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CP5611-A2
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6SE7022-6ES87-1FE0
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MMC21-14IO8B
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6RA7081-6DV62-0
6RA7081-6DV62-0
6RA7081-6DV62-0
西門(mén)子PLC除基本邏輯運(yùn)算指令、定時(shí)、計(jì)數(shù)等常用的開(kāi)關(guān)量控制指令外，還包括大量的用于字節(jié)、字、雙字邏輯處理，數(shù)學(xué)運(yùn)算，程序控制，通信等指令。這些指令可以為用戶(hù)的PLC功能開(kāi)發(fā)、編程、使用提供方便，因此，習(xí)慣上將其稱(chēng)為功能指令。
一個(gè)PLC可以使用的功能指令數(shù)量有所不同，從某種程度上說(shuō)，功能指令反映了CPU功能的強(qiáng)弱。為了分別說(shuō)明，本書(shū)對(duì)S7系列PLC的功能指令作了如下分類(lèi)與定義：
(1)字節(jié)、字、雙字邏輯處理指令
字節(jié)、字、雙字邏輯處理指令是指以字節(jié)、字或雙字的形式進(jìn)行的邏輯運(yùn)算與處理，包括字節(jié)、字或雙字的“與”、“或”、“異或”、“取反”運(yùn)算等。
(2)比較指令
比較指令是對(duì)兩個(gè)存儲(chǔ)器內(nèi)容或數(shù)據(jù)的比較，通常以字節(jié)、字或雙字的形式進(jìn)行。比較方式可以是“大于”、“小于”、“等于”、“大于等于”、“小于等于”、“不等于”等，比較結(jié)果將以二進(jìn)制位的形式輸出。
(3)裝載、傳送與移動(dòng)指令
裝載、傳送與移動(dòng)指令用于存儲(chǔ)器間的內(nèi)容交換，通常以字節(jié)、字或雙字的形式進(jìn)行。在本書(shū)中，對(duì)裝載、傳送與移動(dòng)的定義如下：
裝載：是指將存儲(chǔ)器的內(nèi)容或者特定的數(shù)據(jù)讀入到累加器或地址寄存器中；
傳送：是指將累加器或地址寄存器的內(nèi)容移動(dòng)到指定的存儲(chǔ)器中；
移動(dòng)：是指將某一存儲(chǔ)器的內(nèi)容或特定的數(shù)據(jù)移動(dòng)到另一存儲(chǔ)器中。
(4)移位指令
移位指令是對(duì)存儲(chǔ)器本身內(nèi)容所進(jìn)行的調(diào)整，通常以字節(jié)、字或雙字的形式進(jìn)行。移位指令有左移、右移、循環(huán)移動(dòng)等形式。
(5)代碼轉(zhuǎn)換指令
代碼轉(zhuǎn)換指令是指將一個(gè)存儲(chǔ)器的存儲(chǔ)內(nèi)容以其他代碼的形式存儲(chǔ)到指定儲(chǔ)器中的操作，通常以字節(jié)、字或雙字的形式進(jìn)行。常見(jiàn)的代碼轉(zhuǎn)換有二進(jìn)制與BCD碼間的轉(zhuǎn)換、ASCII碼與二進(jìn)制數(shù)間的轉(zhuǎn)換等。
(6)數(shù)學(xué)運(yùn)算指令
代碼轉(zhuǎn)換指令是指將兩個(gè)存儲(chǔ)器間的內(nèi)容進(jìn)行四則運(yùn)算、函數(shù)運(yùn)算、增減“l(fā)”等處理后，移動(dòng)到指定存儲(chǔ)器中的操作，通常以字節(jié)、字或雙字的形式進(jìn)行。常見(jiàn)的代碼轉(zhuǎn)換有二進(jìn)制與BCD碼間的轉(zhuǎn)換、ASCII碼與二進(jìn)制數(shù)間的轉(zhuǎn)換等。
(7)程序控制指令
程序控制指令是指改變PLC內(nèi)部指令的執(zhí)行過(guò)程或PLC運(yùn)行狀態(tài)的操作。常見(jiàn)的有程序結(jié)束、程序跳轉(zhuǎn)、程序中斷、程序停止等。
(8)通信指令
程序控制指令是指用于控制PLC與外部設(shè)備間數(shù)據(jù)交換（通信）的指令。常見(jiàn)的有數(shù)據(jù)發(fā)送、數(shù)據(jù)接收等
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