ABB机器人的主要型号有哪些以及对应的应用领域?
"我们也看到了用户对控制系统数据的无限热情,用户可以收集安全、财务、质保程序等方面的信息,"罗克韦尔自动化Ken Deken认为,"为满足用户的这个要求,用户需要控制器和业务系统之间的直接联系,任何时候都能提供信息。" 随着不断的发展,PAC将采用大量的方法以处理数据,并具有升级性,而在多项目控制、集成商务系统分析和生命周期成本管理等方面也能大踏步地前进。 控制系统与计算机控制系统的比较: 性能指标计算机控制系统PLC控制系统 可靠性商业级工业级 工作方式中断方式,程序等待条件满足扫描方式,条件不满足程序继续执行 编程语言汇编语言、编程语言标准编程语言 工作环境要求较高对环境要求不高,适应工业现场环境要求 使用者技能要求需专门培训编程语言容易掌握,且有多种编程语言 系统软件功能强,且占用存储空间大功能专用,占用存储空间小 适应领域家庭、办公室、管理层、科学计算专门用于工业过程控制 价格高较低 PLC控制系统与分散控制系统的比较: 分散控制系统是专门为工业过程控制设计的过程仪表控制系统,也称为集散控制系统。按照可编程控制器的发展历程和DCS发展历程的分析,分散控制系统的主要应用场合是连续量的模拟控制,而可编程控制器的主要场合是开关量的逻辑控制。因此在设计思想上有一定的区别。 在工厂自动化或计算机集成过程控制系统中,为了分散危险和分散功能,采用分散综合的控制系统结构。可编程控制器是分散的自治控制系统,它可以作为下位机完成分散的控制功能,与直接数字计算机的集中控制比较有质的飞跃。这种递阶控制系统也是分散控制系统的基础。 可编程控制器按扫描方式工作,分散控制系统按用户程序的指令工作。因此,可编程控制器对每个采样点的采样速度是相同的,而分散控制系统中,可根据被检测对象的特性采用不同的采样速度,例如,流量点的采样速度是1S,温度点的采样速度是20S等。此外,在分散控制系统中,可以设置多级中断优先级,而可编程控制器通常不设置中断方式。 存储器容量上,可编程控制器所需运算大多是逻辑运算,因此,所需存储器容量较小,而分散控制系统需进行大量数字运算,存储器容量大。运算速度方面,模拟量运算速度可以较慢,而开关量运算需要较快的速度。抗干扰和运算精度方面,两者也有所不同,例如,开关量的抗干扰性较模拟量的的抗干扰要强,模拟量的运算精度要求较高等。 分散控制系统的分散过程控制装置安装在现场,除需按现场的工作环境设计外,分散控制系统的装置通常根据安装在控制室的要求设计。可编程控制器是按照工作环境的要求设计,因此在元器件的可靠性方面需有专门的考虑,对环境的适应性也需专门考虑,以适应恶劣工作环境的需要。 随着应用范围的扩展,可编程控制器和分散控制系统、现场总线控制系统、数据采集和监控系统相互渗透,互相补充。例如,可编程控制器扩展模拟量控制的功能,分散控制系统扩展开关量控制的功能等,出现你中有我,我中有你的综合集成趋势。 基于PLC的特点,PLC已得到广泛的应用。目前主要是: 1.用于顺序控制 顺序控制是根据有关输入开关量的当前与历史的状况,产生所要求的开关量输出,以使系统能按一定顺序工作。这是系统工作基本的控制。也是离散生产过程常用的控制。 常用的顺序控制有: 随机控制,根据随机出现的条件实施控制; 动作控制,根据动作完成的情况实施控制; 时间控制,根据时间推进的进程实施控制; 计数控制,根据累计计数的情况实施控制; 混合控制,包含有以上几种控制的组合; 还有不同以上的其它控制,等等。 使用PLC实现顺序控制是PLC的初衷,也是它的强项。在顺序控制领域,至今还没有别的控制器能够取代它。 2.用于过程控制 过程控制要用到模拟量。模拟量一般是指连续变化的量,如电流、电压、温度、压力等物理量。过程控制的目的就是,根据有关模拟量的当前与历史的输入状况,产生所要求的开关量、或模拟量输出,以使系统工作参数能按一定要求工作。是连续生产过程常用的控制。 过程控制的类型很多。 PLC用于过程控制,已是一个趋势。因为用PLC实现这个控制,其价格比用别的要低,而且,用它时,在进行模拟量控制的同时,还可很方便的进行其它控制。再加上各种过程控制模块的开发与应用,以及相关软件的推出及使用,用PLC进行种种过程控制已变得很容易,其编程也很简便。所以,目前有的厂家PLC用于模拟量控制的份额,已超过用于顺序控制。 3.用于运动控制 运动控制主要指,对工作对象的位置、速度及加速度所作的控制。可以是单坐标,即控制对象作直线运动;也可是多坐标的,控制对象的平面、立体,以至于角度变换等运动。有时,还可控制多个对象,而这些对象间的运动可能还要有协调。 上个世纪50年代诞生于美国的数控技术,简称数控(NC),就是基于电子计算机及这个脉冲量的应用而不断发展与完善的运动控制技术。而今,已发展到完善的境地,已是成为当今自动化技术的一个重要支柱。 PLC也已具备处理脉冲量的能力。PLC有脉冲信号输入点或模块,可接收脉冲量输入(PI)。PLC有脉冲信号输出点或模块,可输出脉冲量(PO)。有了处理PI/PO这两种功能,加上PLC已有数据处理及运算能力,完全可以依NC的原理进行运动控制。 用PLC实现这个控制,其价格比用NC要低得多。而且,它在进行运动控制的同时,还可进行其它控制。再加上PLC各种运动控制模块的开发与应用,以及相关软件的推出及使用,用PLC进行种种运动控制已变得很容易,其编程也可使用NC语言,很简便。 近年,还出现了专门用于运动控制的PLC,即P(PROGRAMMABLE)M(MOTION)C(CONTROLLER),可编程运动控制器,简称PMC。又为PLC用于精度更高、运动行程更大、控制的坐标更多、操作更方便的运动控制提供了很好的平台。所以,用PLC进行运动控制,在相当程度上,可以代替价格比其昂贵的数控系统。 4.用于信息控制 信息控制也称数据处理,是指数据采集、存储、检索、变换、传输及数表处理等。 随着技术的发展,PLC不仅可用作系统的工作控制,还可用作系统的信息控制。 PLC用于信息控制有两种:专用、兼用。 专用:PLC只用作采集、处理、存贮及传送数据。 兼用:在PLC实施控制的同时,也可实施信息控制。 PLC用作信息控制,或兼做信息控制,既是PLC应用的一个重要方面,又是信息化的基础。 5.用于远程控制 远程控制是指,对系统的远程部分的行为及其效果实施检测与控制。PLC有多种通讯接口,有很强的联网、通讯能力,并不断有新的联网的模块与结构推出。所以,PLC远程控制是很方便的。 PLC与PLC可组成控制网。可通讯,交换数据,相互操作。参与通讯的PLC可多达几十、几百个。网与网还可互联。这样,参与通讯的PLC则更多,以至于不受限制。 PLC与智能传感器、智能执行装置(如变频器),也可联成设备网。也可通讯,交换数据,相互操作。可联接成远程控制系统,系统范围面可大到几十、几百公里或更大。这种远程控制,既提高了控制能力,又简化了硬件接线及维护。 PLC与可编程终端也可联网、通讯。PLC的数据可在它上面显示,也可通过它向PLC写数据,使它成为人们操作PLC的界面。 PLC可与计算机通讯,加进信息网。利用计算机具有强大的信息处理及信息显示功能,可实现计算机对控制系统的监控与数据采集SCADA(Supervisory Control and Data Acquisition)。同时,还可用计算机进行PLC编程、监控及管理。 PLC还有以太网模块,可用其使PLC加入互联网。也可设置自己的网址与网页。有这样PLC控制的工厂,有的称之为透明工厂(Transparent Factory)。在地球上任何可上网的计算机,只要权限允许,就可直接对其进行访问。 Juniper PE-2OC3-ATM-SMIR 2 PORT PIC Juniper SSB-E-M20-U w/ 1-Year Warranty Juniper FANTRAY-M7i M7i Fan Tray FANTRAY-M7i-S JUNIPER NETWORKS PE-1GE-LH 1PORT LH OPTICS REFURBISHED Juniper PE-1OC12-SON-SMIR module, 1 YEAR Warranty Juniper Networks PE-4FE-TX 4-port Fast Ethernet PIC Juniper PE-1GE-SX-B 1Port SX PIC M5 M7i M10 M10i Router 90 Day Warranty - Free Overnight Shipping! 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