基于串口ActiveX控件MsComn的LabVIEW与PLC通信的实现

应用图形化编程语言LabVIEW实现PC机与西门子PLC串口通信,通过使用ActiveX控件-MsComn实现中断读取下位机的数据,提高监测系统实时性与可靠新,应用西门子的S7-200的模拟电位器,实现了温度和压力的监测系统设计.     

The Application of PLC in the Overhead Crane

This paper is about the application of PLC (Model S5-135U made by Siemens) in the overhead crane. It is mainly about the working principles and application of PLC Model S5-135U.     

MULTI-FUNCTION VEHICLE NAVIGATION AND MONITORING SYSTEM IN URBAN AREAS

A vehicle navigation and monitoring system integrated by a high precision navigation system and a vehicle black box is studied to satisfy the demand for the intelligent transportation system (ITS). Firstly, the architecture of the system is proposed. Then the integration scheme of global positioning system/dead reckoning/bluetooth beacon/map matching (GPS/DR/BB/MM) with the hluetooth assistant positioning technology, and the algorithm of the Kalman filter for the integrated GPS/DR are investigated. Finally many field trials for principle prototypes are made. Experimental results show that the proposed integrated navigation algorithm is effective and feasible, and the function of the vehicle black-box is realized.     

运用MCGS构建PLC仿真实践教学系统

根据PLC课程的教学特点,针对目前很多高校该课程实践环节的现状,提出运用MCGS组态软件技术构建PLC仿真实践教学系统构想并予以实现,以缓解实践教学与设备投入不足之矛盾.

Abstract：

Based on the characteristics of PLC curriculum and the current problems in practice teaching in many colleges, a PLC simulation practice teaching system using MCGS is constructed and implemented,which reduces the pressure resulting from the deficient equipment for practice teaching.     

基于组态软件的分布式多点温度远程监控系统

以组态软件为平台,通过PLC构建了一个分布式温度自动控制系统,实现对现场温度的自动控制.按大林算法设计温度调节器,并对其控制特性进行了分析,给出了控制结果.借助组态软件良好的人机界面,完成温度的动态显示和实时温度曲线的记录,同时使系统数字化,智能化,网络化,并实现远程控制.

Abstract：

Using the configurative software as a platform, an automatic distributed temperature control system for temperature is designed on the scene with PLC. Its aim is to design a temperature controller which uses DALIN algorithm. Its control characteristics are analyzed, and the results of control are given. With the help of a good man-machine interface of the configuration software, it can display temperature dynamically and record the real-time temperature curve. At the same time the system can realize digitization, intelligence, network and remote control.     

PLC在节能型日光温室温度监控系统中的应用

利用收集验证完善得到的PPI协议实现了上位机对PLC的监控,将西门子S7-200 PLC与各个控制节点相连,上位机通过控制PLC来实现自动和手动控制各个节点,以实现节能型日光温室温度监控系统的自动化.     

一种基于工业以太网的PLC与PC数据通信实现方法

给出了在VC++和SiemensSimatic.NET开发环境下,PC机通过普通网卡与西门子S7-300PLC进行数据通信的实现方法,并就实现过程中的软件设计和系统组态问题进行了详细阐述。     

BEACON SYNCHRONIZATION TECHNOLOGY FOR “BEIDOU” TERRESTRIAL IMPROVEMENT SYSTEM

Synchronization is an essential technology in the radio navigation system. The technique for improving the “Beidou” positioning ability is presented through constituting the terrestrial improvement system, and the beacon synchronization of the improvement system with the “Beidou” one-way time transfer model is realized.The direct digital synthesis (DDS) is adopted to generate the pseudo-random code clock having high precision and stability. Meanwhile, the CPLD device is used to design the synchronization pulse picking-up module, the spread spectrum PN code generator and the spread spectrum modulator. Measurement results indicate that the beacon synchronization has the high precision and the stability.     

一个新非自治超混沌四维二次系统及其电路实现

在三维二次混沌系统的基础上增加一个含控制信号的状态变量,组成一个新的非自治超混沌四维二次系统.该系统的基本动力学特性的变化主要依赖于控制信号频率的改变.通过系统的Lyapunov指数谱、分岔图及数值仿真表明,在不同的频率参数下,该系统能够体现周期、拟周期、混沌、超混沌的动力学特性.最后设计了一个模拟电路,进一步验证了其特性.

Abstract：

Based on the three-dimensional quadratic chaos system, this paper constructs a new four-dimensional quadratic non-autonomous hyperchaos system by adding a state variable with the controlling signal.The change in the basic dynamics characters of this system is mainly realized by varying the frequency of the controlling signal. The different chaos dynamics characters of this system such as periodicity, quasi periodicity, chaos and hyperchaos at different frequencies is shown by Lyapunov spectrum , bifurcation diagram and numerical simulation. The results of the experiment are further shown to be consistent with the numerical simulation by designing an analog electronic circuit.     

一种新型实用温室温度控制系统设计

目前国内温室环境测控系统主要应用于大型现代化温室,而在普通农户中难以推广.研究利用分布式结构和多CPU设计思想,设计一个实用小型温室温度控制系统,系统由主机、从机和强电控制组成.从机是温室参数采集系统,它由ATmega16单片机、单总线数字温度传感器DS18B20组成,完成温度的采集功能;主机由RS-485接口与从机进行通讯,为用户提供良好的控制界面,方便进行人机交流,实现对温室温度的远距离测控、显示、存储等综合管理.整个系统成本较低,适合普通农户使用.

Abstract：

At present,the conventional temperature measuring and controlling systems are mainly utilized in large modernized greenhouses in China and are,therefore,difficult to be popularized in the greenhouses of farmer households.In this study,based on a designing idea of multilevel distributed frame and multiCPU,a practical miniature temperature measuring and controlling system is developed,which is composed of a host computer,a slave computer and an intense current controller.The slave computer,composed of an ATmegal6 chip microcomputer and al-wire digital temperature senor DS18B20,is used as a gathering system to collect the greenhouse temperature parameters.The host computer,communicating with the slave computer by RS-485 interface,is used to communicate with man by friendly interactive graphics,and to comprehensively manage the greenhouse environmental parameters of controlling,displaying and storing,and to display the operational states of greenhouses.Owing to its low cost,this system is expected to be popularized successfully in the greenhouses of farmer households.