Research and Development of the Profibus-dp Card Based onWin CE.net

At present, the intelligent protocol chip - ASPC2 to set up the PROFIBUS- DP master station are so often used. In consideration of the price of the project and the advantage of the embedded system,we choose the PROFIBUS - DP protocol card, which is developed by ourselves.And we put it into the embedded system set by Win CE.net + ARM9.It is a totally new trial.Our embed- ded maser station is based on the Microsoft Windows CE. net operating system (OS) and the SAMSUNG SMDK2410…     

Mechanical Properties and Bake Hardening Behaviour of two Cold Rolled Multiphase Sheet Steels subjected to CGL Heat Treatment Simulation

In recent years, multiphase steels have become a material of choice for use in the car manufacturing industry owing to their excellent mechanical properties. It is anticipated that in the years to come these steels will show the highest increase in usage. A particular aspect of their potential is that multiphase steels often show good bake hardening (BH) properties. The main factors that govern the microstructures and the properties of these steels are the chemical composition and the production process parameters. In this work two commercial cold rolled sheet steels with different carbon content were investigated. In order to produce dual phase (DP) steels with a ferrite‐martensite microstructure, the as‐received material was subjected to heat treatment simulating continuous galvanising line (CGL) cycles with an overageing zone before the zinc pot. After a first CGL cycle predominantly ferritic microstructures with small amounts of martensite, pearlite and retained austenite were obtained, which resulted in deviations from typical DP properties, e.g. in the occurrence of discontinuous yielding. A higher line speed led to improved mechanical properties. BH prestrain was varied between 0 and 10%. While only very little bake hardening was observed without prestrain, with increasing prestrain the amount of BH was evolving quickly towards larger values of more than 60 MPa. Generally, the BH values were somewhat larger for higher carbon content. Finally, an optimised CGL cycle was simulated at laboratory scale with changes in the process parameters. Thus, characteristic DP microstructures resulting in desired mechanical properties were obtained. For these optimised conditions, BH₂ values in excess of 60 MPa were achieved for both steels investigated.     

基于PROFIBUS总线的万吨冷库制冷监控系统设计

介绍了采用PROFIBUS总线组成冷库制冷监控系统的设计思想、设计方法和设计内容。PROFIBUS总线和组态王软件在冷库监控系统中的应用．大大提高了冷库运行的可靠性和自动化水平。     

基于SlMATICS7 PLC的分布式控制系统实现

利用SIMATICS7PLC、工业以太网和PROFIBUS总线组成了分布式控制系统,具体描述了系统的构成以及组态实现。系统在逻辑结构上分为两层:现场设备层和网络控制层,PROFIBUS用于现场设备层,网络控制层采用工业以太网。用STEP7软件完成了系统的组态及控制程序的编写,并以水箱液位控制为例,说明了用户程序编写及调试的方法。过程的上位机监控利用WINCC软件实现。     

基于PLC的污水处理监控系统无线通讯解决方案

针对污水处理系统,采用HOLLiAS-LECG3PLC,提出了一种新的中央监控室与污水池现场设备之间的通讯解决方案,即污水池与中央监控室之间的无线通讯解决方案。     

PROFIBUS-DP与HART协议转换研究及其网关设计

介绍了PROFIBUS和HART两种现场总线的特点,探讨了两种现场总线的协议的转换方法,并成功开发出了可将两种总线进行互连的网关模块,实现了两种现场总线的底层互连。     

PLC及PROFIBUS—DP现场总线在石油钻机电传动系统中的应用

介绍了PLC及PROFIBUS-DP现场总线在石油钻机电传动系统中的应用,现场运行表明其性能良好。     

PLC在焦炉压力控制系统中的应用

介绍西门子PLC在焦炉压力控制系统中的应用，着重阐述应用PLC闭环控制模板FM455/33与CPU运算功能完成以常规PID控制为基础的集气管压力协调控制。针对系统中压力对象之间严重耦合、互相干扰的特点，采用模糊控制、多层规则控制思想，实现压力系统设定值控制（SCC）。     

基于PROFIBUS-DP网络的控制系统

提出了基于PROFIBUS -DP网络的控制系统结构 ,介绍了PROFIBUS -DP的基本特性及冷轧机组自动化系统的三层网络体系     

电力系统实时决策系统中的实时通信

为满足电力系统实时决策和紧急控制对实时性的要求，提出了电力系统实时决策系统中强实时通信的设计与实现方法。其中网络设计采用复合网络拓扑，通信协议采用无连接的UDP通信协议，软件设计采用多媒体定时中断和非阻塞通信模式。实时性测试证明了强实时通信的可行性。大量的实验数据显示该通信设计方案可满足电力系统实时性和可靠性的要求。