共查询到20条相似文献，搜索用时 93 毫秒
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文章对工控组态软件MCGS与可编程控制器PLC的数据采集系统做出相应的分析,PLC的中文名称是可编程逻辑控制器,其采用了西门子S7-300系列,组态软件使用的是MCGS系统,本系统是通过工业以太网来进行通信的,用ODBC方式来进行数据的储存,采用的外部数据库是SQL Server 2008数据库。文章对组态软件MCGS和PLC之间的通信过程和数据储存与外部数据库之间的数据交换方式进行细致的分析。 相似文献
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挤压膨化技术在食品工业、油脂和酿造等多个领域中得到了应用.随着电器控制的普及,可编程控制器(PLC,Programmable Logic Contorller)广泛应用于挤压膨化技术中.为此,以工控机和CP5611卡为上位机,应用FameView组态软件为开发软件,实现了上位机监控界面的显示;以PLC(西门子 S7-200)作为下位机,并与执行机构连接,应用RS-485串行通信协议进行上下位机的通信.对挤压膨化机压力检测进行了详细分析,指出了PLC在挤压膨化机中应用特点和发展趋势. 相似文献
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随着通讯技术的卓越发展,计算机控制技术已深入到各个工业生产领域,高效化、科技化是目前各技术领域追求的目标,为了提高工作效率、实现产业化发展,工业企业对自动化控制的要求也越来越高,自动化控制应具有高可控性与高灵活性,西门子PLC的应用满足了上述要求.文章介绍了PLC的基本信息特点以及应用的实施条件与故障维护. 相似文献
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在互联网计算机技术迅速发展背景下,PLC作为工业生产设备而研发出的电子装置,得到了广泛的应用。西门子工业制造PLC具有明显的竞争优势。本文结合西门子工业控制的PLC实际情况,结合具体应用与技术进行分析。 相似文献
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【目的】分析西门子S7-1200系列PLC、数控机床、伺服系统的概念与原理,探究PLC技术在数控机床控制中的实际应用以及维修调试的方法。【方法】笔者重点论述了西门子S7-1200系列PLC对机床的具体控制以及部分设备的运行原理,详尽地展示了主电路图、整体接线图和总设计流程图。【结果】应用西门子S7-1200系列PLC控制的机床可以根据逻辑运算来实现相应的功能,比如加工零件、生产制作不同的产品,不管是对军用还是民用产品都可以进行加工与设计。【结论】PLC具有模块化、抗干扰性强、运行可靠等优点,可成功应用于数控机床电气控制,显著提高机床工作的准确性和维修效率,从而提高数控机床的控制能力,更好地节约人力物力资源,为我国未来工业智能化、绿色化、高效化发展作出贡献。 相似文献
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由于自动控制系统的升级及自动控制产品的更新换代,本文对柔性生产线系统中的喷涂烘干单元进行了监控系统改造,改造后的系统新一代工业现场总线技术Profinet协议,以S7-300PLC作为主站,S7-1200PLC作为从站,以HMI(WinCC Comfort)作为监控人机界面,整个系统仅使用西门子全集成自动化软件TIA PROTAL,使自动化系统的数据交互更便捷,通信传输更快速,设计更直观、高效。 相似文献
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介绍了西门子S7-200PLC在云南镇康县南华勐堆糖业有限公司污水处理自动控制系统中的应用。阐述了基于CASS工艺的污水自动控制系统,该控制系统由上位机、下位机以及现场仪表和执行部件组成,上位机采用组态王软件实现人机交互,下位机采用西门子S7-200系列的PLC实现数据采集及系统控制。实践证明,该系统运行可靠、稳定,能够满足工业生产的需求。 相似文献
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Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m−1) and an infiltration rate of 5.8 mm day−1. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day−1), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day−1 was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration. 相似文献
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车用发动机润滑油失效规律与更换周期研究 总被引：7，自引：0，他引：7
研究在正常使用条件下１０Ｗ／３０－ＱＣ级润滑油用于某型车用发动机时所表现的失效规律,确认期服从两参数Ｗｅｉｂｕｌｌ分布,并给出分布的尺度参数η和形状参数ｍ之最佳线性无偏估计（ＢＬＵＥ）同时,还为定量分析,计算车用发动机润滑油的使用可靠性和合理确定其更换周期提供了一套可供借鉴的方法,并给出了具体的计算实例。 相似文献
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赵国杰 《农业机械化与电气化》2011,(4):106-107
乡（镇）农技推广体系是农业发展的关键。介绍朝阳市农业技术推广体系的现状,针对目前体制及运行机制、服务手段等方面存在的问题,提出适合朝阳市乡（镇）农技推广体系改革与发展的对策,以期对全省农技推广体系改革和发展起到一些借鉴作用。 相似文献
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苑庆刚 《农业机械化与电气化》2010,(3):52-54
草莓果味酸甜爽口,营养价值高,为人们所喜爱的应市鲜果之一。由于草莓易受损伤和微生物侵染,因此其采收、贮藏过程极为重要。介绍草莓采收过程中的注意事项以及11种贮藏保鲜技术的实施步骤和操作方法,推介9种加工方式,为草莓产业化提供技术支持。 相似文献
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瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。 相似文献
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对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。 相似文献
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对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。 相似文献
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在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。 相似文献
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About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered. 相似文献