中型PLC常用ST指令_算术运算

<p style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; orphans: 3; widows: 3; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255); margin-top: 0px !important;">算术运算符就是我们数学上的加减乘除，这里呢拿出来简单讲一下。会小学数学，就肯定会PLC编程中的加减乘除！</p><h3 style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; position: relative; font-size: 1.5em; orphans: 3; widows: 3; break-after: avoid; margin-top: 1.275em; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">加法 +</h3><p style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; orphans: 3; widows: 3; margin-top: 0px; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">在ST语法中，加法就是&quot;+&quot;数学上的加法符号。假如已知变量: vi_VarA := 10; vi_VarB := 90; 则：vi_Num := vi_VarA + vi_VarB; 经过运算，vi_Num输出值为 100；</p><h3 style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; position: relative; font-size: 1.5em; orphans: 3; widows: 3; break-after: avoid; margin-top: 1.275em; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">减法 -</h3><p style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; orphans: 3; widows: 3; margin-top: 0px; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">在ST语法中，减法就是“-”数学上的减号。假如已知变量： vi_VarA := 10; vi_VarB := 90; 则：vi_Num := vi_VarA - vi_VarB; 经过运算，vi_Num输出值为 -80；</p><h3 style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; position: relative; font-size: 1.5em; orphans: 3; widows: 3; break-after: avoid; margin-top: 1.275em; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">乘法 *</h3><p style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; orphans: 3; widows: 3; margin-top: 0px; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">在ST语法中，乘法就是“<em style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; font-size: inherit;">”星号。假如已知变量： //-----乘法的运用---------------------------- vf_圆周率 := 3.1415926; vi_半径 := 8; //----8mm vf_圆面积 := vf_圆周率&nbsp;</em>INT<em style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; font-size: inherit;">TO_REAL(vi</em>半径 * vi_半径); 运算结果就是半径为8mm的圆面积。</p><h3 style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; position: relative; font-size: 1.5em; orphans: 3; widows: 3; break-after: avoid; margin-top: 1.275em; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">除法 /</h3><p style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; orphans: 3; widows: 3; margin-top: 0px; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">ST语法中的除法就是&quot;/&quot; //-----已知 vf<em style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; font-size: inherit;">圆周长 := 15mm,求直径.-------- vf\</em>圆周长 := 15; vf_直径 := vf<em style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; font-size: inherit;">圆周长 / vf</em>圆周率;</p><h3 style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; position: relative; font-size: 1.5em; orphans: 3; widows: 3; break-after: avoid; margin-top: 1.275em; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">变量区代码：</h3><pre style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; font-family: Consolas, &quot;Liberation Mono&quot;, Menlo, Courier, monospace; text-wrap: wrap; break-inside: avoid; direction: ltr; margin-top: 0px; margin-bottom: 1.275em; padding: 0.85em 1em; border: none; color: rgb(51, 51, 51); overflow: auto; overflow-wrap: normal; background-color: rgb(247, 247, 247); letter-spacing: 0.2px;">PROGRAM&nbsp;PLC_PRG
VAR
&nbsp;&nbsp;&nbsp;&nbsp;vi_VarA&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;INT;
&nbsp;&nbsp;&nbsp;&nbsp;vi_VarB&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;INT;
&nbsp;&nbsp;&nbsp;&nbsp;vi_Var1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;INT;
&nbsp;&nbsp;&nbsp;&nbsp;vi_Var2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;INT;

&nbsp;&nbsp;&nbsp;&nbsp;vf_圆周率&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;REAL;
&nbsp;&nbsp;&nbsp;&nbsp;vi_半径&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;INT;&nbsp;&nbsp;&nbsp;&nbsp;//mm
&nbsp;&nbsp;&nbsp;&nbsp;vf_圆面积&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;REAL;&nbsp;&nbsp;&nbsp;&nbsp;//mm^2
&nbsp;&nbsp;&nbsp;&nbsp;vf_圆周长&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;REAL;&nbsp;//mm
&nbsp;&nbsp;&nbsp;&nbsp;vf_直径:&nbsp;REAL;
END_VAR</pre><h3 style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; position: relative; font-size: 1.5em; orphans: 3; widows: 3; break-after: avoid; margin-top: 1.275em; margin-bottom: 0.85em; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; letter-spacing: 0.2px; text-wrap: wrap; background-color: rgb(255, 255, 255);">程序段代码：</h3><pre style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; text-size-adjust: none; -webkit-font-smoothing: antialiased; font-family: Consolas, &quot;Liberation Mono&quot;, Menlo, Courier, monospace; text-wrap: wrap; break-inside: avoid; direction: ltr; margin-top: 0px; margin-bottom: 1.275em; padding: 0.85em 1em; border: none; color: rgb(51, 51, 51); overflow: auto; overflow-wrap: normal; background-color: rgb(247, 247, 247); letter-spacing: 0.2px;">vi_VarA&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;10;
vi_VarB&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;90;

//-----加法指令的运用，运算结果100-----------
vi_Var1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;vi_VarA&nbsp;+&nbsp;vi_VarB;

//-----减法指令的运用，运算结果-80-----------
vi_Var2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;vi_VarA&nbsp;-&nbsp;vi_VarB;

//-----乘法的运用----------------------------
vf_圆周率&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;3.1415926;
vi_半径&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;8;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//----8mm

vf_圆面积&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;vf_圆周率&nbsp;*&nbsp;INT_TO_REAL(vi_半径&nbsp;*&nbsp;vi_半径);

//-----除法的应用----------------------------
//-----已知&nbsp;vf_圆周长&nbsp;:=&nbsp;15mm,求直径.--------
vf_圆周长&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;15;
vf_直径&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:=&nbsp;vf_圆周长&nbsp;/&nbsp;vf_圆周率;</pre><p><br/></p>