PLC的发展历程
在工业生产过程中，大量的开关量顺序控制，它按照逻辑条件进行顺序动作，并按照逻辑关系进行连锁保护动作的控制，及大量离散量的数据采集。传统上，这些功能是通过气动或电气控制系统来实现的。1968年美国GM（通用汽车）公司提出取代继电气控制装置的要求，第二年，美国数字公司研制出了基于集成电路和电子技术的控制装置，首次采用程序化的手段应用于电气控制，这就是第一代可编程序控制器，称ProgrammableController（PC）。
个人计算机（简称PC）发展起来后，为了方便，也为了反映可编程控制器的功能特点，可编程序控制器定名为ProgrammableLogicController（PLC），现在，仍常常将PLC简称PC。
PLC的定义有许多种。国际电工委员会（IEC）对PLC的定义是：可编程控制器是一种数字运算操作的电子系统，专为在工业环境下应用而设计。它采用可编程序的存贮器，用来在其内部存贮执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，并通过数字的、模拟的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关设备，都应按易于与工业控制系统形成一个整体，易于扩充其功能的原则设计。
上世纪80年代至90年代中期，是PLC发展最快的时期，年增长率一直保持为30~40%。在这时期，PLC在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高，PLC逐渐进入过程控制领域，在某些应用上取代了在过程控制领域处于统治地位的DCS系统。
PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。PLC在工业自动化控制特别是顺序控制中的地位，在可预见的将来，是无法取代的。
SIEMENS 6ES5243-1AA13 ANALOG MODULE 6ES52431AA13 NEW
FANUC AO6B-0860-B401 SERVO MOTOR A06B-0860-B401#3000
NEW SQUARE D PHF360000M MOLDED CASE SWITCH 2000A
NEW SIEMENS 6ES5 241-1AA12 MODULE 6ES52411AA12
NEW BOSCH REXROTH 2AD132D-B35LB1-AS03-A2N1 MOTOR
NEW XYCOM XVME-690 CPU MODULE XVME690
NEW PERCEPTRON 911-0008 TRICAN SENSOR 9110008
NEW SIEMENS 6SC6112-2VA01 SIMODRIVE 6SC61122VA01
ALLEN BRADLEY 1785-V40B 1785V40B PLC-5 VME
SIEMENS 6GF3080-0VS81-0FP0 PC BOARD 6GF30800VS810FP0
NEW XYCOM XVME-979 MODULE
NEW ADIXEN ATP150 TURBO PUMP ATP 150 NO. N608442
ALLEN BRADLEY 1785-V80B 1785V80B PLC-5 VME
ALLEN BRADLEY 1785-V40L 1785V40L VME PLC5 5/40
ALLEN BRADLEY VME5 1785-V80B PROCESSOR 1785V80B
ABB ASEA BROWN BOVERI DRH-10050 SERVO DRIVE
SIEMENS R15E02A186 PC BOARD NEW
ALLEN BRADLEY 8520-3S5A-BAT-EX4-Y-1-2-3 SERVODRIVE
NEW SCHUNK SPG-100 GRIPPER 302121 SPG100
NEW ALLEN BRADLEY 1336F-BX040-AN-EN-HCS2-L6 40HP DRIVE
ID TECHNOLOGY MODEL 250 LABELER
NEW KAWATA VL-MC-FD PLASTIC VACUUM HOPPER DB5103070
NEW PERCEPTRON 912-0022 TRICAM SENSOR 9120022
NEW PERCEPTRON 912-0025 TRICAM SENSOR 9120025
SIEMENS 6ES5-928-3UB21 CPU MODULE 6ES5928-3UB21 NEW
TOTAL CONTROL CQPI31200C2P QUICKPANEL CQPI31200C2P-A
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