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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.22 FNC134 – ACOS / Floating Point Arc Cosine
18.22 FNC134 – ACOS / Floating Point Arc Cosine
Outline
This instruction executes COS
−1
(arc cosine) 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 (DACOS and DACOSP)
An angle is obtained from the cosine value stored in [ +1, ], and stored to [ +1, ].
A real number can be directly specified as .
• The cosine value stored in [ +1, ] can be set ranging from −1.0 to +1.0.
• The angle (operation result) stored in [ +1, ] is expressed in radians (from 0 to π).
For conversion between radians and degrees, refer to the RAD (FNC136) and DEG (FNC137) instructions.
→ For the RAD (FNC136) instruction, refer to Section 18.24.
→ For the DEG (FNC137) instruction, refer to Section 18.25.
Error
An operation error is caused in the following case; The error flag M8067 turns ON, and the error code is stored in
D8067.
• When a value specified in is outside the range from −1.0 to +1.0 (error code: K6706)
Operand Type Description Data Type
Head device number storing a cosine value used in COS
−1
(arc cosine) 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 V Z Modify K H E ""P
−
−
Mnemonic Operation Condition
16-bit Instruction
DACOS
DACOSP
Mnemonic Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Operation
P
FNC 134
ACOS
D
S
D
S
D
S
S
D
D
S
Command
input
FNC134
DACOS
S
D
+1
Binary floating point
(real number)
+1
Binary floating point
(real number)
COS
−
1
S
S
D
D
S
S
D
D
S