如何选用PC机工控接口

随着国民经济的不断发展,实现工业生产过程微机控制的要求与日俱增。目前,由于PC机价格的飞速下降,使得应用微机进行工业生产过程控制的项目不断增加,而工控接口是联结微机与生产现场的必不可少的硬件接口设备。 在工控项目中,经常需要处理的物理量信号有模拟量、开关量和脉冲量,因此,相应的计算机接口包括模拟量输入/输出接口、开关量输入/输出接口和脉冲量输入/输出接口。模拟量输入/输出接口有     

基于Modbus协议的多功能数据采集器设计

设计了以AVRmega128单片机为控制核心,采用Modbus协议,用于变电站环境综合监控系统的多功能数据采集器;该数据采集器具有8路模拟量信号输入,16路开关量信号输入,4路开关量信号输出,上行和下行RS一485或RS一232通信接口;此多功能数据采集器适用于多种传感器输入方式,接口数量丰富,以Modbus协议为统一通信规约,可设定定时采集,具有掉电数据保护功能;该设计有效地降低了管理和部署的成本,提高了经济效益;经过半年的现场测试,该多功能数据采集器在接入6路模拟量传感器、10路开关量传感器的情况下,收发数据正常,整体运行稳定,能胜任相关环境的监控需求。     

“工业控制微型计算机应用技术” 讲座第二讲 现场输入信号的变换及处理

一、输入信号的处理技术 1.现场常用信号的种类在过程控制系统中,现场输入信号有模拟量输入,一般来自热电偶、热电阻、电子秤、变送器(0～10mA);开关量(数字量)输入;脉冲量输入;现场中断信号输入以及频率量输入等类型.     

PLC在自动翻板机控制系统中的应用

结合自动翻板机的设计,说明了在工业生产中,如何用PLC实现自动翻板机的自动控制。PLC通过开关量信号来决定各机械部分的运动状态;通过模拟量信号来控制和调节液压系统的压力和温度等参数;提供触摸屏等人机交互界面,方便操作人员的使用,配合了控制参数的输入以及在线监测等方面的要求。实际应用表明,PLC实现自动控制,具有设计简单、调试方便、易于维护等诸多优点,具有很高的实用价值。     

基于CPCI总线的光隔调理模块设计

介绍基于CPCI总线的抗恶劣环境计算机系统中光隔离调理模块的设计及实现,通过对输入模拟量进行差分接收、信号转换、隔离放大、有源滤波,最终输出为满足设备需求的电压信号。该设计在实际应用过程中得到了可靠性、稳定性等方面的验证。     

PLC控制器对压力信号的数据处理

以OMRON公司的C200H系列PLC为例,介绍了其模拟量单元内部电路和模拟量输入范围及其对应的数字量;并针对具体的应用环境详细讨论模拟量输入通道设置、输入信号范围设置,模拟量到数字量转换的过程及其部分程序;针对特定压力测试设备,找出了不同压力信号对应的模拟量电压值和十六进制数。     

让机器人在你手中诞生(下)

五、控制板及传感器说明⑴控制板结构:控制板主要结构如图29所示,包括1个电池接口、2个电机接口、8个模拟量接入口、4个开关量输入口、4个开关量输出口、1个充电器接口、1个串行通讯口和3个拨码开关。控制板安装时应将串行口一端与机器人的前向一致(机器人电机安装一侧可视为机器人后部)。图29功能:模拟量接入口:接口的中间为信号线,两侧为电源线(5VDC)。传感器信号需要接上拉电阻并由拨码开关3控制,拨码开关3的某一位为ON时对应的模拟量信号接3K的上拉电阻。开关量输入口:控制板的右下角为数字量输入端口1、2、3、4。用户可以将开关量传…     

用CPLD实现本安型矿用数据采集系统

实现了基于CPLD的本安型矿用数据采集系统.系统利用CPLD可编程逻辑器件的模块化设计思想,结合矿用设备信号处理本安型的行业要求,使用CPLD可编程逻辑器件完成了开关量信号输入、输出和频率模拟量输入工作.由于设计中可进行逻辑仿真,从而保证了设计的正确性,缩短了产品开发周期,简化了硬件设计,为产品赢得市场争取了时间.     

多路数据采集系统的设计

采用MSP430F149单片机作为控制器的核心器件,设计了一种通用的多路数据采集系统,可以通过USB接口对数据进行快速传输.该采集系统是由传感器、信号调理、数据采集硬件、通用计算机、软件等要素构成.为了满足系统要求,硬件采用模块化、开放性设计,由软件来配置、控制.它具有8通道模拟量输入、8通道开关量输入/输出、日历时间等功能.整个系统由微处理器、日历时钟芯片、增益放大器、中文液晶显示、大容量存储器、USB等器件组成.     

一种基于合并单元开关量采集的设计与实现

针对智能变电站中合并单元的集约化设计的需求,在4U半宽的模拟量输入的合并单元开发中,开关量信号的采集及数据处理用一个插件实现。该插件采用光隔等元器件组成的硬件采集回路将采集DC220和DC110直流信号转换成TTL电平,通过FPGA将开关量信号进行组帧处理,按照串口通讯协议以差分信号的方式上送给CPU,CPU解析串口报文,做相关功能的处理。给出了硬件设计和软件设计,详细介绍了软件通讯协议,并给出了串口数据波形。     

Robust Leader-Following Output Regulation of Uncertain Multi-Agent Systems With Time-Varying Delay

In this paper, the robust analysis and design of leader-following output regulation for multi-agent systems described by general linear models is given in presence of timevarying delay and model uncertainty. To this aim, a new regulation protocol for the closed-loop multi-agent system under a directed graph is proposed. An important specification of the proposed protocol is to guarantee the leader-following output regulation for uncertain multi-agent systems with both stable and unstable agents. Since many signals can be approximated by a combination of the stationary and ramp signals, the presented results work for adequate variety of the leaders. The analysis and design conditions are presented in terms of certain matrix inequalities. The method proposed can be used for both stationary and ramp leaders. Simulation results are presented to show the effectiveness of the proposed method.      

A general formulation and solvability of the global robust output regulation problem

While the output regulation problem for linear systems accommodates both bounded and unbounded exogenous signals, the existing formulation of the output regulation problem for nonlinear systems only allows bounded exogenous signals produced by an exosystem with a neutrally stable equilibrium. In particular, when it comes to the robust output regulation problem, the only admissible exogenous signal is a finite combination of step and sinusoidal functions. In this paper, we give a general formulation of the robust output regulation problem that admits unbounded exogenous signals, and contains the previous formulations as special cases when the system is linear or when the exogenous signals are bounded. Then, we give conditions under which the problem can be solved by solving a robust stabilization problem of an augmented system. Finally, we apply our general result to obtain the solvability conditions of the general robust output regulation problem for the class of lower triangular nonlinear systems.     

A Simple Robust Controller for the Approximate Regulation of Almost Periodic Signals for Linear Systems

By using a delay line as a signal generator, we design a simple robust controller for the approximate regulation (i.e., approximate asymptotic tracking and rejection) of almost periodic signals for linear systems. As opposed to the related existing results, our controller design does not require online parameter tuning. Besides the usual assumptions about stabilizability, detectability, and nonexistence of transmission zeros for the plant, the controller design algorithm of this paper only requires knowledge of the desired tracking accuracy . Based on this information alone, we can only design a robust controller achieving, in the presence of unknown trigonometric polynomial disturbances and additive perturbations to the plant and the controller, . Here, is the output of the plant and is an arbitrary almost periodic reference signal taken from an infinite-dimensional generalized Sobolev space of almost periodic functions. In this paper, we also study robust output regulation in the limiting case where . It turns out that, due to the general loss of exponential closed loop stability, asymptotic tracking/rejection can also be lost as , unless the exogenous signals are smooth enough. This last result extends some recent theorems on (nonrobust) open loop output regulation for infinite-dimensional exosystems. The results of this paper are new and potentially useful for finite-dimensional plants, but the main results are also true for infinite-dimensional systems with bounded control and observation operators.     

具有 iISS 逆动态的非线性系统的输出反馈调节

研究了具有积分输入状态稳定 (Integral input-to-state stability, iISS)逆动态和未知控制方向的更一般的非线性系统的输出反馈调节问题. 利用自适应反推的方法, 所设计的输出反馈控制器使得闭环系统的输出调节到原点, 并且闭环系统的其他信号有界.     

建模,模型库,优化与计算机辅助设计

本文根据CAD系统发展的要求,从计算机如何辅助产品设计出发,论述了建模的重要性,讨论了模型库概念、意义、发展前景以及与优化设计的关系,提出了与此有关的一些值得深入研究的问题。     

LabVIEW与VC程序的动态数据交换

通过在LabVIEW和VC程序之间建立DDE连接,实现了两种语言之间的双向数据交换,并提出了利用LabVIEW的TCP VI和MFC的Csocket类进行程序开发的方法和具体实现。该方法编程简单、通用性强,在用VC开发测控程序时可以充分利用LabVIEW提供的信号处理工具包,简化VC编程,提高程序的开发效率。     

The design of servomechanism controllers for uncertain plants and input signals

This paper summarizes a methodology for the design of servomechanism controllers for multivariate plants and reference/disturbance signals which may be uncertain or weakly non-linear. This framework represents a departure from the idealized tracking/disturbance rejection problem in the direction of realistic design considerations. The objective becomes ‘good’, though not exact, error regulation for applied signals which may be unknown or random in nature.     

Internal model approach to cooperative robust output regulation for linear uncertain time‐delay multiagent systems

In this paper, we study the cooperative robust output regulation problem for linear uncertain multiagent systems with both communication delay and input delay by the distributed internal model approach. The problem includes the leader‐following consensus problem of linear multiagent systems with time delay as a special case. We first generalize the internal model design method to systems with both communication delay and input delay. Then, under a set of standard assumptions, we have obtained the solution to the problem via both the state feedback control law and the output feedback control law. In contrast to the existing results, our results apply to general linear uncertain multiagent systems, accommodate a large class of leader signals, and achieve asymptotic tracking and disturbance rejection at the same time.     

中文HYTELNET的设计与实现

网络资源的查询是网络应用的重要课题之一。介绍限基于Ｗｉｎｓｏｃｋ平台下中文Ｈｙｅｌｎｅｔ网络资源查询系统的设计与实现，并就Ｈｙｔｅｌｎｅｔ数据文件的链接，Ｗｉｎｓｏｃｋ环境下软件的一般方法和Ｔｅｌｎｅｔ协议中选项协商，虚拟终端等的实现进行了阐述。     

Global Robust Output Regulation for a Class of Switched Nonlinear Systems with Nonlinear Exosystems

The problem of global robust output regulation for a class of switched nonlinear systems with nonlinear exosystems is investigated in this paper where not all subsystems are stabilizable. First, as an extension of the concept of non‐switched internal model, this paper defines a switched internal model, which together with the plant is called the switched augmented system. Also, we show that the problem of output regulation for the switched nonlinear system can be converted into a global robust regulation problem of the switched augmented system. Second, based on the average dwell time method, the global robust regulation problem under a class of switching signals with average dwell time is solved, which leads to the solution of the problem of global robust output regulation. Finally, an example is provided to demonstrate the effectiveness of the proposed design approach.