万能轧制线实时数据采集系统中的PLC与PC通信方法

根据万能轧机生产线现场控制的特点,确定了轧制参数实时采集系统中PLC和PC之间的关系,以及硬件之间的互连方法.并根据实时数据传输的要求,采用Socket方式编写了PLC与PC机之间的C/S通信程序,实现了高速以太网上的正确数据采集.     

基于DF1协议的通讯在铝厂烟气净化监控系统中的应用实践

介绍了基于DF1协议的通讯在铝厂监控系统中的应用实践。AB PLC与PC机之间采用DF1协议进行通讯,利用此协议制定合适的通讯流程,实现了PC机对远程设备的控制与监视,程序可移植性较好。     

Siemens PLC的PPI通信协议的解析与应用

Siemens PLC在工业自动控制领域有广泛的应用,但对于普通用户和改造项目,利用PPI协议实现PLC与上位PC机通信一直是一个瓶颈.通过对PPI协议的解析,在上位PC机,可编写基于VB6.0的通信模块以实现与PLC通信,可以方便实现控制对象的状态参数的显示、记录及生产过程的控制.     

自动控制系统在高浓度尾矿设备控制中的应用

尾矿处理是对尾矿中的水分进行回收,并将高浓度的尾矿进行膏体堆放。即能节约工业生产用水,又能减少堆放空间。系统采用了SIMENS S7-300系列PLC对生产进行控制,并对主要参数进行历史记录,该系统通过工业以太网实现各个PC和CPU之间的通讯。每台PC可以实现控制的同时检测其他CPU的数据。系统自动控制的投入从而减少了运行人员的工作量,提高设备自动化水平。     

984主机升级为Quantum

济南钢铁集团总公司第一烧结厂 2× 90m2 烧结机于 1994年 10月投产 ,电控系统使用 5台Modicon 984系列PLC ,根据烧结工艺划分成 5个区域 ,分别控制生产设备启停、工艺联锁和部分仪表 ,称做 1PC、2PC…… 5PC。每台PLC有一个本地站和若干远程I/O(即RIO)站 ,本地站与RIO之间使用     

浅析PLC在电弧炉炼钢电极自动调节系统中的应用

电弧炉电极自动调节系统原控制系统采用西安电磁机械厂的电阻、电容、电位器等控制原件组成的一块综合控制板和三块控制板分别控制三相电极升降，该控制系统，不仅故障率高，且控制不太精确。而现在采用的PC＋微控制器（单片机）式调节器的PLC控制不仅故障率低，且控制精确，为我车间降低生产成本做出了一定的贡献。本文旨在介绍目前较为流行的PC＋微控制器（单片机）式调节器的PLC控制应用于电弧炉电极调节系统的实践经验、设备配置、控制模式及应用效果。     

稀土选矿浮选过程控制系统设计

文章以某新建稀土选矿厂浮选流程为研究对象,在熟悉其工艺设备组成及工作原理的基础上,重点对浮选温度、浮选浓度等控制系统进行剖析与研究,该流程控制系统实行DCS控制,上位机采用PC计算机,下位机采用PLC系统作为现场控制单元,以灵活多样的分布式I/O接收现场传感检测信号,实现对稀土浮选流程的自动化控制。     

鞍钢1450mm平整机过程控制系统开发及应用

介绍了鞍钢冷轧4#线1450 mm平整机组过程控制系统概况,包括计算机硬件、软件系统,控制原理及PLC与和生产控制计算机的通讯方式等。硬件方面采用惠普PC服务器,软件方面采用Windows2000 Server操作系统,开发工具采用VB6.0,数据库系统采用Oracle9i。过程控制系统与PLC的通讯方式采用基于TCP/IP协议,与生产控制系统通讯采用SQL.net技术。运行实践证明,该过程控制系统能够满足生产实际需要。     

PLC和WinCC在烧结自动控制系统中的应用

介绍西门子PLC在烧结自动控制系统中的成功应用。该系统采用三电(EIC)一体化控制,实现了仪表、电气及自动控制系统的集成控制。系统采用集散型PLC实现分布式网络控制,确保系统运行稳定可靠。     

1500冷轧机分布式控制系统

主要介绍了1500冷轧机自动控制系统的网络构成及分布式控制技术的应用。结合冷轧机电控系统调试工作,阐述了直流传动系统中采用PROFIBUS—DP现场总线技术,实现西门子PLC与ABB全数字直流传动系统、机列操作和油系统以及通过以太网实现PLC之间、PLC与上位机之间的通讯和控制。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.