基于API实现工控机的高速大数据量通讯

针对工业自动化系统中,实现控制系统与工业控制计算机之间的数据通讯,存在的数据的更新周期长(一般在500ms以上),不能满足工业控制中的特殊应用,即数据量大且要求的数据采样周期短的问题,结合工程实践经验,描述如何使用S7API实现西门子S7系列控制系统与计算机之间的高速大数据量通讯。所描述的系统实现了以10ms为周期进行连续100个数据字的读取任务,并且经过现场考核运行证明了系统的稳定性和可靠性。     

西门子S7—200系列PLC在配料生产线上的应用

本文对西门子S7-200系列可编程序控制器应用于配料生产线电气控制系统的设计思想作了介绍,对系统的硬件组成和软件设计作了较为详细的阐述,现场应用情况表明,该PLC控制系统工作可靠,操作方便.     

西门子故障安全型PLC在焊管生产线上的应用

为了提高设备的运行安全,保障操作人员的安全,尽可能减少事故损失,介绍了西门子故障安全型PLC在焊管生产线上的应用情况。将该故障安全型PLC与普通PLC进行了对比,对其在焊管生产线上的设备构成以及参数设置进行了论述,并对应用情况进行了风险图评估、系统评估以及西门子SAFETY评估工具评估。安全评估结果显示,该西门子故障安全型PLC能够有效提升焊管生产线的安全运行性能。     

基于西门子PLC的高层住宅供冷暖系统设计

为了实现高层住宅冷暖控制和提高供暖系统效率,提出了基于西门子PLC的供冷暖系统设计方案,并完成了系统的硬件选择和整体控制方案设计。方案采用了工业上常用的串级闭环控制、建立了变量并组态连接动态化、列出了控制流程。完成了系统WinCC人机控制界面帮助操作人员了解并控制整个系统。系统仿真实现了对水源系统、消防水池、高低区、补水、回水的控制,达到了设计要求。     

PLC课程教学案例研究

PLC作为离散制造业工业自动化最基本的技术平台,怎样教,如何学,效果不同。文中列举了PLC六个独特的教学案例,对于深化PLC的教学具有一定的借鉴意义。     

Mashup and Assemblage in Digital Workflows: The Role of Integrated Software Platforms in the Production of Architecture

Digital technology is eliminating the separation between design and making that had existed since the Renaissance. But in order to seamlessly produce experience rather than just artefacts, architects have been turning to software developed for other fields. Adam Modesitt – assistant professor at the New Jersey Institute of Technology and founding principal of New York-based Modesitt Design – discusses the new directions that this hybridisation of workflows is allowing architecture to take.     

浅谈得利满与西门子高密度沉淀池的优缺

主要讲述神华包头煤制油化工有限公司煤制烯烃项目中污水处理及污水回用过程中,采用的两种水处理专利技术,在设计上与生产运行中的相同点和不同点,指出了在实际生产运行过程中,两种水处理专利技术存在的各类运行缺陷,并根据这两种水处理工艺技术,在实际生产运行过程中暴露出的生产运行缺陷分析,得出这两种水处理专利在实际生产运行方面的优缺,为今后水处理工艺选择提供了参考。     

基于PLC的气动机械手的原理及应用

介绍了一种基于西门子PLC控制的气动机械手的工作原理、气动系统的设计方案、PLC部分顺序功能图和程序,体现了PLC和气动机械手在工业生产中的重要作用.     

龙门轴在西门子与海德汉数控系统中的应用

基于西门子840D系统与海德汉iTNC530系统,对龙门轴在数控机床中的应用进行了详细的比较分析.介绍了这两种不同的数控系统应用到龙门轴的控制上的共性要求及不同的应用特点.     

Review: Influence of alloy addition and spinel coatings on Cr-based metallic interconnects of solid oxide fuel cells

Solid oxide fuel cell (SOFC) is the modern eco-friendly technology of fuel cell power generation system. It generates electricity from a redox chemical reaction without producing hazardous gases. It consists of anode, cathode and electrolyte. It is operated in the form of stack connected by interconnects to boost-up power output. The recent development of low-temperature (600 °C–800 °C) brings an opportunity to use metallic interconnects over ceramics. Cr-based metallic interconnects are one of the prominent metallic interconnects. They offer chemical inertness, thermal stability, compatible coefficient of thermal expansion and highly dense structure. However, the Cr-migration towards the cathode side is the major problem in them which adversely affect the SOFCs performance. Therefore a good oxidation resistance without sacrificing electrical conductivity is required. To resolve this issue, several alloying elements and spinel coatings have experimented. These spinel coatings are the thin solid films of Mn, Co, Cu and rare earth metals. This review concluded that the Mn–Co based spinal coating showed excellent performance in reducing the Cr-migration in specially designed expensive Crofer 22 APU interconnect. However, the emerging low-cost ferritic interconnects also show their best results with Cu–Fe based spinel coating. Among them, the SUS-430 interconnect shows the equivalent performance of Crofer 22 APU interconnect after surface treatment and appropriate Cu–Fe based spinel coating. Therefore, it can replace the Crofer 22 APU interconnect on a cost basis.