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问：西门子PLC梯形图和指令表相互转换有哪位朋友知道啊？还有西门子S7-300里的各个数据存储单元有哪些，分别是存储什么数据的？
答：一般你在编辑程序快时，如在插入一个快时，在SIAMTIC管理器中，选定菜单“Insert（插入）/S7 Block（S7块）/Organization Block时，其中就有选项”Created in language”（选择编程语言，LAD/STL/FBD），选定编程语言后，你的程序语言就确定了；当然，你也可以在打开的程序快（LAD/STL/FBD编辑器）中通过菜单View（查看）在三种编程语言（在LAD（梯形图）、STL（语句表）和FBD（功能块图））之间切换；
STEP7支持LAD/STL/FBD这所种语言的混合编程以及相互之间的转换。一般来说LAD和FBD程序都可以通过STEP7自动转换为STL语言，但是并非所有的STL语言都可以转换为LAD和FBD。
S7-300PLC的存储区除有三个基本存储单元（系统存储器、装载存储区和工作存储区）外，还有外设I/O存储区（直接访问本地的和分布式的输入和输出模拟量模块）、累加器（ACCU1和ACCU2）、地址寄存器（AR1、AR2）、数据块地址存储器（打开共享数据块DB和打开背景数据块DI）和状态字寄存器（16个状态位），其中三个基本存储区储存的数据如下：
系统存储区：数字量输入/输出过程映像寄存器I/Q、位存储区（根据CPU的型号大小不同）、定时器T和计算器C；
工作存储区：存放CPU运行时执行的用户程序和数据（逻辑快OB/FB/FC、数据块DB）、临时本地数据存储区（L堆栈）；
装载存储区：动态装载存储区RAM（存放用户程序）、可选的内置的固定装载存储区（FEPROM），用于保存不包含符号地址和注释的用户程序和系统数据（组态、连接和模块参数等）
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