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*個(gè)字符必須使用字母或“_"。
跳轉(zhuǎn)規(guī)則：可以向前或向后跳轉(zhuǎn)，跳轉(zhuǎn)指令和跳轉(zhuǎn)目的必須在同一個(gè)塊中（zui大跳轉(zhuǎn)長度為64K字節(jié)）；在一個(gè)塊中跳轉(zhuǎn)目的只能出現(xiàn)一次；跳轉(zhuǎn)指令可以用在FB、FC和OB中。
條件跳轉(zhuǎn)：有兩個(gè)：JC——當(dāng)RLO=1時(shí)，JC才執(zhí)行，當(dāng)RLO=0時(shí)，不跳轉(zhuǎn)，繼續(xù)執(zhí)行下面的程序，但置RLO=1。 JCN——當(dāng)RLO=0時(shí)，JCN才執(zhí)行，當(dāng)RLO=1時(shí)，不跳轉(zhuǎn)。
邊沿檢測：RLO-邊沿檢測和信號(hào)-邊沿檢測。
RLO-邊沿檢測：當(dāng)邏輯操作結(jié)果變化時(shí)，產(chǎn)生RLO邊沿。檢測正邊沿FP——RLO從“0"變化到“1"，“FP"檢查指令產(chǎn)生一個(gè)“掃描周期"的信號(hào)“1"；檢測負(fù)邊沿FN，則RLO從“1"變化到“0"，“FN"檢查指令產(chǎn)生一個(gè)“掃描周期"的信號(hào)“1"。上述兩個(gè)結(jié)果保存在“FP（FN）"位存儲(chǔ)器中或數(shù)據(jù)位中，如M 1.0…，同時(shí)，可以輸出在其他線圈。
信號(hào)-邊沿檢測：同上面的RLO指令類似，當(dāng)信號(hào)變化時(shí)，產(chǎn)生信號(hào)邊沿，也有正/負(fù)邊沿之分：POS/NEG。
上述各種指令，請(qǐng)結(jié)合實(shí)際軟件，掌握其方法、特性和不同之處，其他復(fù)雜指令請(qǐng)參考各種高級(jí)編程手冊(cè)。

數(shù)字指令 
手機(jī)

： 

 Qq:

鄭娟萍

廈門仲鑫航自動(dòng)化設(shè)備有限公司在討論數(shù)字指令前先了解一下各種數(shù)據(jù)格式，關(guān)于二進(jìn)制、十進(jìn)制及其他數(shù)的表示方法，在其他地方都有介紹，這里就不再重復(fù)。
一、數(shù)據(jù)格式（16位）：數(shù)據(jù)類型INT是整數(shù)（16位），其中符號(hào)（位15）表示是正數(shù)或是負(fù)數(shù)（“0"=正數(shù)，“1"=負(fù)數(shù)），16位整數(shù)的數(shù)值范圍是-32768~+32767。在二進(jìn)制格式中，整數(shù)的負(fù)數(shù)形式用正數(shù)的二進(jìn)制補(bǔ)碼表示。（二進(jìn)制補(bǔ)碼利用取反加1得到） 負(fù)數(shù)的位格式，對(duì)零的位置加權(quán)求和，再加1，然后在前面放一個(gè)負(fù)號(hào)。
BCD碼：十進(jìn)制的每一位用四個(gè)二進(jìn)制數(shù)表示，因?yàn)閦ui大為9，所以需要四位二進(jìn)制才能表示出來（十進(jìn)制的9=1001二進(jìn)制），要注意，從0~9的十進(jìn)制數(shù)的BCD碼表示與二進(jìn)制數(shù)表示相同，但BCD碼一般用作顯示，并非二進(jìn)制。上面的INT（整數(shù)）主要是用來運(yùn)算。
如BCD碼W#16#296，在CPU中表現(xiàn)為0000，0010，1001，0110（直接為+，2，9，6=+296）；而整數(shù)+296則表示為0000，0001，0010，1000（即28+25+23=296），再例如整數(shù)-413表示為1111，1110，0110，0011（因?yàn)槭秦?fù)數(shù)，所以用補(bǔ)碼，取反加1，所以上面的二進(jìn)制數(shù)=-（28+27+24+23+22+1）=“-413"，而在BCD碼該數(shù)（W#16#F413）則可以簡單的表示為1111，0100，0001，0011。
二、數(shù)據(jù)格式（32位）：DINT類型的數(shù)據(jù)——帶符號(hào)位的32-位整數(shù)，定義為“雙整數(shù)"或“長整數(shù)"，它的表示方法及范圍是：L#-2147483648~L#+2147483647；還有一個(gè)是實(shí)數(shù)型REAL型（也叫浮點(diǎn)數(shù)），是1.175495*10-38~3402823*1038之間，實(shí)數(shù)的通用格式為（Sign）*（1.f）*（2e-127），其中Sign為符號(hào)位第31位（即zui高位），低位的0~22位為f=底數(shù)位，23~30為e=指數(shù)。STEP 7中的實(shí)數(shù)是按照IEEE標(biāo)準(zhǔn)表示的。

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