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PLC的编程及使用特点

   1．编程方法简单易学 

    梯形图是使用得最多的PLC的编程语言，其电路符号和表达方式与继电器电路原理图相似，梯形图语言形象直观，易学易懂，熟悉继电器电路图的电气技术人员只需花几天时间就可以熟悉梯形图语言，并用来编制用户程序。

    梯形图语言实际上是一种面向用户的高级语言，PLC在执行梯形图程序时，将它“翻译”成汇编语言后再去执行。

  2．功能强，性能价格比高     

  一台小型PLC内有成百上千个可供用户使用的编程元件，有很强的功能，可以实现非    常复杂的控制功能。与相同功能的继电器系统相比，具有很高的性能价格比。PLC可以通过通信联网，实现分散控制，集中管理。 

  3．硬件配套齐全，用户使用方便，适应性强 

  PLC产品已经标准化、系列化、模块化，配备有品种齐全的各种硬件装置供用户选用，用户能灵活方便地进行系统配置，组成不同功能、不同规模的系统。PLC的安装接线也很方便，一般用接线端子连接外部接线。PLC带负载能力，可以直接驱动一般的电磁阀和中小型交流接触器。 

  硬件配置确定后，通过修改用户程序，就可以方便快速地适应工艺条件的变化。 

  4．可靠性高，抗干扰能力强 

    传统的继电器控制系统中使用了大量的中间继电器、时间继电器。由于触点接触不良，容易出现故障。PLC用软件代替大量的中间继电器和时间继电器，仅剩下与输入和输出有关的少量硬件元件，接线可减少到继电器控制系统的十分之一到百分之一，因触点接触不良造成的故障大为减少。   

    PLC使用了一系列硬件和软件抗干扰措施，具有很强的抗干扰能力，平均无故障时间达到数万小时以上，可以直接用于有强烈干扰的工业生产现场，PLC大用户公认为最可靠的工业控制设备之一。 

  5．系统的设计、安装、调试工作量少 

    PLC用软件功能取代了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，使控制柜的设计、安装、接线工作量大大减少。 

    PLC的梯形图程序可以用顺序控制设计法来设计。这种编程方法很有规律，很容易掌握。对于复杂的控制系统，如果掌握了正确的设计方法，设计梯形图的时间比设计继电器系统电路图的时间要少得多。 

    可以在实验室模拟调试PLC的用户程序，输入信号用小开关来模拟，可通过PLC发光二极管观察输出信号的状态。完成了系统的安装和接线后，在现场的统调过程中发现的问题一般通过修改程序就可以解决，系统的调试时间比继电器系统少得多。 

  6．维修工作量小，维修方便 

    PLC的故障率很低，且有完善的自诊断和显示功能。PLC或外部的输入装置和执行机构发生故障时，可以根据PLC上的发光二极管或编程器提供的信息方便地查明故障的原因，用更换模块的方法可以迅速地排除故障。 

  7．体积小，能耗低 

    对于复杂的控制系统，使用PLC后，可以减少大量的中间继电器和时间继电器，小型PIC的体积仅相当于几个继电器的大小，因此可将开关柜的体积缩小到原来的l/2~1/10。 

    PLC控制系统的配线比继电器控制系统的少得多，故可以省下大量的配线和附件，减少很多安装接线工时，加上开关柜体积的缩小，可以节省大量的费用。

福州卓凯电子科技有限公司联系人：林工
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产品价格以电话或者QQ询价为准，发布价格及图片不做参考

Allen-Bradley PCB Circuit Board UIB 634174-90 Rev 6 _ 63417490

Allen-Bradley PCB Circuit Board UIB 634174-90 Rev 7 _ 63417490

Allen-Bradley PCB Circuit Board UIG 6346993

Allen-Bradley PCB Circuit Board UMA 634281A CNC PLC

Allen-Bradley PCB Circuit Board UOD 634347-90 REV-3

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Allen-Bradley PCB Circuit Board, # 634275, Revision 6,

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Allen-Bradley PCP Board # 8000-KAD Clean!

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Allen-Bradley PLC Board 63-4623 5600-396**

Allen-Bradley PLC Board 636021 Rev 5

ALLEN-BRADLEY PLC Board Swing Arm 1771 WA

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ALLEN-BRADLEY POTENTIOM ETER LED BOARD 111607 NNB

ALLEN-BRADLEY POWER BOARD 5 REV 06 0906

ALLEN-BRADLEY POWER BOARD 50906 REV 06

ALLEN-BRADLEY POWER BOARD S50906  50906

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ALLEN-BRADLEY POWER CIRCUIT BOARD 634434-90 REV-5 RODI 92-020 SROCB5NI

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Allen-Bradley Power Driver Board 50283 With 50284-003 Snubber Assembly

ALLEN-BRADLEY POWER PCB DRIVE CIRCUIT BOARD 1HP 460V 42305-118-52 4230511852 F

ALLEN-BRADLEY POWER PCB DRIVE CIRCUIT BOARD 1HP 460V 42305-118-53 4230511853

ALLEN-BRADLEY POWER SUPPLY & CONTROL BOARD 2700C-S2 SER. A

Allen-Bradley Power Supply Board 02-30481-0001

Allen-Bradley Power Supply Board 151082  #37257

Allen-Bradley Power Supply Board 151083  #37256

Allen-Bradley Power Supply Board 151084  #37255

ALLEN-BRADLEY POWER SUPPLY BOARD 50248

ALLEN-BRADLEY POWER SUPPLY BOARD 77135-217-51 W/ 77135-237-51

ALLEN-BRADLEY POWER SUPPLY BOARD 77144-270-51 7714427051

ALLEN-BRADLEY POWER SUPPLY CIRCUIT BOARD 7300-VPE 7300VPE 634434-90 REV 5

ALLEN-BRADLEY POWER SUPPLY CIRCUIT BOARD 7300-VPE 7300VPE 634434A

ALLEN-BRADLEY POWER SUPPLY CIRCUIT BOARD CARD 960261 REV 1

ALLEN-BRADLEY POWER SUPPLY DRIVE CIRCUIT BOARD 173169 173168 REV 04

ALLEN-BRADLEY POWER SUPPLY DRIVE CIRCUIT BOARD 74104-231-54 A74104-231-54 F

ALLEN-BRADLEY POWER SUPPLY DRIVE CIRCUIT BOARD A74104-246-54 A7410424654

ALLEN-BRADLEY POWER SUPPLY DRIVE CIRCUIT BOARD CARD 74104-231 A74104-231-52 B

ALLEN-BRADLEY POWER SUPPLY DRIVE CIRCUIT BOARD CARD 74104-231 A74104-231-52 F

ALLEN-BRADLEY POWER SUPPLY LOGIC BOARD 50389

ALLEN-BRADLEY POWER SUPPLY LOGIC BOARD 50389 REV. B

Allen-Bradley PowerFlex 354792-A01 Board

ALLEN-BRADLEY POWERFLEX 40 COMMUNICATION BOARD 315361-A01 REV 05 315361A01

Allen-Bradley Powerflex 700 P.N. ~ 314232-A01 ~ Encoder Board ~ Quantity ~

Allen-Bradley Powerflex 700 P.N. ~ 319284-A01 ~ Encoder Interface Board

Allen-Bradley Powerflex 700 P.N. 354792-A01 Encoder Board ~ Quantity ~

Allen-Bradley Preamp PC Board X-233114  #27168

ALLEN-BRADLEY PRECHARGE CIRCUIT BOARD 74101-075-55 REV C

ALLEN-BRADLEY PRECHARGE CIRCUIT BOARD 74101-075-55 REV C NIB

ALLEN-BRADLEY PRECHARGE CIRCUIT BOARD 74101-075-55 REV.09 4108

ALLEN-BRADLEY PRECHARGE CIRCUIT BOARD 74101-075-55 REV-04

ALLEN-BRADLEY PRECHARGE CIRCUIT BOARD AC DRIVE 1336-PB-SP2B 74101-502-51 REV G

ALLEN-BRADLEY PRECHARGE CIRCUIT BOARD CARD 150HP 140311 140069 REV 08

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ALLEN-BRADLEY PRINTED CIRCUIT BOARD 1336E-MC2-SP42A 74103-193-55

ALLEN-BRADLEY PRINTED CIRCUIT BOARD 74103-217-02A

ALLEN-BRADLEY PRINTED CIRCUIT BOARD ETA 006-02

ALLEN-BRADLEY PROCESSOR INTERFACE BOARD PANEL 7300-VHA1 634527-02 634492-01

Allen-Bradley Processor Module Board M# 7300-UPV1 ~Repaired Surplus~

ALLEN-BRADLEY PROCESSOR MODULE BOARD REV.01 8520CPUX / 90781001

Allen-Bradley PTI Control Adjustable Frequency Motor Drive Logic Board 50347-001

Allen-Bradley Quad AC Output Board, 1720-B1404, Ser. D,

Allen-Bradley Quad AC Output Board, 1720-B1414, Ser. E,

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Allen-Bradley Ram Memory Module Board, # 1772-ME,