HONEYWELL 51304754-100

HONEYWELL 51304754-100   件件 

HONEYWELL 51304754-100   件件 

HONEYWELL 51304754-100   件件 

PLC控制和DCS控制系统不是一个逻辑层次上的概念,从名称上就能看出:PLC是以功能命名,DCS是以体系结构命名。从原理上看PLC就可以组成DCS。当然两者性能差异还是存在的,要具体看产品和需要。从应用角度来说,简单地以PLC,DCS来区分,往往会走人误区。

　　DCS控制系统与PLC控制区别:DCS是一种“分散式控制系统”,而PLC(可编程控制器)只是一种控制“装置”,两者是“系统”与“装置”的区别。系统可以实现任何装置的功能与协调,PLC装置只实现本单元所具备的功能。

　　DCS网络是整个系统的中枢神经,DCS系统通常采用的国际标准协议TCP/IP。它是可靠双冗余的高速通讯网络,系统的拓展性与开放性.而PLC因为基本上都为单个小系统工作,在与别的PLC或上位机进行通讯时,所采用的网络形式基本都是单网结构,网络协议也经常与国际标准不符。在网络上PLC没有很好的保护措施。

　　DCS整体考虑方案,操作员站都具备工程师站功能,站与站之间在运行方案程序下装后是一种紧密联合的关系,任何站、任何功能、任何被控装置间都是相互连锁控制,协调控制;而单用PLC互相连接构成的系统,其站与站(PLC与PLC)之间的联系则是一种松散连接方式,做不出协调控制的功能。

　　DCS在整个设计上就留有大量的可扩展性接口,外接系统或扩展系统都十分方便,PLC所搭接的整个系统完成后,想随意的增加或减少操作员站都是很难实现的。

　　为保证DCS控制的设备的可靠,DCS采用了双冗余的控制单元,当重要控制单元出现故障时,都会有相关的冗余单元实时无扰的切换为工作单元,保证整个系统的可靠。PLC所搭接的系统则需要配置双PLC实现冗余。

　　对各种工艺控制方案更新是DCS的一项基本的功能,当某个方案发生变化后,工程师只需要在工程师站长将更改过的方案编译后,执行下装命令就可以了,下装过程是由系统白动完成的,不影响原控制方案运行。系统各种控制软件与算法可以将工艺对象的控制精度提高。

　　而对于PLC构成的系统来说,工作量极其庞大,首先需要确定所要编辑更新的是哪个PLC,然后要用与之对应的编译器进行程序编译,后再用的机器(读写器)一对一的将程序传送给这个PLC,在系统调试期间,大量增加调试时间和调试成本,而且极不利于日后的维护。

　　在控制精度上相差甚远。这就决定了为什么在大中型控制项目中(500点以上),基本不采用全部由PLC所连接而成的系统的原因DCS系统所有I/O模块都带有CPU,可以实现对采集及输出信号品质判断与标量变换,故障带电拔,随机更换。而PLC模块只是简单电气转换元,没有智能芯片,故障后相应单元全部瘫痪。

Spectrum 260-00698 Circuit Board FRU-600-90072 Nikon NSR-S205C NSR-S307E works

Spectrum 260-00651 Circuit Board FRU-600-90051 Nikon NSR-S205C NSR-S307E works

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Hitachi S-9300 Etcher 560-5502 NOMAFC working

Hitachi S-9300 Etcher 568-5502 568-5503 560-5512 IMSUB Circuit Board working

Hitachi S-9300 Etcher 568-5591 568-5506 SIPMAIN2 Circuit working

Hitachi S-9300 Etcher 560-5506 NE-Q Circuit Board working

PG104L-04 Mycom Circuit Board MY5211-047A M4COM DNS Screen FC-3000

JDF005 SL-1011 Screen Circuit Board HLS-VME2 PC-97002A DNS Screen FC-3000

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Nikon OpitStation 3A Wafer Handler Module Assembly Used Working

Nikon 3A OptiStation Used Working

Nikon NSR SEA141A 4S587-624 AVIS1 ERG AMP 4S013-374-2 Rev ABCD used working

Nikon Circuit Board 4S018-885 CPCI-IF NSR-S307E Nikon Control Rack Sub Alignment

Nikon Motorola Circuit Board 4S082-992-1 MCP750 Nikon NSR-S307E Control Rack

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Nikon Circuit Board 4S013-497 DSP-INF NSR-S307E Nikon Control Rack working

Edwards B90002051 Gate Valve ISO 160 New Surplus

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Hitachi 569-5555 Circuit Board NEVAC Hitachi S-9380 Main Body used working

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ASML 4022 471 5745 Power Drive Circuit Board

Agilent 4022 471 5701 Power Control Circuit Board ASML

ASML 4022 471 8128 Circuit Board

ASML 4022 471 5027 Circuit Board

ASML 4022 471 63192 Circuit Board

Motorola 4022 470 6469 MVME 2431 Circuit Board ASML

ASML 4022 471 6363 Power Drive Circuit Board

Blue Wave Systems DV44-50 Circuit Board 4022 471 6181

ASML 4022 471 4042 Circuit Board

ASML 4022 471 4684 Circuit Board

Sun Microsystems 602-3146-01 SunFire V240 Server

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Hinds MOD 4022-436-87411 Dual PEM Control Card ASML

ASML 4022 437 1312 Agilent Circuit Board 7107-9731-0124 ASML

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ASML 4022 436 7114 Circuit Board

ASML 4022 437 0576 Circuit Board

ASML 4022 437 2993 PW CD Circuit Board

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ASLM 4022 471 7311 Relay Board LISAF 3P

Agilent 4022 470 78501 Z4382A Combiner Interface Circuit Board N1224-60003 ASML

Agilent 4022 470 81312 Z4207C Number Cruncher ASML

Heidenhain 4022 470 78514 HIB 292 Circuit Board 375 110-04 C7 ASML

Agilent 4022 470 06582 Z4206A I/O Card Circuit Board Z4206-60003 ASML

Agilent 4022 471 6240 Circuit Board ASML

RKC TEL 3D80-000090-V5 Power Supply Temperature Controller RCB-12 TEL T-3044SS

Nikon 4S013-570 Circuit Board MIS-PACONX4S

Agilent Z4381-60001 Phase Detector Circuit Board Nikon NSR

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AMAT Applied Materials 0200-07492 Ring Rev. 02 New Surplus

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IKC 1SV25MO Angle Isolation Valves (Lot of 30)

TDK MSE181H Power Supply TEL Act 12

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MOOG 100-000-943 Motion Controller BX-300 AMAT Quantum X Factory Interface

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AMAT 9090-00846 Beamline Power Distribution Unit AMAT Quantum X Control Rack

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