502
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.23 FNC135 – ATAN / Floating Point Arc Tangent
18.23 FNC135 – ATAN / Floating Point Arc Tangent
Outline
This instruction executes the TAN
−
1
(arc tangent) operation.
→
For handling of floating point, refer to Subsection 5.1.3.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 32-bit operation (DATAN and DATANP)
An angle is obtained from the tangent value stored in [
+1,
], and stored to [
+1,
].
A real number can be directly specified as
.
• The angle (operation result) stored in [
+1,
] is expressed in radian (from
−π
/2 to +
π
/2).
For conversion between radian and degree, refer to RAD (FNC136) and DEG (FNC137) instructions.
→
For RAD (FNC136) instruction, refer to Section 18.24.
→
For DEG (FNC137) instruction, refer to Section 18.25.
Operand Type
Description
Data Type
Head device number storing a tangent value used in the TAN
−
1
(arc tangent)
operation
Real number (binary)
Head device number storing the operation result
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS
T
C
D
R U
\G
V
Z Modify K
H
E
"
"
P
3 3
3
3
3
3 3
3
3
−
−
Mnemonic
Operation Condition
16-bit Instruction
DATAN
DATANP
Mnemonic
Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Operation
P
FNC 135
ATAN
D
S
D
S
D
S
S
D
D
S
Command
input
FNC135
DATAN
S
D
+1
Binary floating point
(real number)
+1
Binary floating point
(real number)
TAN
−
1
S
S
D
D
D
D