500
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
18.22 FNC134 – ACOS / Floating Point Arc Cosine
Outline
This instruction executes the 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 within the range from
−
1.0 to +1.0.
• The angle (operation result) stored in [
+1,
] is expressed in radian (from 0 to
π
).
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.
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 the 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