104X905BA603 104X905BA603 104X905BA603
PLC问世以来,尽管时间不长,但发展迅速。为了使其生产和发展标准化,国际电工委员会(IEC) 后颁布了PLC标准的草案 稿, 二稿,并在1987年2月通过了对它的定义:
“可编程控制器是 种数字运算操作的电子系统,专为在工业环境应用而设计的。它采用 类可编程的存储器,用于其内部存储程序,执行逻辑运算、顺序控制、定时、计数与算术操作等面向用户的指令,并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。可编程控制器及其有关外部设备,都按易于与工业控制系统联成 个整体,易于扩充其功能的原则设计。”
为了避免与个人计算机PC(Personal Computer)相混淆,所以改为PLC(Programmable Logic Controller)即可编程逻辑控制器,但从功能上讲,现在的PLC早已不是原来意义上的“PLC”了。
总之,可编程控制器是 台计算机,它是专为工业环境应用而设计制造的计算机。它具有丰富的输入、输出接口,并且具有较强的驱动能力。但可编程控制器产品并不针对某 具体工业应用,在实际应用时,其硬件需根据实际需要进行选用配置,其软件需根据控制要求进行设计编制。
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