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1756-L62
1756-L62
1756-L62
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可编程控制器，英文称ProgrammableLogicController，简称PLC。PLC是基于电子计算机，且适用于工业现场工作的电控制器。它源于继电控制装置，但它不像继电装置那样，通过电路的物理过程实现控制，而主要靠运行存储于PLC内存中的程序，进行入出信息变换实现控制。
PLC基于电子计算机，但并不等同于普通计算机。普遍计算机进行入出信息变换，多只考虑信息本身，信息的入出，只要人机界面好就可以了。而PLC则还要考虑信息入出的可靠性、实时性，以及信息的使用等问题。特别要考虑怎么适应于工业环境，如便于安装，抗干扰等问题。
1.1实现控制要点
输入输出信息变换、可靠物理实现，可以说是PLC实现控制的两个基本要点。
输入输出信息变换靠运行存储于PLC内存中的程序实现。PLC程序既有生产厂家的系统程序(不可更改)，又有用户自行开发的应用（用户）程序。系统程序提供运行平台，同时，还为PLC程序可靠运行及信号与信息转换进行必要的公共处理。用户程序由用户按控制要求设计。什么样的控制要求，就应有什么样的用户程序。
可靠物理实现主要靠输人（INPUT）及输出（OUTPUT）电路。PLC的I/O电路，都是专门设计的。输入电路要对输入信号进行滤波，以去掉高频干扰。而且与内部计算机电路在电上是隔离的，靠光耦元件建立联系。输出电路内外也是电隔离的，靠光耦元件或输出继电器建立联系。输出电路还要进行功率放大，以足以带动一般的工业控制元器件，如电磁阀、接触器等等。
I/O电路是很多的，每一输入点或输出点都要有一个I或O电路。PLC有多I/O用点，一般也就有多少个I/O用电路。但由于它们都是由高度集成化的电路组成的，所以，所占体积并不大。
输入电路时刻监视着输入状况，并将其暂存于输入暂存器中。每一输入点都有一个对应的存储其信息的暂存器。
输出电路要把输出锁存器的信息传送给输出点。输出锁存器与输出点也是一一对应的
这里的输入暂存器及输出锁存器实际就是PLC处理器I/O口的寄存器。它们与计算机内存交换信息通过计算机总线，并主要由运行系统程序实现。把输人暂存器的信息读到PLC的内存中，称输入刷新。PLC内存有专门开辟的存放输入信息的映射区。这个区的每一对应位（bit）称之为输入继电器，或称软接点。这些位置成1，表示接点通，置成0为接点断。由于它的状态是由输入刷新得到的，所以，它反映的就是输入状态。
输出锁存器与PLC内存中的输出映射区也是对应的。一个输出锁存器也有一个内存位（bit）与其对应，这个位称为输出继电器，或称输出线圈。靠运行系统程序，输出继电器的状态映射到输出锁存器。这个映射也称输出刷新。输出刷新主要也是靠运行系统程序实现的。这样，用户所要编的程序只是，内存中输入映射区到输出映射区的变换，特别是怎么按输入的时序变换成输出的时序。这是一个数据及逻辑处理问题。由于PLC有强大的指令系统，编写出满足这个要求的程序是完全可能的，而且也是较为容易的。
Warranty Allen Bradley 74103-236-52 1336-MCI-SP21A Main Control Board
BALOGH 3400/2E 9340255585,9340255589,3400/1E MATRIX CONTROL BOARD 31
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Rockwell Allen Bradley Inverter Snubber 1336-SN-SP16A PCB Inverter 1336SNSP16A
PANELVIEW 600 2711-B6C1 ALLEN BRADLEY 2711B6C1 EXCELLENT CONDITION.
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ALLEN BRADLEY 2.2KW/3HP VARIABLE SPEED AC DRIVE 1305-BA06A-HAP SER. C *PLASTIC*
Allen Bradley 194RNJ200P3 **GENUINE** 194R NJ200P3
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Allen Bradley 1794-IF4I/1794-IF41/1794IF4I/1794IF41 Cat Rev P03 SEALED!!!
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Allen Bradley 1784-KTX Communications card | Tested with 12 month warranty
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Allen Bradley 1775-A3 | Tested with 12 month warranty
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Allen Bradley 1769-L32E Series B CompactLogix Controller Processor EST SERIES
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ALLEN BRADLEY 1768-EWEB SERIES A, ETHERNET/IP ENHANCED WEB INTERFACE, *
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ALLEN BRADLEY 1756-PLS 1756PLS LIMIT SWITCH SERIES B CONTROLLOGIX I/O MODULE
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Allen Bradley 1756-EN2TR /A Ethernet/IP 10/100 Mbps ControlLogix 2 Port
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ALLEN BRADLEY 1746-NIO4I SERIES A ANALOG OUTPUT MODULE * IN A BOX*
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ALLEN BRADLEY 151088 **NNB**
Allen Bradley 14OUJ6D3-D25 Circuit Breaker
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Allen Bradley 1398-DDM-009-DN Drive 1398DDM009DN **XLNT**
ALLEN BRADLEY 1398-DDM-009 SERVO DRIVE 120/240 VOLT
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ALLEN BRADLEY 1336S-BRF30-AN-EN4-L4 AC DRIVE 3PH 480V INPUT 460V OUTPUT
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ALLEN BRADLEY 1336-B010-EAD-L3 SERIES A AC DRIVE **
ALLEN BRADLEY 1336 IMPACT AC DRIVE 1336E-BRF30-AN-EN SERD 99622
ALLEN BRADLEY 1332-AAA 1332AAA
ALLEN BRADLEY 1331-OAF20 1331OAF20
ALLEN BRADLEY 1331-OAF05 1331OAF05
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ALLEN BRADLEY 1305-BA03A-HA2 SERIES C **
ALLEN BRADLEY 1305-AA12A 1305AA12A
Allen Bradley 10HP Motor Control Bucket AC Drive
Allen Bradley 10HP Motor Control Bucket AC Drive
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Allen Bradley (810-A14C) Magnetic Overload Relay, Series A 600V Max, Surplus
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871T-A5J18FE ALLEN BRADLEY SENSORS
871IA-B10N30-N3 ALLEN BRADLEY SENSORS
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2711P-RP2 Ser E PanelView Plus Logic Module 24VDC 70W 128MB Allen Bradley HMI
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2014 Sealed 1769-AENTR CompactLogix Ethernet/IP Adapter Module Allen Bradley
2014 FACTORY SEALED ALLEN BRADLEY 1756-ENBT A ETHERNET/IP CONTROLLOGIX TAPE
1756-EN2T Ser C FW 3.006 ControlLogix Ethernet Bridge Module Allen Bradley PLC
1756-EN2T ALLEN BRADLEY COMMUNICATIONS BRIDGE
1756-EN2T /C Allen Bradley ControlLogix Ethernet Interface 1756EN2T N240
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1336-B003-EAD-S1 ALLEN BRADLEY DRIVES REMANUFACTURED
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