Mitsubishi MELSEC Q Series, Programming Manual

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7.12 Special Function Instructions
7.12.6 TAN operation on floating-point data (double precision)
7-239
7
APPLI
C
A
T
IO
N
INSTRUCTIONS
TA
N
D
TAND
O peration Error
(1) 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 data is not within the following range.
(Error code: 4140)
0, 2
-1022
| value of the specified data | < 2
1024
• The value of the specified data is 0. (Error code: 4140)
• The operation result exceeds the following range. (An overflow occurs.)
2
1024
| operation result | (Error code: 4141)
Program Example
(1) In the following program, the tangent function is evaluated on the angle set in BCD 4 digits in
the devices from X20 to X2F, and the result is stored to Var_D0 as a 64-bit floating-point real
number.
[Structured ladder]
[ST]
IF SM400 THEN
BIN(TRUE,K4X20,Var_D30);
FLTD(TRUE,Var_D30,Var_D20);
RADD(TRUE,Var_D20,Var_D10);
TAND(TRUE,Var_D10,Var_D0);
END_IF;
[Operation example when the value of 135 is specified for X20 to X2F]
I nputs the ang l e d ata on wh i ch the tangent funct i on i s
eva l uate d. ( )
Converts the i nput ang l e d ata to 6 4- b i t f l oat i ng - po i nt rea l
number d ata . ( )
Converts d egrees to ra di ans . ( )
T angent operat i on on the converte d ang l e d ata i n
ra di ans . ( )
1
2
3
4
6 4- b i t f l oat i ng - po i nt
rea l number
T A N operat i on
4
Ra di an convers i on
3
6 4- b i t f l oat i ng - po i nt
rea l number
Var _ D10 Var _ D0
6 4- b i t f l oat i ng - po i nt
rea l number
Var _ D20
Var _ D30
b15 --- b0
T A N D
Fl oat i ng - po i nt convers i on 2
FLT D
B IN convers i on 1
B IN
RADD
2 . 35619 4 - 1 . 000000
135
135
BCD va l ue
X2 F --- X20
0 1 3 5
BCD va l ue