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問：西門子PLC梯形圖和指令表相互轉(zhuǎn)換有哪位朋友知道??？還有西門子S7-300里的各個數(shù)據(jù)存儲單元有哪些，分別是存儲什么數(shù)據(jù)的？
答：一般你在編輯程序快時，如在插入一個快時，在SIAMTIC管理器中，選定菜單“Insert（插入）/S7 Block（S7塊）/Organization Block時，其中就有選項”Created in language”（選擇編程語言，LAD/STL/FBD），選定編程語言后，你的程序語言就確定了；當(dāng)然，你也可以在打開的程序快（LAD/STL/FBD編輯器）中通過菜單View（查看）在三種編程語言（在LAD（梯形圖）、STL（語句表）和FBD（功能塊圖））之間切換；
STEP7支持LAD/STL/FBD這所種語言的混合編程以及相互之間的轉(zhuǎn)換。一般來說LAD和FBD程序都可以通過STEP7自動轉(zhuǎn)換為STL語言，但是并非所有的STL語言都可以轉(zhuǎn)換為LAD和FBD。
S7-300PLC的存儲區(qū)除有三個基本存儲單元（系統(tǒng)存儲器、裝載存儲區(qū)和工作存儲區(qū)）外，還有外設(shè)I/O存儲區(qū)（直接訪問本地的和分布式的輸入和輸出模擬量模塊）、累加器（ACCU1和ACCU2）、地址寄存器（AR1、AR2）、數(shù)據(jù)塊地址存儲器（打開共享數(shù)據(jù)塊DB和打開背景數(shù)據(jù)塊DI）和狀態(tài)字寄存器（16個狀態(tài)位），其中三個基本存儲區(qū)儲存的數(shù)據(jù)如下：
系統(tǒng)存儲區(qū)：數(shù)字量輸入/輸出過程映像寄存器I/Q、位存儲區(qū)（根據(jù)CPU的型號大小不同）、定時器T和計算器C；
工作存儲區(qū)：存放CPU運行時執(zhí)行的用戶程序和數(shù)據(jù)（邏輯快OB/FB/FC、數(shù)據(jù)塊DB）、臨時本地數(shù)據(jù)存儲區(qū)（L堆棧）；
裝載存儲區(qū)：動態(tài)裝載存儲區(qū)RAM（存放用戶程序）、可選的內(nèi)置的固定裝載存儲區(qū)（FEPROM），用于保存不包含符號地址和注釋的用戶程序和系統(tǒng)數(shù)據(jù)（組態(tài)、連接和模塊參數(shù)等）
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