6SL3353-3AE36-1AA0西门子产品

6SL3353-3AE36-1AA0

　1、PLC有五种标准化编程语言顺序功能图（SFC）、梯形图（LD）、功能模块图（FBD）三种图形化语言和语句表（IL）、结构文本（ST）两种文本语言，常用的两种编程语言，一是梯形图，二是助记符语言表。采用梯形图编程因为它直观易懂，但需要一台个人计算机及相应的编程软件；采用助记符形式便于实验，因为它只需要一台简易编程器。

　　2、梯形图语言是plc程序设计中常用的编程语言。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。 指令表编程语言是与汇编语言类似的一种助记符编程语言，和汇编语言一样由操作码和操作数组成。功能模块图语言是与数字逻辑电路类似的一种plc编程语言。采用功能模块图的形式来表示模块所具有的功能。

　　3、PLC 有很多种类，三菱，西门子，欧姆龙，PLC编程语言很简单的，有梯形图，语句表，功能图 等等，常用的是梯形图，放心这个不难懂得，常用的是梯形图，其次助记符号，然后步进图，剩下的就是不同厂家的所谓的汇编语言了。就是梯形体图或其他图里的扫描的进程。开光量导通了，扫描就通过继续扫描。

　　1、 PLC的五种编程语言是：2、 序列图：序列图是一种图形语言，位于其他编程语言之上，主要用于编译顺序控制程序。功能图为组织程序提供了一个图形化的方向，可以用来描述系统的功能。据此可以很容易地绘制梯形图。3、 梯形图：梯形图是PLC编程常用的图形编程语言。上面提到的梯形图与传统继电器控制系统的电路图非常相似，具有直观易懂的优点。熟悉厂内继电器控制系统的电气人员很容易掌握，特别适用于开关量的逻辑控制。梯形图由接触式、线圈和方框表示的功能块组成。代表触点的逻辑输入条件，如外部开关、按钮等。该线圈通常代表逻辑输出结果，用于控制外部指示灯、接触器等。该功能块用于表示定时器、计数器或数学运算的附加指令等。4、 功能图：这是一种类似数字逻辑门电路的编程语言，有数字电路基础的人很容易掌握。编程语言使用“与”门、或“与”门和“非”门等模块来表达逻辑运算关系。盒子左边是逻辑运算的输入变量，右边是输出变量，信号从左向右流动。5、 指令表：(西门子称为语句表)由若干条指令组成的程序称为指令表。PLC的指令是一种类似于微机汇编语言中指令的助记符表达式，由操作码和操作数组成。小型PLC的指令系统比汇编语言简单得多，只需要20条指令就可以控制开关量。但是指令表程序很难读懂，其逻辑关系很难一目了然。因此，在设计复杂的开关控制程序时，一般采用梯形图。指令表可以处理一些梯形图无法处理的问题。

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