水泥厂利用AC800F与西门子S7-300实现ProfiBus DP通讯的实践

ProfiBus DP是用于制造工业过程自动化及建筑自动化的现场总线标准之一,是一种具有广泛应用范围的通讯系统,文中讲述了水泥行业ABB DCS系统AC800F现场过程站与设备专用PLC柜(西门子S7-300)间通过DP通讯的方式进行数据传输的应用案例,具有较强的现实指导作用。     

S7-200与Profibus-DP接口模块的设计

根据Profibus-DP产品发展现状,结合实际应用和降低成本的需要,提出S7-200与Profibus-DP接口模块开发方法,该模块以SPC3和P89C51RD为核心。同时,根据DP主站和DP从站数据通信以及具体工作过程对模块进行软件设计。     

Profibus-DP通讯在均化控制系统中的应用

<正>我公司先后对微粉均化、生料均化及钢渣均化等控制系统进行改造,通过在原均化系统的S7-200中加装EM277模块,构建中控S7-400与现场S7-200之间的DP通讯,并结合Step7编程软件和Wincc组态软件,实现中控对均化系统的控制。两年多的实际应用表明,此方法不仅高效实用,而且维护简便。本文以微粉均化控制系统为例,介绍改造方案。1改造的必要性     

现场总线控制系统在核燃料后处理萃取装置中的应用

基于Delta V、基金会现场总线(FF)和Profibus DP总线设计核燃料后处理萃取装置的FCS系统,并集成设备管理系统。给出了系统的控制网络、FF总线、Profibus DP总线、萃取装置脉冲系统、流体输送系统和界面控制系统方案。     

基于S7-300通过AS-i网络对现场驱动控制

以S7-300 CPU为主控制器,配合AS-i主站和从站模块,可以构成复杂的底层设备省配线网络,通过AS-i网络实现对现场设备的驱动控制。网络硬件系统构建、控制程序组织结构设计、从站信号的采集与驱动信号的输出以及AS-i网络的通断诊断是关键要解决的问题。     

塑料联合包装车间实时监测管理系统

塑料厂联合包装生产过程主要由几个环节构成,分别是包装、皮带传送系统和码垛机。现有的包装设备控制系统采用西门子的S7-300系列PLC,每台PLC系统分别带若干I/O模块,实现对现场不同设备的控制。但是,这几台PLC之间,并没用现场总线联结成网络系统,同时,上位监控计算机也没有投入使用,虽然每台PLC的自动化程度很高,但是由于包装机的工作状态并没有在生产实时系统中反映出来,管理人员不能及时获得联合包装的生产数据,给生产调度和管理带来了不便。     

白炭黑风送装置控制系统的设计与实现

提出白炭黑风送装置处理白炭黑硅粉输送过程的控制系统方案,介绍了使用西门子S7 -200、S7-300 PLC、TP177B.PN/DP触摸屏组成的控制系统实现送料的控制过程和联锁程序.     

PROFIBUS-DP网络检测工具在轧线介质系统中的应用

PROFIBUS-DP网络是工业自动化应用最广泛的现场总线。现场DP网络的稳定运行是轧钢生产线正常生产的重要部分,一旦介质系统停机,将直接导致轧线的设备停机,介绍了PROFIBUS-DP网络改造的方案以及进行网络检测算法的改进,取得了较好的效果。     

S7-400系列DCS在7.63m焦炉生产控制系统中的应用

介绍了S7-400系列DCS在7.63m焦炉生产控制系统中的应用以及整个自动控制系统的系统结构、控制方案、人机交互界面等。DCS系统较好地解决了大型焦炉生产过程中数据的采集及管理、复杂的顺序控制及安全连锁、与其他设备之间稳定可靠的通信等控制难点,实现了现场设备的精确集中监控。     

WinCC组态软件与下位机通讯方式的转换

正0前言乌兰察布中联水泥公司5000t/d生产线石灰石原料系统设计时采用独立中控系统。该系统上位机为WinCC 6.0组态软件,下位机为西门子S7-300CPU315-2DP PLC,采用CP5611通讯板卡按PROFI-BUS方式通讯。2014年12月,石灰石破碎系统在试车时中控无法与下位机通讯,为CP5611通讯板卡损坏。因无该备件,决定用现有一台CP343-1 lean以太网模块进行改造,使生产系统投入正常运行。     

聚合度对纤维素表面性能的影响

根据Washburn浸渍理论和van Oss-Good-Chaudhury组合理论及应用柱状灯芯技术测试了具有不同聚合度(DP)的纤维素的表面性能,同时与已报道的纤维素的表面能进行了比较。结果表明:纤维素的表面能随分子量的增加而增大,但主要是其Lifshitz-van der Waals力在起主导作用。研究还发现纤维素的表面能γS与聚合度DP之间的关系大致可以描述为:γS=37.56+0.02 DP,而纤维素的极性率P与聚合度DP之间的关系则是一种非线性关系,如:P=11.88-0.02 DP+9.10 DP2。     

40T混合磁体低温分配阀箱控制系统设计

40T稳态混合磁体低温分配阀箱控制系统基于S7-300系列PLC和WinCC组态软件,实现了集数据采集、数据处理、逻辑流程、泵阀控制、图形化监控以及数据记录与查询等功能于一体的自动化控制系统。该系统通过Profibus-DP与以太网相结合,再辅以硬件上DP转光纤的方式,实现了高效稳定的系统通信网络。利用WinCC组态软件实现的图形化人机界面,实时显示系统中温度、压力、流量、液位等各种数据,增加了系统的灵活性。     

Freezing point behavior of the ternary reciprocal salt pair system involving the morpholine and 2,2′-dipyridylamine salts of stearic and palmitic acids

Binary and quasi-binary freezing point data have been obtained to establish the freezing point diagram for the ternary reciprocal salt pair system, involving the morpholine and 2,2′-dipyridylamine salts of stearic and palmitic acids. The diagram shows that there are six crystallization surfaces representing equilibrium with crystals of MS, MP, DS, DP, DS·DP, and MS·DP. The compositions and primary freezing points of the six peritectic and five eutectic mixtures have been determined. From the diagram it is possible to predict for any molten mixture of these four salts under equilibrium conditions the temperature at which crystals of each component will appear on cooling, the yields of these crystals and the composition of the liquid phase at various temperatures, and the temperature at which maximum yields of crystals of the specific salts can be obtained. Presented at AOCS meeting in New Orleans, La., May 7–9. 1962. One of the laboratories of the Southern Utilization Research and Development Division, Agricultural Research Service, U.S.D.A.     

Production of pectic extracts from sugar beet pulp with antiproliferative activity on a breast cancer cell line

In the last years, sugar beet pectins have been the subject of several investigations involving extraction methodologies, chemical composition and functional properties. The structure of pectins, which depends on the extraction method, is decisive in their capacity to induce apoptosis on several cancer cell lines like colon, prostate and breast. In this work, sugar beet pectin extraction was performed in the following steps: lipid extraction with hexane, removal of soluble complex carbohydrates and proteins, and enzymatic treatment with amyloglucosidase, protease, and pectinase. The enzymatic treatment was carried out with Rohapect DA6L under the following conditions: 50°C, pH 4.0, 2% enzyme/substrate (E/S) ratio, 15 h, and a solid to liquid ratio of 1 ∶ 10. The pectic extract showed a degree of polymerization (DP) profile of 55.8% with DP≥7; 4.9% with DP6; 5.8% between DP2 and DP6 ; 4.7% with DP2; and 28.8% with DP1. The pectic extract was examined for its antiproliferative activity on the MCF-7 breast cancer cell line. At a concentration range of 12.5–25 mg/mL the pectic extract killed 80.6% of the cells, exhibiting a higher antiproliferative activity than 4-hydroxytamoxifen (4-OHT), a classical anticancer drug, which killed 56.5% of the cells.     

现场总线技术在回转窑传动控制中的应用

介绍了基于PROFIBUS现场总线的控制系统设计方法，利用ASIC芯片SPC3和双单片机AT89S52与AT90S8515设计了DP总线的接口电路和回转窑主电机控制系统，给出了其硬件及软件实现。     

Eco‐friendly durable press finishing of cellulose‐containing fabrics

To impart easy‐care properties to cellulose‐containing fabrics along with avoiding any harmful effects of formaldehyde on both the health and the environment, attempts have been made to use citric acid (CA) as an ester crosslinking agent along with different catalytic systems in the absence and presence of certain additives. Further, fixation conditions, type of crosslinking agent, as well as type of substrate have been studied. Results revealed that the enhancement in carboxyl content, performance properties, and the decrease in tear strength (TS) as well as in whiteness indices (WI) of the finished fabric samples were increased by increasing CA concentration up to 80 g/L and by raising thermofixation temperature from 140 up to 180°C for 90 s. Inclusion of triethanolamine hydrochloride (TEA. HCl), decreased the carboxyl content, TS, color strength K/S, as well as oily stain release rating (SRR) of the finished fabric samples along with an increase in bound nitrogen (%N), wrinkle recovery angle WRA, and an improvement in WI without affecting the durable press rating (DP). Within the range examined (0–30 g/L), increasing PEG‐600 concentration improved the wet resiliency, TS, as well as WI properties of the finished samples. Increasing DMDHEU ratio in the CA/DMDHEU crosslinking system gave rise to an increase in %N, WRA (dry and wet), DP, as well as in free CH₂O of finished fabrics, along with a slight improvement in WI values. On the other hand, the TS, carboxyl content, K/S, SRR values of the finished fabric samples were lower at a higher DMDHEU ratio. Increase in carboxyl content, %N, WRA (dry and wet), DP and SRR, as well as extent of post dyeing (K/S) of the treated fabric samples upon using different ester crosslinking agents followed the descending order: citric acid > pyromellitic dianhydride. The opposite holds true for the TS, and WI values. Among the esterifying catalysts used, and for a given set of finishing conditions, NaH₂PO₂ · H₂O proved to be the most effective one, and the following order of effectiveness may be drawn: NaH₂PO₂ · H₂O > K₂HPO₄ > Na₃–citrate > Na₂–tartrate. Inclusion of silicone softener in the finishing formulation brought about an improvement in softeness degree, WRA, %N, DP, TS as well as K/S values along with a decrease in carboxyl content, SRR, and WI values of the treated fabric samples, regardless of the used silicone softener.The performance properties of the finished fabric samples were determined by the type and nature of the substrate. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2243–2253, 2002     

Polymerization of vinylchloride by t-butylmagnesiumchloride

Summary Vinylchloride has been polymerized in THF by t-butylmagnesiumchloride as an initiator. Saturated oligomers of DP=1–3 have been prepared and analyzed by joint HPLC and C-13 nmr spectroscopy. The structure of the oligomers confirm a regular head-to-tail enchainment of the monomer during initiation and propagation.     

PES改性低温固化双马树脂固化动力学研究

以聚醚砜(PES)作为双马树脂(BMI)的增韧剂,以3,3′-二烯丙基双酚A(DP)作为改性剂,采用非等温DSC(差示扫描量热)法,研究了PES改性低温固化BMI/DP体系的固化反应动力学。结果表明:根据Kissinger方程、Crane方程和n级动力学模型计算出BMI/DP体系的固化动力学方程为dα/dt=2.1×10~(11)(1-α)~(1.07)e×p(-13.89×10~3/T);采用红外光谱(FT-IR)法跟踪固化反应过程,确定了BMI/DP体系的固化工艺为"130℃/3 h→140℃/1h→160℃/2 h→180℃/2 h"。     

Impact of Temperature on Analog/RF Performance of Dielectric Pocket Gate-all-around (DPGAA) MOSFETs

Silicon - In the present paper, the dielectric pocket (DP) technology has been employed in the Gate-All-Around (GAA) MOSFETs to improve the scalability and performance of the device. The upgraded...