140CPU67160
140CPU67160
140CPU67160
1、梯形图语言（LD）
梯形图语言是PLC程序设计中常用的编程语言。它是与继电器线路类似的一种编程语言。由于电气设计人员对继电器控制较为熟悉，因此，梯形图编程语言得到了广泛的欢迎和应用。
梯形图编程语言的特点是：与电气操作原理图相对应，具有直观性和对应性；与原有继电器控制相一致，电气设计人员易于掌握。
梯形图编程语言与原有的继电器控制的不同点是，梯形图中的能流不是实际意义的电流，内部的继电器也不是实际存在的继电器，应用时，需要与原有继电器控制的概念区别对待。
图1是典型的交流异步电动机直接启动控制电路图。图2是采用PLC控制的程序梯形图。
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GENERAL ELECTRIC DS3827BP6A2EFAD USPP DS3827BP6A2EFAD
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