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431ME是一种综合性的通用型汽车电控系统检测设备,由431ME主机、各种测试接头、辅助测试线、测试卡和传感器模拟/测试仪等五部分组成.431ME主机采用ATMEL89C52 FLASH单片机作为核心控制芯片,内有8K的程序存储器,驻留着系统基本监控程序,监控程序控制着主机的工作模式(编程模式和测试模式). 相似文献
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在测量及测试应用系统中,为使现场采集的数据在突发性的掉电过程中不被丢失,且能长时间的保持,可采用32M位闪存芯片KM29N32000TS作为存储器。本文以AT89S51单片机为例介绍它在单片机系统中的硬件连接和软件编程方法。 相似文献
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介绍了基于Vx Works系统的多个快速以太网PCI控制器驱动的编程方法,给出了硬件框图和程序流程图,并说明了该驱动与上层程序的接口。 相似文献
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在S7—200 PLC中,创建密码的作用是限制用户与PLC联机时对某些特定的CPU功能的使用及存储器的存取。实现对应用程序的密码保护,是使用STEP7-Micro/WIN集成编程控制软件来创建及修改的。它分为三个保护等级,其中等级1为缺省保护等级,不需要密码,亦没有任何限制。表1即列出了各种功能的保护级别和保护情况。 相似文献
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大庆炼化公司180万吨/年ARGG装置备用风机的防喘振控制采用美国TRICONEX公司的TS3000系统,编程软件为MSW311。本文将防喘振控制的程序移到HONEYWELL公司TPS系统中,用TPS系统中的RV、RC、Logic及CL程序等完整的建立一套防喘振控制方案,并用Display Builder实现防喘振曲线图。 相似文献
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文章详细介绍了随机数的概念、ActionScript3.0随机函数范围的扩展以及函数值取整的方法,并进一步阐述了ActionScript3.0随机函数在Flash游戏编程中的具体应用。 相似文献
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Henry T. Kohlbrand 《Process Safety Progress》1991,10(1):52-54
A deflagration occurred in a pilot scale vessel containing an oxygen atmosphere and an organic solvent well below the flash point. This was unexpected since the experiment had been carried out on a smaller scale over 50 times. Further investigation of the incident showed that the loading of the vessel and agitation system produced a flammable mist which was capable of explosion at temperatures below the flash point. Simulation studies of the mist conditions in a controlled flammability system were also conducted. Ignition sources were also investigated and at least two were shown to be feasible. 相似文献
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为保证印刷电路板组件(printed circuit board assembly,PCBA)的功能性完备,在装壳前需对其进行功能测试,而当前生产线主要由人工测试分拣,效率低下,为此,设计了一种能够自动扫码、测试、分拣的自动控制系统。选用西门子S7-1200PLC作为控制器,WinCC组态软件作为上位监控系统,PLC与WinCC之间采用OPC的方式实现通信,采用VBS编程调用MSComm控件实现WinCC与测试工装和扫码枪之间的串口通信。测试结果表明,系统运行稳定,具有很好的实用性、可靠性。系统的使用能减少人力的投入,降低操作人员的劳动强度,提高生产效率,可在PCBA模块生产线中广泛使用。 相似文献
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《International Journal of Production Economics》2005,93(2):136-142
A distribution routing problem with time constraint is one of the important problems in distribution and supply center management. This research is concerned with an integrated distribution routing problem for multi-supply centers based on improved genetic algorithm and graphical user interface (GUI)-type programming. In this research, we proposed a method based on a three-step approach: in step 1 a sector clustering model is developed to transfer the multi-supply center problem to single supply center problems which are easier to be solved; in step 2 we developed a vehicle routing model with time constraints and in step 3 we developed a GA-TSP model which can improve the vehicle routing schedules. The objective of the problem is to minimize the logistic cost for a set of customers without being tardy or exceeding the capacity or travel time of the vehicles. For computational purpose, we developed a GUI-type computer program according to the proposed methods and the sample outputs show that the proposed method is very effective on a set of standard test problems, and it could be potentially useful in solving the distribution routing problems. 相似文献
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为了解决传统实验实践教学环节中的实验资源紧缺、实验设备维护成本高以及存在安全隐患等问题,设计了一种虚实结合的实验教学平台。首先以实际实验教学设备为基础,应用虚拟仿真技术,搭建具有与实物设备同样功能、属性的虚拟教学设备的机械结构及检测装置,其次通过连接物理PLC控制实验教学系统接口及编程环境,最后实现了虚拟教学设备与现实控制系统的结合。设计结果表明,平台较大程度地提高了实验设备机械执行部分在编程控制教学过程中的可验证性、容错能力及安全性,降低了实验设备采购及维护成本,提供了系统的VR仿真的运行环境,学生获得了真实的实验教学体验。所设计的机电系统虚实结合实验教学平台可应用在高校机械相关专业的实验与实训课程中,所利用的虚拟建模技术可为建立虚拟工厂和虚拟实验平台提供参考。 相似文献
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Lu Chen André Langevin Diane Riopel 《International Journal of Production Economics》2011,129(1):147-156
Relocation of items in a warehousing system is usually used when the handling machines become the bottleneck. This paper addresses the optimization problem of relocation in a warehouse with dynamic operating policy. An integer linear programming formulation is proposed. A two-stage heuristic method is developed to generate an initial solution. A tabu search algorithm is proposed to improve the solution. Two relocation policies are studied and their performances are compared. 相似文献