.     

Smart manufacturing systems for Industry 4.0: Conceptual framework,scenarios, and future perspectives

Information and communication technology is undergoing rapid development, and many disruptive technologies, such as cloud computing, Internet of Things, big data, and artificial intelligence, have emerged. These technologies are permeating the manufacturing industry and enable the fusion of physical and virtual worlds through cyber-physical systems (CPS), which mark the advent of the fourth stage of industrial production (i.e., Industry 4.0). The widespread application of CPS in manufacturing environments renders manufacturing systems increasingly smart. To advance research on the implementation of Industry 4.0, this study examines smart manufacturing systems for Industry 4.0. First, a conceptual framework of smart manufacturing systems for Industry 4.0 is presented. Second, demonstrative scenarios that pertain to smart design, smart machining, smart control, smart monitoring, and smart scheduling, are presented. Key technologies and their possible applications to Industry 4.0 smart manufacturing systems are reviewed based on these demonstrative scenarios. Finally, challenges and future perspectives are identified and discussed.     

航天发射仿真训练系统中的分级建模技术研究

计算机仿真技术已广泛应用于各种仿真训练系统,针对训练系统中不同训练任务和训练过程以及场景对象运动控制等方面的建模是其中一个关键技术。结合航天发射仿真训练系统的实际建模需求和具体问题,从任务级、过程级和实体级3个层次分析了不同的建模要求,综合运用XML、UML、Creator、Vega、MATLAB等软件解决了训练系统的分级建模问题。应用结果表明,通过分级建模能够解决复杂仿真训练系统的建模问题,对一般仿真训练系统的研制具有一定参考意义。