GJL1213001R11-RELAYBC6-30-01
PLC是一种专门为在工业环境下应用而设计的数字运算操作的电子装置。它采用可以编制程序的存储器，用来在其内部存储执行逻辑运算、顺序运算、计时、计数和算术运算等操作的指令，并能通过数字式或模拟式的输入和输出，控制各种类型的机械或生产过程。PLC及其有关的外围设备都应该按易于与工业控制系统形成一个整体，易于扩展其功能的原则而设计。什么是plc控制系统?其实简单的理解呢，PLC就相当于机器的大脑，我们编的程序就相当于人所撑握的知识与规则。机器就相当于人的躯体，用来执行PLC的各种动作。电，气，液等就相当于人的肌肉与神经，PLC发出指令，通过电，气，液等将能量传给机器，机器就执行。传感器将外界情况反馈给PLC,就相当于人的眼，鼻等，将外界事物反馈给大脑。
也就是说拿一个人或者动物来打比方，PLC就是大脑，PLC跟机器的结合就相当于人的大脑跟躯体的结合，,只是人的大脑里面的程序比PLC要复杂得多，但是人的大脑的灵敏度及准确性不及PLC。
但电脑的系统我们一般人不会写，就算会写，系统配置也太浪费了，而plc程序学学就会了，而且也很简单，我们可以通过对它编程，控制我们要控制的对象，就OK了！所以它用在工业控制领域，以及其他需要智能控制的领域！
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