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FX3G/FX3U/FX3UC 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 radians (from −π/2 to +π/2).
For conversion between radians and degrees, 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
XYMTCSD.b KnX KnY KnM KnS T C D R U\G VZModifyKH E ""P
33 3 3 3
33 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