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DS200DCFBG2BNC
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产品: 浏览次数:0DS200DCFBG2BNC 
品牌: GE
单价: 888.00元/件
最小起订量: 1 件
供货总量: 1 件
发货期限: 自买家付款之日起 1 天内发货
有效期至: 长期有效
最后更新: 2015-05-07
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详细信息
   可编程序控制器(PLC)的特点  扣扣2315341796
为适应工业环境使用,与一般控制装置相比较,PLC机有以下特点:

1. 可靠性高,抗干扰能力强

    工业生产对控制设备的可靠性要求:

平均故障间隔时间长

故障修复时间(平均修复时间)短

任何电子设备产生的故障,通常为两种:

     ①偶发性故障。由于外界恶劣环境如电磁干扰、超高温、超低温、过电压、欠电压、振动等引起的故障。这类故障,只要不引起系统部件的损坏,一旦环境条件恢复正常,系统也随之恢复正常。但对PLC而言,受外界影响后,内部存储的信息可能被破坏。

     ②**性故障。由于元器件不可恢复的破坏而引起的故障。

如果能限制偶发性故障的发生条件,如果能使PLC在恶劣环境中不受影响或能把影响的后果限制在**小范围,使PLC在恶劣条件消失后自动恢复正常,这样就能提高平均故障间隔时间;如果能在PLC上增加一些诊断措施和适当的保护手段,在**性故障出现时,能很快查出故障发生点,并将故障限制在局部,就能降低PLC的平均修复时间。为此,各PLC的生产厂商在硬件和软件方面采取了多种措施,使PLC除了本身具有较强的自诊断能力,能及时给出出错信息,停止运行等待修复外,还使PLC具有了很强的抗干扰能力。

 

·硬件措施

主要模块均采用大规模或超大规模集成电路,大量开关动作由无触点的电子存储器完成,I/O系统设计有完善的通道保护和信号调理电路。

    屏蔽——对电源变压器、CPU、编程器等主要部件,采用导电、导磁良好的材料进行屏蔽,以防外界干扰。

    滤波——对供电系统及输入线路采用多种形式的滤波,如LC或π型滤波网络,以消除或抑制高频干扰,也削弱了各种模块之间的相互影响。

    电源调整与保护——对微处理器这个核心部件所需的+5V电源,采用多级滤波,并用集成电压调整器进行调整,以适应交流电网的波动和过电压、欠电压的影响。

    隔离——在微处理器与I/O电路之间,采用光电隔离措施,有效地隔离I/O接口与CPU之间电的联系,减少故障和误动作;各I/O口之间亦彼此隔离。

    采用模块式结构——这种结构有助于在故障情况下短时修复。一旦查出某一模块出现故障,能迅速更换,使系统恢复正常工作;同时也有助于加快查找故障原因。

·软件措施:

    有极强的自检及保护功能。

故障检测——软件定期地检测外界环境,如掉电、欠电压、锂电池电压过低及强干扰信号等。以便及时进行处理。

信息保护与恢复——当偶发性故障条件出现时,不破坏PLC内部的信息。一旦故障条件消失,就可恢复正常,继续原来的程序工作。所以,PLC在检测到故障条件时,立即把现状态存入存储器,软件配合对存储器进行封闭,禁止对存储器的任何操作,以防存储信息被冲掉。

设置警戒时钟WDT(看门狗)——如果程序每循环执行时间超过了WDT规定的时间,预示了程序进入死循环,立即报警。

加强对程序的检查和校验——一旦程序有错,立即报警,并停止执行。

对程序及动态数据进行电池后备——停电后,利用后备电池供电,有关状态及信息就不会丢失。

    PLC的出厂试验项目中,有一项就是抗干扰试验。它要求能承受幅值为1000V,上升时间1nS,脉冲宽度为1μS的干扰脉冲。一般,平均故障间隔时间可达几十万~上千万小时;制成系统亦可达45万小时甚至更长时间。

2 .通用性强,控制程序可变,使用方便

PLC品种齐全的各种硬件装置,可以组成能满足各种要求的控制系统,用户不必自己再设计和制作硬件装置。用户在硬件确定以后,在生产工艺流程改变或生产设备更新的情况下,不必改变PLC的硬设备,只需改编程序就可以满足要求。因此,PLC除应用于单机控制外,在工厂自动化中也被大量采用。

3.功能强,适应面广

现代PLC不仅有逻辑运算、计时、计数、顺序控制等功能,还具有数字和模拟量的输入输出、功率驱动、通信、人机对话、自检、记录显示等功能。既可控制一台生产机械、一条生产线,又可控制一个生产过程。

4.编程简单,容易掌握

目前,大多数PLC仍采用继电控制形式的“梯形图编程方式”。既继承了传统控制线路的清晰直观,又考虑到大多数工厂企业电气技术人员的读图习惯及编程水平,所以非常容易接受和掌握。梯形图语言的编程元件的符号和表达方式与继电器控制电路原理图相当接近。通过阅读PLC的用户手册或短期培训,电气技术人员和技术工很快就能学会用梯形图编制控制程序。同时还提供了功能图、语句表等编程语言。

PLC在执行梯形图程序时,用解释程序将它翻译成汇编语言然后执行(PLC内部增加了解释程序)。与直接执行汇编语言编写的用户程序相比,执行梯形图程序的时间要长一些,但对于大多数机电控制设备来说,是微不足道的,完全可以满足控制要求。

5.减少了控制系统的设计及施工的工作量

由于PLC采用了软件来取代继电器控制系统中大量的中间继电器、时间继电器、计数器等器件,控制柜的设计安装接线工作量大为减少。同时,PLC的用户程序可以在实验室模拟调试,更减少了现场的调试工作量。并且,由于PLC的低故障率及很强的监视功能,模块化等等,使维修也极为方便。

6.体积小、重量轻、功耗低、维护方便

PLC是将微电子技术应用于工业设备的产品,其结构紧凑,坚固,体积小,重量轻,功耗低。并且由于PLC的强抗干扰能力,易于装入设备内部,是实现机电一体化的理想控制设备。以三菱公司的F1-40MPLC为例:其外型尺寸仅为305×110×110mm,重量2.3kg,功耗小于25VA;而且具有很好的抗振、适应环境温、湿度变化的能力。现在三菱公司又有FX系列PLC,与其超小型品种F1系列相比:面积为47%,体积为36%,在系统的配置上既固定又灵活,输入输出可达24128点。

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link-BELT 1341Y222-B 1341Y222B SIZE XR-1-1/2 XR COUPLING ACCESSORY PACK NEW


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NEW THE GENERAL ROLLER BEARING 210DD 6210 2RS 62102RS


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Donaldson Hydraulic Filter P171504 New in Box


SKF Roller Ball Bearing 7228 BCBM 7228BCBM New


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SNR Self Aligning Ball Bearing 22213.EA.B33J30 2213EAB33J30 New


Aetna Thrust Ball Bearing E-17 E17 Made in USA New


NEW Fafnir 3MM208WI DUM C1 Super Precision Bearing  3MM208WIDUMC1


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SKF Double Row Ball Bearing 5204 A-2Z/C3 5204A2ZC3 New


GE CR308B1**BAA SIZE SZ 0 115-120V COIL 208V FUSIBLE MOTOR STARTER COMBO


TIMKEN FAFNIR 4 BOLT FLANGE RCJ2 G1200KRRB C1 12V W232-5 271-1 PILLOW BLOCK 


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AUTOMATION SERVICES & ConSULTANTS CIRCUIT BOARD CARD 100142 REV B


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INA Ball Bearing 3208-2Z 32082Z New


SKF Two Bolt Pillow Block Bearing SYH 107X SYH107X 477207-107 477207107 New


The General Roller Bearing 6306-88-30E 63068830E 6306RS New


NEW SKF BEARING 6304-Z/C3QE6 6304ZC3QE6 6304-Z/C3 6304ZC3 


NTN Insert Bearing UCS207LD1NW2C3 UCS207C3 New


NEW SKF 4NU11 NU 411 ROLLER BEARING


NEW FAFNIR 10613 G1100KLLB 4-BOLT FLANGE BEARING W/ COLLAR G1100KLLB S100K


NEW MRC BEARING 204SFF H501 6204-2Z/C3 62042ZC3


NEW NTN UCFCX10D1 FLANGE CARTRIDGE BEARING  UCX10 FCX10J UCFCX10J91


FAFNIR GC1010KRRB + COL BEARING W/ COLLAR New


NEW SKF BEARING 608-2Z/LHT23 6082ZLHT23 


NEW TIMKEN FAFNIR 2 BOLT FLANGE BEARING W/COLLAR VCJT 3/4 GRA012RRB


No Name Thrust Bearing SK9020-9 SK90209 New


Bower Roller Bearing Cup Tapered Double 353-D 353D New


Fafnir Double Row Ball Bearing W208KLL W208 New


PROLUME MAGNETIC BALLAST M240RS/277 277 V VOLT CLASS P TYPE 1 


NEW NO NAME S/S STAINLESS STEEL SET SCREW LOCKING SHAFT COLLAR 1-7/8"ID 2-3/4"OD


NEW INA / ANDREWS 915 THRUST BEARING 


NEW SKF BEARING WITH INNER RACE 3 NU 11 3NU11 NU 311 NU311


Koyo Roller Bearing 22210EC3 22214RHRW33C3 New


SKF Double Row Ball Bearing 5216 A/C3 5216AC3 8014X44.4MM New


CUTLER HAMMER DH325NGK 400A 400 A AMP 240V FUSIBLE SAFETY DISConNECT SWITCH NIB


NEW BOWER OUTER BEARING RACE CUP HM89411


NEW FAG BEARING 629.2RS 6000.629RS "LOT OF 3"


NEW SEALMASTER SEAL MASTER BEARING 60-12 3/4"BORE 2-012 6012 2012


LOT OF 2 Steyr Deep Groove Single Row Roller Ball Bearing 2201 New In Box


NEW SEALMASTER SEAL MASTER TREL 12 ROD END HEIM JOINT 3/4-16 THREAD 3/4" BORE 


Fafnir Radial Ball Bearing 311K New


NEW NTN SEALED BALL BEARING 6308LLBC3/5C  6308LLBC35C  6308LB 


NEW TIMKEN TAPERED ROLLER BEARING 597


NEW SKF SELF ALIGNING BALL BEARING 1318 K C3 1318KC3 N 18 N18


NEW SUPER TORQUE TIMING BELT S8M 656 S8M656 1-9/16" WIDTH 


NEW MB 4 BOLT FLANGE BEARING FCA-25-1 3/16   FCA2513/16


P&H PART BEARING 25Z685D5 P/O 00261527


NEW TIMKEN OUTER BEARING RACE 4335


CROUSE HINDS EXPLOSION PROOF PIN & SLEEVE PLUG BP-59 3 POLE 3P 2 W 2W 1 PH 1PH


Koyo Sealed Ball Bearing 62122RSC3 GXM 62122RSC3GXM New


NTN Rubber Sealed Roller Ball Bearing 6207LLBC3/L627 6207LLBC3L627 6207LB New


Fafnir Single Row Ball Bearing 216W Made in the USA New


NEW FAFNIR GN104KRRB C1  BEARING W/ COLLAR SN104K 


NEW NTN BEARING RACE 4T-3520 3520


NEW NILFISK D50 GREY RUBBER CONE INDUSTRIAL VACUUM ACCESSORY 80650900


FAG Single Row Ball Bearing 6208.2RSR.C3 62082RSRC3 6208.C3 6208C3 New


NEW ZKL BALL BEARING 6002 2RS C3 60022RSC3 6002-2RS


Resun 1" NPT Pipe Plug Valve R1430 w. Handle New


SNR Sealed Roller Ball Bearing 6306 J30 6306J30 New


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