PPD513

一般讲，PLC分为箱体式和模块式两种。但它们的组成是相同的，对箱体式PLC，有一块板、I/O板、显示面板、内存块、电源等，当然按性能分成若干型号，并按I/O点数又有若干规格。对模块式PLC，有模块、I/O模块、内存、电源模块、底板或机架。无任哪种结构类型的PLC，都属于总线式开放型结构，其I/O能力可按用户需要进行扩展与组合。PLC的基本结构框图如下：

PLC中的是PLC的核心，起神经中枢的作用，每台PLC至少有一个，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，

与通用计算机一样，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，还有外围芯片、总线接口及有关电路。它确定了进行控制的规模、工作速度、内存容量等。内存主要用于存储程序及数据，是PLC不可缺少的组成单元。

控制器控制工作，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。

的运算器用于进行数字或逻辑运算，在控制器指挥下工作。

的寄存器参与运算，并存储运算的中间结果，它也是在控制器指挥下工作。

虽然划分为以上几个部分，但PLC中的芯片实际上就是微处理器，由于电路的高度集成，对内部的详细分析已无必要，我们只要弄清它在PLC中的功能与性能，能正确地使用它就够了。

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Microscan MS-4000 99-500003-19 Decoder Scanner MS4000

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Reliance Electric 415710-13A Meter Calibration PCB

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Foxboro I/A P0912HM 19″ Monitor Bay Mount P0912 HM 19

Square D Sz Size 3 Reversing Motor Starter Logic 8536

Westinghouse HUN365 Disconnect Safety Switch 400 Amp A

Cutler Hammer WH KD KD3400F KT3400T KD3400 400 A Amp

GE Fanuc IC600LR648K Logic Memory IC600LR648-K

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GE Spectra Series ADS32200HB Bus Plug 200 Amp Fusible

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Nemic-Lambda EWS300P-24 24V Power Supply EWS 300P-24

ITE Gould 5600 5640 Dual Breaker Feeder MCC Bucket 200A

Square D I-Line Circuit Breaker KC34125 125Amp 125 Amp

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Square D I-Line Current Limiting IK34200 200 Amp A

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GE 8000 Sz Size 3 50A CR306E0 Breaker MCC Bucket MCCB

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GE 8000 Series Size 3 Breaker Type MCC Bucket MCCB 50A

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GE 8000 Series Size 3 Breaker Type MCC Bucket MCCB 50A

GE 8000 Series Sz Size 3 Breaker MCC Bucket MCCB 50A

Square D I-Line Main Lug Panelboard 225 Amp 600 V 3P 4W

Westinghouse 100 Amp Bus Plug Fusible Switch ITAPN363HG

Westinghouse 100 Amp Bus Plug Fusible Switch ITAP363H

Cutler Hammer Westinghouse HKD3400F 300Amp 300 KT3300T

Cutler Hammer WH HJD HJD3250F JT3125T HJD3125 125 Amp A

General Electric SGLA36AT0600 400 Amp 400A A SRPG600A

Mitsubishi MTA-1000 Melsec Operator Interface MTA1000

Gemco Electric 1989-KP MagneTek 1989KP Control Panel

Square D Circuit Breaker KCL KCL34225 225Amp A 225 Amp

Cutler Hammer CH Freedom Unitrol Advantage Size 2 MCC B

ITE Gould 5600 Breaker Size 3 8502SEO MCC Bucket 100A

Siemens LU 02 Sitrans Dual Point Level Controller LU02

Mitsubishi FR-BR-30K Resistor Unit BKO-CA1072H 22

Siemens Marq 21 Size 3 Breaker Type MCC Bucket MCCB 50A

ABB ACS-601 AC Drive ACS601-0009-6 3PH 525-600 VAC 63Hz

GE 7700 Size Sz 3 Breaker MCC Bucket MCCB 100 A Amp

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