525
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.22 FNC134 – ACOS / Floating Point Arc Cosine
11
FN
C30
-FN
C3
9
R
ota
tion and
Shi
ft
12
FN
C40-FN
C49
D
ata O
perati
on
13
FNC
50-FNC
59
High-Speed
Proc
essing
14
FM
C60-FN
C69
H
andy
In
struction
15
FN
C70-FN
C79
E
xternal
F
X
I/O
De
vice
16
FNC
80-FNC
89
External
FX
Dev
ice
17
FNC1
00-
FNC10
9
Dat
a
Transfer 2
18
FNC1
10-
FNC139
Fl
oa
ting Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
Operation 2
20
FNC1
50-
FNC159
Pos
itioning
Control
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
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
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
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