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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(gè)數(shù)據(jù)存儲(chǔ)單元有哪些，分別是存儲(chǔ)什么數(shù)據(jù)的？
答：一般你在編輯程序快時(shí)，如在插入一個(gè)快時(shí)，在SIAMTIC管理器中，選定菜單“Insert（插入）/S7 Block（S7塊）/Organization Block時(shí)，其中就有選項(xiàng)”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(dòng)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(chǔ)區(qū)除有三個(gè)基本存儲(chǔ)單元（系統(tǒng)存儲(chǔ)器、裝載存儲(chǔ)區(qū)和工作存儲(chǔ)區(qū)）外，還有外設(shè)I/O存儲(chǔ)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(chǔ)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(gè)狀態(tài)位），其中三個(gè)基本存儲(chǔ)區(qū)儲(chǔ)存的數(shù)據(jù)如下：
系統(tǒng)存儲(chǔ)區(qū)：數(shù)字量輸入/輸出過程映像寄存器I/Q、位存儲(chǔ)區(qū)（根據(jù)CPU的型號(hào)大小不同）、定時(shí)器T和計(jì)算器C；
工作存儲(chǔ)區(qū)：存放CPU運(yùn)行時(shí)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(shí)本地?cái)?shù)據(jù)存儲(chǔ)區(qū)（L堆棧）；
裝載存儲(chǔ)區(qū)：動(dòng)態(tài)裝載存儲(chǔ)區(qū)RAM（存放用戶程序）、可選的內(nèi)置的固定裝載存儲(chǔ)區(qū)（FEPROM），用于保存不包含符號(hào)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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