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，使用最多的是基本指令，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，最后压入的信号首先恢复读出。

Allen-Bradley AC Drive 10 HP 25B-B032N104 SER. A PowerFlex 525 FRN: 5.001 230V
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 SIEMENS SIMATIC 560T 560-2123 POWER SUPPLY MODULE 24VDC 560-21 NEW
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(New) Rosemount PH Analyzer 2054PH 115 VAC
(New) SIEMENS 1FT6102-8AF71-4AB0  27/Nm Brushless Servo Motor 
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(NEW) SIEMENS 284-03060 599-01051 599-03060 8" Pneumatic Valve Actuator H.T.
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(NEW) SIEMENS ET200-HANDHELD 6ES5782-2MB11 Ver. 4&5 Handheld ET 200 Programmer
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(New) SQUARE D SY/MAX CLASS 8030 Type PS35 Power Supply 8030, PS 35, PS35 PS-35 
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(New) Square D SY/MAX Processor CLASS 8020 SCP-423 SER B4 REV 1.10 Model 400 
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