1756-TC15｝ABGE—IC697VAL314

1756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL3141756-TC15｝ABGE—IC697VAL314

PLC是专为工业自动控制而开发的装置，通常PLC采用面向控制过程，面向问题的“自然语言”编程。不同厂家的产品采用的编程语言不同，这些编程语言有梯形图、语句表、控制系统流程图等。为了增强PLC的各种运算功能，有的PLC还配有BASIC语言，并正在探索用其他高级语言来编程。

日本的FANUC公司、立石公司、三菱公司、富士公司等所生产的PLC产品，都采用梯形图编程。在用编程器向PLC输入程序时，一般简易编程器都采用编码表输入，大型编程器也可用梯形图直接输入。在众多的PLC产品中，由于制造厂家不同，其指令系统的表示方法和语句表中的助记符也不尽相同，但原理是完全相同的。在本书中我们以FANUC-PMC-L为例，对适用于数控机床控制的PLC指令作一介绍。在FANUC系列的PLC中，规格型号不同时，只是功能指令的数目有所不同，如北京机床研究所与FANUC公司合作开发的FANUC-BESK PLC-B功能指令23条，除此以外，指令系统是完全一样的。

在FANUC-PMC-L中有两种指令：基本指令和功能指令。当设计顺序程序时，使用*多的是基本指令，基本指令共12条。功能指令便于机床特殊运行控制的编程，功能指令有35条。

在基本指令和功能指令执行中，用一个堆栈寄存器暂存逻辑操作的中间结果，堆栈寄存器有9位（如图1所示），按先进后出、后进先出的原理工作。当前操作结果压入时，堆栈各原状态全部左移一位；相反地取出操作结果时堆栈全部右移一位，*后压入的信号首先恢复读出。

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