6FX1120-5CA01---6FX1120-5CA01

 STEP7中用于檢查PLC用戶程序的參考數(shù)據(jù)主要有以下幾類：
    ①交叉參考表（Cross-reference）?？梢砸员砀竦男问讲榭碢LC內(nèi)部存儲區(qū)中的全部I、Q、M、P、T、C以及DB、FB、FC、SFB、SFC在程序中的交叉使用情況。
    ②存儲賦值表(Assignment)。可以查看用戶程序的全部輸入、輸出、標(biāo)志寄存器、定時器、計數(shù)器的已使用或未使用情況。
    ③程序結(jié)構(gòu)( Program Structure)?？梢圆榭从脩舫绦騼?nèi)的所有組成塊的分層調(diào)用情況、調(diào)用結(jié)構(gòu)以及嵌套層次情況。
    ④未用符號(Unused Symbols)?？梢圆榭匆言诜柋碇卸x，但未在用戶程序的任何地方使用的符號地址。
    ⑤無符號地址(Addresses without Symbol)。可以查看實際已經(jīng)被用戶程序使用，但未在符號表中進(jìn)行定義的絕對地址。

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