ATAN2_YX_LREAL使用LREAL参数返回笛卡尔坐标（x，y）的角度φ
ATAN2_YX_LREAL在-p到+p的范围内返回笛卡尔坐标 (x，y) 的角度j。
输入
笛卡尔y坐标
笛卡尔x坐标
输出
二维坐标的各个位置P可以由笛卡尔坐标P(x,y)或极坐标P(r,j)（r =半径，j =角度）定义。
如下定义ATAN2_YX：
ATAN2_YX(y,x) |
x |
y |
|---|---|---|
 |
x > 0 |
|
 |
x < 0 |
y ³ 0 |
 |
y < 0 |
|
 |
x = 0 |
y > 0 |
 |
y < 0 |
|
0 |
y = 0 |
相应的F型指令：F305_BATAN BCD类型反正切运算
所有用于编程此函数的输入和输出变量已在POU头中声明。 所有编程语言使用相同的POU头。
VAR
rPhi1Rad: REAL:=0.0;
rPhi2Rad: REAL:=0.0;
rPhi1Degree: REAL:=0.0;
rPhi2Degree: REAL:=0.0;
END_VAR VAR CONSTANT
DEGR_OF_RAD: REAL:=57.295779513082320876798154814105;
END_VAR
VAR
bCalculatePhi1: BOOL:=FALSE;
END_VAR
BODY
WORKSPACE
NETWORK_LIST_TYPE := NWTYPELD ;
END_WORKSPACE
NET_WORK
NETWORK_TYPE := NWTYPELD ;
NETWORK_LABEL := ;
NETWORK_TITLE := ;
NETWORK_HEIGHT := 3 ;
NETWORK_BODY
B(B_COMMENT,,Calculate the angle values of point in quadrant 2,3,1,32,2,);
L(1,0,1,3);
END_NETWORK_BODY
END_NET_WORK
NET_WORK
NETWORK_TYPE := NWTYPELD ;
NETWORK_LABEL := ;
NETWORK_TITLE := ;
NETWORK_HEIGHT := 5 ;
NETWORK_BODY
B(B_COMMENT,,Result: 2.356194490192345,42,1,55,2,);
B(B_CONTACT,,bCalculate,9,1,11,3,);
B(B_F,E_ATAN2_YX_LREAL!,,26,0,36,5,,?DEN?Dy?Dx?AENO?C);
B(B_VARIN,,10,24,2,26,4,);
B(B_VAROUT,,lrPhi1_rad,36,2,38,4,);
B(B_VARIN,,-10,24,3,26,5,);
L(1,0,1,5);
L(1,2,9,2);
L(11,2,26,2);
END_NETWORK_BODY
END_NET_WORK
NET_WORK
NETWORK_TYPE := NWTYPELD ;
NETWORK_LABEL := ;
NETWORK_TITLE := ;
NETWORK_HEIGHT := 4 ;
NETWORK_BODY
B(B_COMMENT,,Result: 135.0,42,1,55,2,);
B(B_CONTACT,,bCalculate,9,1,11,3,);
B(B_F,FP_DEG!,,26,0,32,4,,?DEN?D@'s'?AENO?Cd);
B(B_VARIN,,lrPhi1_rad,24,2,26,4,);
B(B_VAROUT,,lrPhi1_degree,32,2,34,4,);
L(1,0,1,4);
L(1,2,9,2);
L(11,2,26,2);
END_NETWORK_BODY
END_NET_WORK
NET_WORK
NETWORK_TYPE := NWTYPELD ;
NETWORK_LABEL := ;
NETWORK_TITLE := ;
NETWORK_HEIGHT := 3 ;
NETWORK_BODY
B(B_COMMENT,,Calculate the angle values of point in quadrant 4,3,1,32,2,);
L(1,0,1,3);
END_NETWORK_BODY
END_NET_WORK
NET_WORK
NETWORK_TYPE := NWTYPELD ;
NETWORK_LABEL := ;
NETWORK_TITLE := ;
NETWORK_HEIGHT := 5 ;
NETWORK_BODY
B(B_COMMENT,,Result: -0.7853981633974483,42,1,55,2,);
B(B_CONTACT,,bCalculate,9,1,11,3,);
B(B_F,E_ATAN2_YX_LREAL!,,26,0,36,5,,?DEN?Dy?Dx?AENO?C);
B(B_VARIN,,-5,24,2,26,4,);
B(B_VAROUT,,lrPhi2_rad,36,2,38,4,);
B(B_VARIN,,5,24,3,26,5,);
L(1,0,1,5);
L(1,2,9,2);
L(11,2,26,2);
END_NETWORK_BODY
END_NET_WORK
NET_WORK
NETWORK_TYPE := NWTYPELD ;
NETWORK_LABEL := ;
NETWORK_TITLE := ;
NETWORK_HEIGHT := 4 ;
NETWORK_BODY
B(B_COMMENT,,Result: -45.0,42,1,55,2,);
B(B_CONTACT,,bCalculate,9,1,11,3,);
B(B_F,FP_DEG!,,26,0,32,4,,?DEN?D@'s'?AENO?Cd);
B(B_VARIN,,lrPhi2_rad,24,2,26,4,);
B(B_VAROUT,,lrPhi2_degree,32,2,34,4,);
L(1,0,1,4);
L(1,2,9,2);
L(11,2,26,2);
END_NETWORK_BODY
END_NET_WORK
END_BODY
//Calculate the angle values of point in quadrant 2
if (bCalculate) then
lrPhi1_rad := ATAN2_YX_LREAL(y := 10.0, x := -10.0); // Result: 2.356194490192345
FP_DEG(s := lrPhi1_rad, d => lrPhi1_degree); // Result: 135.0
end_if;
//Angle value of point in quadrant 4
if (bCalculate) then
lrPhi2_rad := ATAN2_YX_LREAL(y := -5.0, x := 5.0); // Result: -0.7853981633974483
FP_DEG(s := lrPhi2_rad, d => lrPhi2_degree); // Result: -45.0
end_if;