基于USS协议的金相切割机通信系统研究

针对大型金相试样切割机的控制要求,设计了由OMRON CPIH PLC和西门子变频器以及NT31C触摸屏组成的调速控制系统.采用基于RS-485接口的USS协议,利用PLC与变频器之间的通信,实现了对变频器的控制和监控,有效地减少了系统布线,提高系统的稳定性和抗干扰能力.通过触摸屏可以将切割机的工作状态实时、准确地显示出来.该系统有效提高了金相切割的质量和效率.     

PLC主从站与触摸屏在自动化饮用水生产线上应用

介绍了PLC主从站控制模式和触摸屏在乐百氏自动化饮用水线上的应用,PLC主从站及触摸屏控统的硬件配置,以及触摸屏画面制作和主从站联机运行过程.     

触摸屏在井下水泵控制装置中的应用

结合触摸屏和PLC技术,设计了一套煤矿井下水泵控制装置,详细介绍了西门子触摸屏和PLC在井下水泵控制装置中的应用,阐述了触摸屏与PLC进行数据交换、连接、通信的方法,给出了触摸屏组态软件的编程步骤。     

西门子变频器的应用 第5讲 MM440变频器与HMI直接通讯

西门子自动化产品包括PLC、触摸屏和变频器,常见的控制方式是触摸屏与PLC相连,PLC与变频器相连,而本文主要阐述的是西门子MM4系列变频器与HMI的直接通讯应用,实践证明该方式是有效的。     

基于PLC和人机界面的中央空调及制冷实验平台控制系统

介绍了PLC和触摸屏组合在中央空调及制冷实验平台控制系统中的应用。详细阐述了PLC程序的设计方法、设计过程中遇到的问题以及PLC与触摸屏的通信方法,并对触摸屏组态画面的设计进行了说明。PLC和人机界面（触摸屏）通信采用了MPI通信方式。目前该控制系统已经在河海大学中央空调及制冷实验平台上投入运行,运行效果良好。     

汽轮发电机在线监测系统的设计与分析

设计了一个汽轮发电机在线监测系统,以监测汽轮发电机运行过程中的各种参数.主要硬件包括各种传感器、西门子PLC以及触摸屏等;软件设计中PLC使用STEP7进行编程,触摸屏使用EB8000编程.PLC和触摸屏相结合,PLC作为控制器,具有模拟量输入、输出功能,能够满足汽轮机的调节和应用;在触摸屏中设定参考值,与实际值进行比较,监测过程中各种参数的变化,对汽轮发电机进行科学的预知和预判,以保证其能够稳定运行.系统优点是能够实时监测各种运行参数和状态,并可直接在触摸屏上显示,如果发生超速或者超温等故障,能直观地发现并发出报警信号.汽轮发电机在线监测系统的应用领域很广,主要在中大型热电厂、水电厂以及各种核电站.     

二氧化氯发生器计算机监控系统设计

介绍Easv View触摸屏和西门子可编程控制器S7-200在二氧化氯发生控制器中的应用.简单阐述了控制器系统的构成、触摸屏界面与PLC软件的总体设计.着重讨论如何运用触摸屏和PLC加强人机对话的功能,实现PLC的可视化操作与控制.     

触摸屏与PLC在捻线机自动控制系统中的应用

针对传统捻线机必须技术改造问题,设计了基于触摸屏与可编程控制器(PLC)的自动控制系统.利用MT5000组态软件编制EView触摸屏的人机画面,通过触摸屏与西门子S7- 200 PLC的通信,并对PLC编程.完成对捻线机各项数据参数的设置和修改,从而达到纱线产品生产工艺过程的变换.该控制系统自动化程度高,人机界面直观易懂、操作方便,并具有实时监控性,提高了生产效率.     

PCC和HITECH触摸屏数据交换的研究

触摸屏通常可以与多种型号PLC通讯,用户在触摸屏软件中可以直接针对PLC的变量地址进行读写编程,但是触摸屏和PCC的通讯不像与PLC那样简单。针对此问题,该文介绍了如何通过Modbus通讯协议使HITECH触摸屏能监视和修改PCC的变量数据。该解决方案的提出不但解决了PCC和HITECH触摸屏配套时的数据通讯问题,同时也为PCC的用户提供了一种设计方法和编程思路。     

基于CC-Link的PLC控制电机变频调速系统的设计与实现

着重阐述由三菱公司生产的PLC、变频器和触摸屏组成的三相异步电动机调速系统的工作原理及实现方法。采用PLC、变频器和编码器组成的交流变频闭环反馈调速系统,此调速系统依靠三菱PLC、变频器和触摸屏三者之间的通讯实现数据共享,同时采用开放式现场总线——CC-Link网络实现远程监控,从而达到实时控制的目的。     

Assessing Ideational and Evaluative Skills and Creative Styles and Attitudes

This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style.     

Semantics and verification of monitors and systems of monitors and processes

In this paper we present a sound and complete semantics for the monitor concept of C.A.R. Hoare. First a method for specification of monitors, introduced by O.-J. Dahl, is reviewed. This method is based on the relation between the historic sequence of monitor procedure calls and the historic sequence of monitor procedure exits. Based on such specifications and our new monitor semantics we present a method by which it is possible to prove that a concrete monitor is an implementation of an abstract one. In the last part of the paper an axiomatic semantics for systems of concurrent processes and monitors is introduced. The method supports verification by separation of concerns: Properties of the communication to and from each process are proven in isolation by a usual Hoare style axiomatic semantics, while abstract monitors are also specified in isolation by the method reviewed in the first part of the paper. These properties of the components of the system are then used in a new proof rule to conclude properties of the complete system. Stein Gjessing received a Ph.D. (actually a Dr. philos.) from the University of Oslo (Norway) in 1985. Presently he is an Associate Professor at the Institute of informatics, University of Oslo, Norway. Dr. Gjessings research interests are in the area of concurrent and distributed programming, operating systems, formal specification and verification and programming languages.     

Integrating and automating analysis and optimization

The development of an interface coupling program on personal computers for an analysis software system such as ANSYS, SAP, etc. and an optimization software system, MOST, is presented. By controlling and directing the communications the interface coupler integrates the two programs while retaining their versatility and interactive features. The integrated system is used to solve a numerical example of active noise control for a three-dimensional enclosure, in which an energy density level of control points is minimized by adding the sound source to cancel the unwanted noise. The interface coupling program automates with relatively low cost the iterative process for designing an engineering system, remaining flexible in acoustical modelling and efficient in equation solving. Also, the coupling interface is developed in a general-purpose way so that it can be expanded easily to integrate more analysis software packages of different kinds.     

Rank and select revisited and extended

The deep connection between the Burrows–Wheeler transform (BWT) and the so-called rank and select data structures for symbol sequences is the basis of most successful approaches to compressed text indexing. Rank of a symbol at a given position equals the number of times the symbol appears in the corresponding prefix of the sequence. Select is the inverse, retrieving the positions of the symbol occurrences. It has been shown that improvements to rank/select algorithms, in combination with the BWT, turn into improved compressed text indexes.