品牌:P0971WV DNBT
起订:1件
供应:100件
发货:3天内
P0971WV DNBT P0971WV DNBT P0971WV DNBT
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，美国电气制造商协会NEMA（National Electrical Manufactory Association）经过四年的调查工作，于1984年首先将其正式命名为PC（Programmable Controller），并给PC作了如下定义：
联 系 人：李素云
QQ：1587052687 ,806403614
联系电话：0592-5165501
手机:18965423501
联系邮箱：1587052687@qq.com
联 系 人：李素云
QQ：1587052687 ,806403614
联系电话：0592-5165501
手机:18965423501
联系邮箱：1587052687@qq.com
“PC是一个数字式的电子装置，它使用了可编程序的记忆体储存指令。用来执行诸如逻辑，顺序，计时，计数与演算等功能，并通过数字或类似的输入/输出模块，以控制各种机械或工作程序。一部数字电子计算机若是从事执行PC之功能的，亦被视为PC，但不包括鼓式或类似的机械式顺序控制器。”
以后国际电工委员会(IEC)又先后颁布了PLC标准的草案第一稿，第二稿,并在1987年2月通过了对它的定义：
“可编程控制器是一种数字运算操作的电子系统，专为在工业环境应用而设计的。它采用一类可编程的存储器，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一个整体，易于扩充其功能的原则设计。”
总之，可编程控制器是一台计算机，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一具体工业应用，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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