功能指令有连续执行和脉冲执行两种类型。如图1所示,指令助记符MOV后面有“P”表示脉冲执行,即该指令仅在X1接通(由OFF到ON)时执行(将D10中的数据送到D12中)一次;如果没有“P”则表示连续执行,即该在X1接通(ON)的每一个扫描周期指令都要被执行。
图1 功能指令的执行方式与数据长度的表示
2.数据长度
功能指令可处理16位数据或32位数据。处理32位数据的指令是在助记符前加“D”标志,无此标志即为处理16位数据的指令。注意32位计数器(C200~C255)的一个软元件为32位,不可作为处理16位数据指令的操作数使用。如图3-27所示,若MOV指令前面带“D”,则当X1接通时,执行D11D10→D13D12(32位)。在使用32位数据时建议使用首编号为偶数的操作数,不容易出错。
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1756-IV16
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1756-L61RMCN1
1756-L61RMEN1
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3HAC020428-006
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3HAC020464-001
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3HAC020500-001
3HAC020505-003
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P0970BC-DNBI
P0971WV-DNBT
P0960AW-CP30
P0960JA-CP40
P0961FR-CP60
P0400DA FBM01
P0400YC FBM02
P0400YD FBM03
P0400YE FBM04
P0400YF FBM05
P0400YG FBM06
P0400YH FBM07
P0400YJ FBM08
P0400YK FBM09
P0400YL FBM10
P0400YM FBM11
P0400YN FBM12
P0400YP FBM13
P0400YQ FBM14
P0400YR FBM15
P0400YS FBM16
P0400YT FBM17
P0400YV FBM18
P0700QV FBM20
P0700TW FBM21
P0900HS FBM22
P0900HT FBM24
P0900NX FBM25
P0900HU FBM26
P0900NY FBM27
P0912MJ FBM33
P0902XA FBM41
P0902XB FBM42
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