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浅变现场总结开放系统的系统集成与应用集成 总被引:2,自引:0,他引:2
本讨论现场总线国际标准多元化趋势下基于现场总线开放系统的集成技术,通信协议 ,标准功能块,OPC,OFC在系统集成,应用集成中的作用。 相似文献
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现场总线技术在楼宇自动化中的应用 总被引:2,自引:0,他引:2
现场总线是企业底层数字通讯网络,是连接微机化仪表的开放系统。从一定意义上说,智能仪表就相当于一台台微机,它们以现场总线为纽带,连成网络系统,完成数字通讯任务,可以说现场总线系统就是控制领域的计算机局域网络。本文详细阐述了LonWorks总线和其技术特点及原理,我将LonWorks技术应用在楼宇自动化系统中。 相似文献
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基于PROFIBUS总线的铜箔后处理生产线传动系统 总被引:1,自引:0,他引:1
论述了铜箔后处理生产线的特点及控制要求、现场总线的定义、PROFIBUS现场总线的体系结构、参考模型和网络结构。同时介绍了使用交流伺服驱动器、SIMOTION和触摸屏进行组网的方法。 相似文献
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提出一种基于工业以太网的高速现场总线GSK-Link,它是一种数字化、串行网络的数据总线,用于机床数控系统各组成部分互连通信。GSK-Link修改标准以太网的七层参考模型为三层参考模型,采用环形或线性网络拓扑结构,采用专用的应用层和数据链路层协议,满足高速现场总线的高实时性、高可靠性和精确同步性。 相似文献
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现场总线体系结构的研究 总被引:1,自引:0,他引:1
在讨论现场总线体系结构的基础上,指出了现场总线应该是一种压缩的体系结构,并能与开放系统接口相容.按是否使用网络层和(或)传送层,可构成四种适用的现场总线,并根据功能成本和性能比,选用传送层四层体系结构比较适宜. 相似文献
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前言1978年国际标准化组织ISO建立了一个委员会,从事开放系统体系结构的研究,从计算机网络的观点提出了开放系统互连参考模型OSI/RM,实际上是用来指导实现不同厂商、不同计算机系统之间的互连。到了九十年代,开放系统已经成为国际计算机行业界共同关心和... 相似文献
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基于Lon Works现场总线技术的局部操作网(LON)是目前唯一符合国际标准化组织(ISO)开放系统互联(OSI)标准全部七层协议的现场总线控制网,已广泛用于各个领域。本文介绍由Neuron3150神经元芯片和PSD913F2在系统可编程接口芯片、专用FIT—10A收发器构成的高性能智能控制模块的设计、调试和应用。 相似文献
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N. I. Aristova 《Automation and Remote Control》2016,77(5):881-894
Ethernet evolution history and data packet assembly in the OSI model are discussed. Limitations impeding Ethernet application in industrial automation are formulated. The paper notes that real-time Ethernet operation requires additional mechanisms which allow to avoid collisions. The mechanisms in Ethernet-compatible real-time protocols such as EtherNet/IP, PROFINET, EtherCAT, Powerlink, Modbus TCP, Foundation Fieldbus HSE, and SERCOS III are analyzed. The IEEE1588 standard enabling high-precision synchronization of network users’ clocks is examined. Characteristics and application fields of wireless Ethernet networks are listed. Ethernet redundancy mechanisms such as STP, MSTP, MRP, Link Aggregation, PRP, and HSR are considered. Innovative solutions such as powering over Ethernet and embedded Ethernet switches are described. 相似文献
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FF(基金会现场总线)能提供大量的设备信息,能将控制功能下放到现场,是对传统工业过程仪表和控制的革新。结合工程设计的需要,文章探讨、总结和分析了FF总线控制系统的设计原则和基本要求。 相似文献
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当前电子邮件发展的特点是标准化,CCITT和ISO联合公布的CCITTX.400/ISO10021电子邮件标准为电子邮件的标准化奠定了基础。而X.400标准是按照OSI参考模型制定的,由于当前OSI参考模型推广还不够广泛,因此需要在异构网络环境下实现X.400电子邮件系统。本文提出了解决网络异构问题的集成开发平台应其有的特点,结合应用环境介绍了在TCP/IP、DECNET、OSI运输层之上实现集成 相似文献
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Yanghee Choi 《Computer Standards & Interfaces》1986,5(4):267-270
Research and development on OSI became a key issue in many Korean R&D projects related to computer, telecommunications and services. The Korean computer and communications industry also finds their possible area of expansion through OSI-compatible products. But claiming OSI as the future direction in Korea at the national/government level is not near. This short paper presents various present and future R&D projects on OSI in Korea. These include ISDN, LAN, Videotex, Teletex, protocol testing, mixed mode terminal, network architecture etc. 相似文献
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FF现场总线控制系统 总被引:4,自引:1,他引:3
本文阐述了基金会现场总线控制系统的网络拓扑结构。针对现场总线控制系统体系结构的特点,对现场设备、系统结构及协议各层作了具体的分析,同时还对FF产品及开发步骤作了简要介绍。 相似文献
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Ali Fadaei Karim Salahshoor 《International Journal of Control, Automation and Systems》2011,9(5):823-833
This paper presents a novel fuzzy auto-tuning methodology to continuously adapt PID control actions without interrupting the
normal process operation. New auto-tuning rules are introduced to schedule a gradual and guided activation of each individual
P, I and D control mode in three adjustable functional control zones. An auto-scaling procedure has been incorporated to generalize
the autotuning scheme to efficiently respond to any set-point change outside a pre-defined operating span. In contrast to
existing auto-tuning algorithms, the proposed scheme is not an on-demand auto-tuning methodology and hence does not require
alertness of an experienced engineer to initiate and supervise its initial operation in a separate commissioning identification
pre-test. This interesting feature provides a new perspective on PID auto-tuning approaches. Performance of the proposed auto-tuning
scheme is practically evaluated in a real pilot plant within a networked control system (NCS) configuration, realized by industrial
Ethernet and Foundation Fieldbus technologies. An extensive series of test scenarios has been conducted to explore efficiency
of the proposed auto-tuning methodology to cope with fixed and varying operating set-points under uncertain and variable network
transmission time delays and external disturbance. 相似文献
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