Mitsubishi MELSEC Q Series, Programming Manual

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7.12 Special Function Instructions
7.12.12 TAN
-1
operation on floating-point data (double precision)
7-253
7
APPLI
C
A
T
IO
N
INSTRUCTIONS
ATA
N
D
ATAND
O peration Error
In any of the following cases, an operation error occurs, the error flag (SM0) is turned ON, and
the corresponding error code is stored to SD0.
• The value of the specified device is not within the following range. (Error code: 4140)
0, 2
-1022
| value of the specified device | < 2
1024
• The value of the specified device is 0. (Error code: 4140)
• The operation result exceeds the following range. (An overflow occurs.)
2
1024
| operation result | (Error code: 4141)
Program Example
In the following program, the arctangent function is evaluated on the 64-bit floating-point real
number in Var_D0, and its angle is output to Y40 to Y4F in BCD 4 digits.
[Structured ladder]
[ST]
IF SM400 THEN
ATAND(TRUE,Var_D0,Var_D10);
DEGD(TRUE,Var_D10,Var_D20);
INTD(TRUE,Var_D20,Var_D30);
BCD(TRUE,Var_D30,K4Y40);
END_IF;
[Operation example when the value of 1 is set for Var_D0]
O utputs the angle d ata converte d to integer value to
the d isplay. ( )
Converts the angle d ata in 64-bit floating-point real
number to integer value. ( )
Converts ra d ians to d egrees. ( )
Evaluates the angle d ata ( in ra d ians ) by the
arctangent operation. ( )
1
2
3
4
6 4- b i t f l oat i ng - po i nt
rea l number
BCD operat i on 4
Ang l e convers i on 2
B IN convers i on 3
Var _ D20
6 4- b i t f l oat i ng - po i nt
rea l number
Var _ D10
Var _ D30
b15 --- b0
INT D
BCD
T A N
- 1
convers i on 1
A T A N D
D E GD
4 5
0 . 785398
6 4- b i t f l oat i ng - po i nt
rea l number
Var _ D0
1
4 5
B IN va l ue
Y4F --- Y4 0
0 0 4 5
BCD va l ue