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自从台plc出现以后，日本、德国、法国等也相继开始研制plc，并得到了迅速的发展。
目前，世界上有200多家plc厂商，400多品种的plc产品，按地域可分成美国、欧洲、和日本等三个流派产品，各流派plc产品都各具特色，如日本主要发展中小型plc，其小型plc性能，结构紧凑，价格便宜，在世界市场上占用重要地位。
的plc生产厂家主要有美国的a-b（allen-bradly）公司、ge（generalelectric）公司，日本的三菱电机（mitsubishielectric）公司、欧姆龙（omron）公司，德国的aeg公司、西门子（siemens）公司，法国的te（telemecanique）公司等。
我国的plc研制、生产和应用也发展很快，尤其在应用方面更为突出。在20世纪70年代末和80年代初，我国随国外成套设备、专用设备引进了不少国外的plc。此后，在传统设备改造和新设备设计中，plc的应用逐年增多，并取得显著的经济效益，plc在我国的应用越来越广泛，对提高我国工业自动化水平起到了巨大的作用。
目前，我国不少科研单位和工厂在研制和生产plc，如辽宁无线电二厂、无锡华光电子公司、上海香岛电机制造公司、厦门a-b公司等。
plc可编程序控制器：plc英文全称programmablelogiccontroller,中文全称为可编程逻辑控制器，定义是:一种数字运算操作的电子系统，专为在工业环境应用而设计的。它采用一类可编程的存储器，用于其内部存储程序，执行逻辑运算,顺序控制，定时，计数与算术操作等面向用户的指令，并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。dcs集散系统:dcs英文全称distributedcontrolsystem,中文全称为集散型控制系统。dcs可以解释为在模拟量回路控制较多的行业中广泛使用的，尽量将控制所造成的危险性分散,而将管理和显示功能集中的一种自动化高技术产品。dcs一般由五部份组成：1：控制器2：i/o板3：操作站4：通讯网络5：图形及遍程软件。
在工业生产过程中，大量的开关量顺序控制，它按照逻辑条件进行顺序动作，并按照逻辑关系进行连锁保护动作的控制，及大量离散量的数据采集。传统上，这些功能是通过气动或电气控制系统来实现的。1968年美国gm（通用汽车）公司提出取代继电气控制装置的要求，第二年，美国数字公司研制出了基于集成电路和电子技术的控制装置，首次采用程序化的手段应用于电气控制，这就是代可编程序控制器，称programmablecontroller（pc）。
个人计算机（简称pc）发展起来后，为了方便，也为了反映可编程控制器的功能特点，可编程序控制器定名为programmablelogiccontroller（plc），现在，仍常常将plc简称pc。
plc的定义有许多种。国际电工委员会（iec）对plc的定义是：可编程控制器是一种数字运算操作的电子系统，专为在工业环境下应用而设计。它采用可编程序的存贮器，用来在其内部存贮执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，并通过数字的、模拟的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关设备，都应按易于与工业控制系统形成一个整体，易于扩充其功能的原则设计。
上世纪80年代至90年代中期，是plc发展快的时期，年增长率一直保持为30~40%。在这时期，plc在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高，plc逐渐进入过程控制领域，在某些应用上取代了在过程控制领域处于统治地位的dcs系统。
plc具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。plc在工业自动化控制特别是顺序控制中的地位，在可预见的将来，是无法取代的。从结构上分，plc分为固定式和组合式（模块式）两种。固定式plc包括cpu板、i/o板、显示面板、内存块、电源等，这些元素组合成一个不可拆卸的整体。模块式plc包括cpu模块、i/o模块、内存、电源模块、底板或机架，这些模块可以按照一定规则组合配置。
cpu是plc的核心，起神经中枢的作用，每套plc至少有一个cpu，它按plc的系统程序赋予的功能接收并存贮用户程序和数据，用扫描的方式采集由现场输入装置送来的状态或数据，并存入规定的寄存器中，同时，诊断电源和plc内部电路的工作状态和编程过程中的语法错误等。进入运行后，从用户程序存贮器中逐条读取指令，经分析后再按指令规定的任务产生相应的控制信号，去指挥有关的控制电路。
cpu主要由运算器、控制器、寄存器及实现它们之间联系的数据、控制及状态总线构成，cpu单元还包括外围芯片、总线接口及有关电路。内存主要用于存储程序及数据，是plc不可缺少的组成单元。
在使用者看来，不必要详细分析cpu的内部电路，但对各部分的工作机制还是应有足够的理解。cpu的控制器控制cpu工作，由它读取指令、解释指令及执行指令。但工作节奏由震荡信号控制。运算器用于进行数字或逻辑运算，在控制器指挥下工作。寄存器参与运算，并存储运算的中间结果，它也是在控制器指挥下工作。
cpu速度和内存容量是plc的重要参数，它们决定着plc的工作速度，io数量及软件容量等，因此限制着控制规模。
plc与电气回路的接口，是通过输入输出部分（i/o）完成的。i/o模块集成了plc的i/o电路，其输入暂存器反映输入信号状态，输出点反映输出锁存器状态。输入模块将电信号变换成数字信号进入plc系统，输出模块相反。i/o分为开关量输入（di），开关量输出（do），模拟量输入（ai），模拟量输出（ao）等模块。
开关量是指只有开和关（或1和0）两种状态的信号，模拟量是指连续变化的量。常用的i/o分类如下：开关量：按电压水平分，有220vac、110vac、24vdc，按隔离方式分，有继电器隔离和晶体管隔离。模拟量：按信号类型分，有电流型（4-20ma,0-20ma）、电压型（0-10v,0-5v,-10-10v）等，按精度分，有12bit,14bit,16bit等除了上述通用io外，还有特殊io模块，如热电阻、热电偶、脉冲等模块。
按i/o点数确定模块规格及数量，i/o模块可多可少，但其大数受cpu所能管理的基本配置的能力，即受大的底板或机架槽数限制。 plc电源用于为plc各模块的集成电路提供工作电源。同时，有的还为输入电路提供24v的工作电源。电源输入类型有：交流电源（220vac或110vac），直流电源（常用的为24vdc）。 大多数模块式plc使用底板或机架，其作用是：电气上，实现各模块间的联系，使cpu能访问底板上的所有模块，机械上，实现各模块间的连接，使各模块构成一个整体。
编程设备：编程器是plc开发应用、监测运行、检查维护不可缺少的器件，用于编程、对系统作一些设定、监控plc及plc所控制的系统的工作状况，但它不直接参与现场控制运行。小编程器plc一般有手持型编程器，目前一般由计算机（运行编程软件）充当编程器。人机界面：简单的人机界面是指示灯和按钮，目前液晶屏（或触摸屏）式的一体式操作员终端应用越来越广泛，由计算机（运行组态软件）充当人机界面非常普及。输入输出设备：用于性地存储用户数据，如eprom、eeprom写入器、条码阅读器，输入模拟量的电位器，打印机等。
依靠的工业网络技术可以迅速有效地收集、传送生产和管理数据。因此，网络在自动化系统集成工程中的重要性越来越显著，甚至有人提出'网络就是控制器'的观点说法plc具有通信联网的功能，它使plc与plc之间、plc与上位计算机以及其他智能设备之间能够交换信息，形成一个统一的整体，实现分散集中控制。多数plc具有rs-232接口，还有一些内置有支持各自通信协议的接口。
plc的通信，还未实现互操作性，iec规定了多种现场总线标准，plc各厂家均有采用。对于一个自动化工程(特别是中大规模控制系统)来讲，选择网络非常重要的。首先，网络必须是开放的，以方便不同设备的集成及未来系统规模的扩展；其次，针对不同网络层次的传输性能要求，选择网络的形式，这必须在较深入地了解该网络标准的协议、机制的前提下进行；再次综合考虑系统成本、设备兼容性、现场环境适用性等具体问题，确定不同层次所使用的网络标准。
配电箱、柜的所有技术指标必须符合规范及设计要求。投标人应明确生产的产品执行的标准（国家标准gb7251、行业标准、企业标准），并根据所依据的标准提供相应的国标、行标或企标（企业标准应高于国标或行标）。
所有的电气元件及技术参数必须符合设计要求，如需更改必须按正规工程资料（洽商）表格的要求填写并经设计院、建设单位、监理、施工单位及厂方代表共同签字认可。否则由此产生的损失由供货单位负责。
根据本工程图纸选有代表性的暗装箱、明装箱、配电柜生产样品，完后通知建设单位、监理、施工单位有关人员验收通过后，方可全面生产。
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agilestar - ons-xc-10g-47-7 - for cisco - nib
agilestar - ons-xc-10g-46-9 - for cisco - nib
agilestar - ons-xc-10g-46-1 - for cisco - nib
agilestar - ons-xc-10g-45-3 - for cisco - nib
agilestar - ons-xc-10g-43-7 - for cisco - nib
agilestar - ons-xc-10g-42-9 - for cisco - nib
agilestar - ons-xc-10g-42-1 - for cisco - nib
agilestar - ons-xc-10g-41-3 - for cisco - nib
agilestar - ons-xc-10g-40-5 - for cisco - nib
agilestar - ons-xc-10g-39-7 - for cisco - nib
agilestar - ons-xc-10g-38-1 - for cisco - nib
agilestar - ons-xc-10g-37-4 - for cisco - nib
agilestar - ons-xc-10g-36-6 - for cisco - nib
agilestar - ons-xc-10g-35-8 - for cisco - nib
agilestar - ons-xc-10g-35-0 - for cisco - nib
agilestar - ons-xc-10g-34-2 - for cisco - nib
agilestar - ons-xc-10g-33-4 - for cisco - nib
agilestar - ons-xc-10g-32-6 - for cisco - nib
agilestar - ons-xc-10g-31-9 - for cisco - nib
agilestar - ons-xc-10g-30-3 - for cisco - nib
agilestar - ons-xc-10g-31-1 - for cisco - nib
agilestar - 10g-xnpk-lw-as - for foundry - new in box
agilestar - ons-xc-10g-38-9 - for cisco - nib
agilestar xenpak-10gb-lw - for cisco - new in box
agilestar - gp-xfp-w59 - for force 10 networks - nib
agilestar - gp-xfp-w47 - for force 10 networks - nib
agilestar - gp-xfp-w22 - for force 10 networks - nib
agilestar - gp-xfp-w23 - for force 10 networks - nib
agilestar - gp-xfp-w24 - for force 10 networks - nib
agilestar - gp-xfp-w26 - for force 10 networks - nib
agilestar - gp-xfp-w27 - for force 10 networks - nib
agilestar - gp-xfp-w28 - for force 10 networks - nib
agilestar - gp-xfp-w29 - for force 10 networks - nib
agilestar - gp-xfp-w31 - for force 10 networks - nib
agilestar - gp-xfp-w32 - for force 10 networks - nib
agilestar - gp-xfp-w33 - for force 10 networks - nib
agilestar - gp-xfp-w35 - for force 10 networks - nib
agilestar - gp-xfp-w36 - for force 10 networks - nib
agilestar - gp-xfp-w37 - for force 10 networks - nib
agilestar - gp-xfp-w39 - for force 10 networks - nib
agilestar - gp-xfp-w41 - for force 10 networks - nib
agilestar - gp-xfp-w42 - for force 10 networks - nib
agilestar - gp-xfp-w43 - for force 10 networks - nib
agilestar - gp-xfp-w46 - for force 10 networks - nib
agilestar - gp-xfp-w48 - for force 10 networks - nib
agilestar - gp-xfp-w49 - for force 10 networks - nib
agilestar - gp-xfp-w51 - for force 10 networks - nib
agilestar - gp-xfp-w54 - for force 10 networks - nib
agilestar - gp-xfp-w58 - for force 10 networks - nib
agilestar - gp-xfp-w21 - for force 10 networks - nib
agilestar - 10125 - for extreme networks - new in box
agilestar - as-x2-10g-zr - for agilestar - new in box
agilestar - as-xen-10g-zr - for agilestar - new in box
agilestar - oc192-xfp-lr2-a​s - for foundry - new in box
agilestar - ds-x2-fc10g-er - for cisco - nib
agilestar - 3he00410aa - for alcatel-lucent - nib
agilestar - fim82020 - for fujitsu - new in box
agilestar - ons-xc-10g-44-5 - for cisco - nib
agilestar - gp-xfp-w34-as - for force10 - new in box
agilestar - gp-xfp-w38-as - for force10 - new in box
agilestar - gp-xfp-w40-as - for force10 - new in box
agilestar - gp-xfp-w52-as - for force10 - new in box
agilestar - ons-sc-2g-42.9-​as - for cisco - new in box
agilestar - ons-sc-2g-49.3-​as - for cisco - new in box
agilestar - ons-sc-2g-28.7 - for cisco - new in box
agilestar - ons-sc-2g-30-3 - for cisco - new in box
agilestar - ons-sc-2g-31.1 - for cisco - new in box
agilestar - ons-sc-2g-31-9 - for cisco - new in box
agilestar - ons-sc-2g-32-6 - for cisco - new in box
agilestar - ons-sc-2g-33-4 - for cisco - new in box
agilestar - ons-sc-2g-34-2 - for cisco - new in box
agilestar - ons-sc-2g-35-0 - for cisco - new in box
agilestar - ons-sc-2g-35-8 - for cisco - new in box
agilestar - ons-sc-2g-36-6 - for cisco - new in box
agilestar - ons-sc-2g-38-1 - for cisco - new in box
agilestar - ons-sc-2g-38-9 - for cisco - new in box
agilestar - ons-sc-2g-39-7 - for cisco - new in box
agilestar - ons-sc-2g-40-5 - for cisco - new in box
agilestar - ons-sc-2g-41-3 - for cisco - new in box
agilestar - ons-sc-2g-42-1 - for cisco - new in box
agilestar - ons-sc-2g-43-7 - for cisco - new in box
agilestar - ons-sc-2g-44-5 - for cisco - new in box
agilestar - ons-sc-2g-46-1 - for cisco - new in box
agilestar - ons-sc-2g-46-9 - for cisco - new in box
agilestar - ons-sc-2g-47-7 - for cisco - new in box
agilestar - ons-sc-2g-48-5 - for cisco - new in box
agilestar - ons-sc-2g-50-1 - for cisco - new in box
agilestar - ons-sc-2g-50-9 - for cisco - new in box
agilestar - ons-sc-2g-51-7 - for cisco - new in box
agilestar - ons-sc-2g-52-5 - for cisco - new in box
agilestar - ons-sc-2g-54-9 - for cisco - new in box
agilestar - ons-sc-2g-55-7 - for cisco - new in box
agilestar - ons-sc-2g-56-5 - for cisco - new in box
agilestar - ons-sc-2g-57-3 - for cisco - new in box
agilestar - ons-sc-2g-58-1 - for cisco - new in box
agilestar - ons-sc-2g-58-9 - for cisco - new in box
agilestar - ons-sc-2g-59-7 - for cisco - new in box
agilestar - ons-sc-2g-60-6 - for cisco - new in box
agilestar - gp-xfp-1z - for force 10 networks - nib
agilestar - ons-sc-2g-54-1 - for cisco - new in box
agilestar - 10gbase-zr - for enterasys networks - nib
agilestar - fim81550 - for fujitsu - new in box
agilestar - j8176a - for hp - new in box
agilestar - smc10gxen-er - for smc - new in box
agilestar - as-xfp-10g-zr - for agilestar - new in box
agilestar - ds-x2-fc10g-lr - for cisco - nib
agilestar - fim31052/120-as - for fujitsu - new in box
agilestar - fim31052 - for fujitsu - new in box
agilestar - 10g-xfp-zr - for foundry networks - nib
agilestar - aa1403006-e5 - for nortel - new in box
agilestar - ftlx1841e2-as - for finisar - new in box
agilestar - xfp-10gzr-oc192​lr - for cisco - nib
agilestar - 10g-xnpk-zr - for foundry networks - nib
agilestar - ons-sc-z3-1470 - for cisco - new in box
agilestar - ons-sc-z3-1490 - for cisco - new in box
agilestar - ons-sc-z3-1510 - for cisco - new in box
agilestar - ons-sc-z3-1530 - for cisco - new in box
agilestar - ons-sc-z3-1550 - for cisco - new in box
agilestar - ons-sc-z3-1570 - for cisco - new in box
agilestar - ons-sc-z3-1590 - for cisco - new in box
agilestar - ons-sc-z3-1610 - for cisco - new in box
agilestar - sf2g-lx4-5c-47-​as - for fibrolan - new in b
agilestar - sf2g-lx4-5c-49-​as - for fibrolan - new in b
agilestar - sf2g-lx4-5c-51-​as - for fibrolan - new in b
agilestar - sf2g-lx4-5c-53-​as - for fibrolan - new in b
agilestar - sf2g-lx4-5c-55-​as - for fibrolan - new in b
agilestar - sf2g-lx4-5c-57-​as - for fibrolan - new in b
agilestar - sf2g-lx4-5c-59-​as - for fibrolan - new in b
agilestar - sf2g-lx4-5c-61-​as - for fibrolan - new in b
agilestar - 3he00047aa - for alcatel-lucent - nib
agilestar - ftrx-1811-3 - for finisar - new in box
agilestar - ons-se-2g-1470 - for cisco - new in box
agilestar - ons-se-2g-1490 - for cisco - new in box
agilestar - ons-se-2g-1510 - for cisco - new in box
agilestar - ons-se-2g-1530 - for cisco - new in box
agilestar - ons-se-2g-1550 - for cisco - new in box
agilestar - ons-se-2g-1570 - for cisco - new in box
agilestar - ons-se-2g-1590 - for cisco - new in box
agilestar - ons-se-2g-1610 - for cisco - new in box
agilestar - dwdm-xenpak-36.​61 -for cisco - new in box
agilestar - dwdm-x2-30.33 - for cisco -10gbase-dwdm
agilestar - dwdm-x2-31.12 - for cisco -10gbase-dwdm
agilestar - dwdm-x2-31.90 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-32.68 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-34.25 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-35.04 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-35.82 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-36.61 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-38.19 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-38.98 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-39.77 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-40.56 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-42.14 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-42.94 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-43.73 - for cisco -10gbase-dwdm
agilestar - dwdm-x2-44.53 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-46.12 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-46.92 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-47.72 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-48.51- for cisco - 10gbase-dwdm
agilestar - dwdm-x2-50.12 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-50.92 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-51.72 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-52.52 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-54.13 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-54.94 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-55.75 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-56.55 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-58.17 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-58.98 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-59.79 - for cisco - 10gbase-dwdm
agilestar - dwdm-x2-60.61 - for cisco - 10gbase-dwdm
agilestar - dwdm-xenpak-30.​33 - for cisco - new in box
agilestar - dwdm-xenpak-31.​12 - for cisco - new in box
agilestar - dwdm-xenpak-31.​90 - for cisco - new in box
agilestar - dwdm-xenpak-32.​68 - for cisco - new in box
agilestar - dwdm-xenpak-34.​25 - for cisco - new in box
agilestar - dwdm-xenpak-35.​04 - for cisco - new in box
agilestar - dwdm-xenpak-35.​82 - for cisco - new in box
agilestar - dwdm-xenpak-38.​19 - for cisco - new in box
agilestar - dwdm-xenpak-38.​98 - for cisco - new in box
agilestar - dwdm-xenpak-39.​77 - for cisco - new in box
agilestar - dwdm-xenpak-40.​56 - for cisco - new in box
agilestar - dwdm-xenpak-42.​14 - for cisco - new in box
agilestar - dwdm-xenpak-42.​94 - for cisco - new in box
agilestar - dwdm-xenpak-43.​73 - for cisco - new in box
agilestar - dwdm-xenpak-44.​53 - for cisco - new in box
agilestar - dwdm-xenpak-46.​12 - for cisco - new in box
agilestar - dwdm-xenpak-46.​92 - for cisco - new in box
agilestar - dwdm-xenpak-47.​72 - for cisco - new in box
agilestar - dwdm-xenpak-48.​51 - for cisco - new in box
agilestar - dwdm-xenpak-50.​12 - for cisco - new in box
agilestar - dwdm-xenpak-50.​92 - for cisco - new in box
agilestar - dwdm-xenpak-51.​72 - for cisco - new in box
agilestar - dwdm-xenpak-52.​52 - for cisco - new in box
agilestar - dwdm-xenpak-54.​13 - for cisco - new in box
agilestar - dwdm-xenpak-54.​94 - for cisco - new in box
agilestar - dwdm-xenpak-55.​75 - for cisco - new in box
agilestar - dwdm-xenpak-56.​55 - for cisco - new in box
agilestar - dwdm-xenpak-58.​17 - for cisco - new in box
agilestar - dwdm-xenpak-58.​98 - for cisco - new in box
agilestar - dwdm-xenpak-59.​79 - for cisco - new in box
agilestar - dwdm-xenpak-60.​61 - for cisco - new in box
agilestar - 10gbase-zr-xfp - enterasys networks - nib
agilestar - ex-xfp-10ge-zr - juniper - new in box
agilestar - e1mg-bxd-60km-a​s - for foundry - new in box
agilestar - e1mg-bxu-60km-a​s - for foundry - new in box
agilestar - xenpak-1xge-zr - juniper - new in box
agilestar - su69cd-as - for marconi - xfp 10gbase-zr sm
agilestar - pan-xfp-zr - for palo alto - new in box
agilestar - xfp-10gzr-oc192​lr2 - for cisco - nib
agilestar - ftlx1811m3 - for finisar - new in box
agilestar - xfp-10g-zr80 - for alcatel-lucent - nib
agilestar - x2-10gb-zr - for cisco - new in box
agilestar - dwdm-xfp-30.33 - for cisco - new in box
agilestar - dwdm-xfp-32.68 - for cisco - new in box
agilestar - dwdm-xfp-35.04 - for cisco - new in box

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