共查询到20条相似文献,搜索用时 62 毫秒
1.
虚拟仪器与PLC串口通信的实现 总被引:6,自引:0,他引:6
介绍了一种在线测量设备中虚拟仪器与可编程控制器(PLC)串口通信的实现方法。在LabVIEW环境下工控机与PLC串口通信可靠性差,通过采用最佳信息冗余法保证了信息传递的可靠性,使通信成功率达到100%,同时提高了通信传输效率,满足了在线测量的要求。现场使用表明该通信方式运行稳定。 相似文献
2.
基于FPGA的多功能多路舵机控制器的实现 总被引:1,自引:0,他引:1
利用现场可编程门阵列(FPGA)构建了一个可编程片上系统(SOPC)实现能同时控制多个伺服舵机的控制器,用于遥控/自控飞艇的控制。该片上系统的硬件部分主要由串口通信模块、NIOS-IICPU模块、脉宽调制(PWM)信号发生模块、PWM信号脉宽计数模块以及多路开关模块组成。软件部分主要是串口通信软件。其中,PWM信号发生模块可通过串口通信灵活地设置每路PWM信号的占空比。仿真和实验结果表明,该控制器可根据串口通信数据,可靠地对每个伺服舵机进行独立控制,且舵机运行平稳无颤振。 相似文献
3.
本文以三菱小型可编程控制器为例,介绍了PLC与计算机之间的串口通信设计,重点介绍了利用VB6.0中MSCOMM控件进行串行通信的实现方法。 相似文献
4.
串口通信方式是工业控制中常用的通信方式,常规的串口通信编程采用动态链接库的方式,编程比较复杂。设计了一种基于LabVIEW的电机控制系统,通过LabVIEW中的VISA控件实现了PC机与现场可编程门阵列(FPGA)的串口通信,控制电机的运行。与常规的方法相比,此方案提高了数据传输的实时性而且降低了编程难度。系统具有数据交换、仪器状态检测、数据读取、命令控制等功能。在实际运行中,该系统操作简单,响应速度快,能够连续、动态地改变电机的转速,实现了工业控制的自动化。 相似文献
5.
介绍了可编程计算机控制器(PCC)的特点及其在塑料挤出机上的应用。通过软、硬件的分析,说明了可编程计算机控制器比常规可编程控制器性能更加优越,特别是它的多任务处理操作系统和通信能力。PCC实现挤出机温度的智能化控制;通过CAN现场总线实现主站PCC2005与从站PCC2003之间的通信。 相似文献
6.
PLC与单片机串行通信的应用 总被引:1,自引:0,他引:1
本文以工业大功率微波炉控制系统为例,着重介绍了可编程控制器(PLC)与单片机串行通信的实现方法,该方案实现简单,通讯可靠.在实际应用中取得了良好的控制效果. 相似文献
7.
8.
基于无线通信和串口通信技术,设计了一种分布式的水厂实时监控系统,阐述了监控系统的原理、过程及软件、硬件的配置.实现了可编程控制器、通信技术、遥控遥测技术的结合. 相似文献
9.
针对在噪声干扰比较大的工业环境下对RS-422通信的需求,该设计采用TMS320F2812作为主处理器,利用外部接口(XINTF)片内的两路SCI异步串口,并通过可编程逻辑器件EPM240T100C5N(CPLD)两片MAX3160连接,实现了上位机和下位机之间、下位机和下位机之间的RS-232通信、RS-422通信. 相似文献
10.
串口通信广泛应用于工业控制领域,PDA利用自身串口通信功能和使用方便的特点,使得以它制作的线控掌上控制器具有广泛的应用范围和良好的应用前景.介绍了利用EVC实现PDA和VxWorks通信软件的关键技术. 相似文献
11.
张涛 《计算机测量与控制》2015,23(1):86-89
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. 相似文献
12.
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. 相似文献
13.
《Information & Management》2016,53(6):787-802
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. 相似文献
14.
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. 相似文献
15.
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. 相似文献
16.
《浙江大学学报:C卷英文版》2014,(11)
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 相似文献
17.
Zhao-hui WU 《浙江大学学报:C卷英文版》2014,(10)
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 相似文献
18.
《浙江大学学报:C卷英文版》2014,(10)
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 相似文献
19.
20.
《浙江大学学报:C卷英文版》2014,(8)
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 相似文献