610
7 APPLICATION INSTRUCTIONS
7.12 Special Function Instructions
Arc cosine operation on floating-point data (single precision)
ACOS(P)
*1 Applicable for the Universal model QCPU, LCPU.
• Returns the COS
-1
angle of the COS value designated by (S), and stores operation results at word device designated by
(D).
• The COS value designated by (S) can be in the range of from -1.0 to 1.0.
• The angle (operation result) stored at (D) is stored in radian units. For more information on the conversion between radian
and angle data, see description of RAD and DEG instructions.
• When an input value is set using a programming tool, a rounding error may occur. For precautions, refer to Page 89
Precautions.
• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.
*2 There are CPU modules that will not result in an operation error if -0 is specified. For details, refer to Page 87 Using single/double-
precision real number data.
(S): COS value of which the COS
-1
(inverse cosine) value is obtained or head number of the devices where the COS value is stored (real number)
(D): Head number of the devices where the operation result will be stored (real number)
Setting
data
Internal device R, ZR J\ U\G Zn Constant
E
Others
Bit Word Bit Word
(S)
*1
(D)
*1
Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
4100 The value specified in (S) is not within the range between -1.0 and 1.0.
The specified device value is -0.
*2
4140 The specified device value is not within the following range:
0, 2
-126
| Specified device value | <2
128
The specified device value is -0, unnormalized number, nonnumeric, and .
4141 The operation result exceeds the following range.
(when an overflow occurs)
|Operation result| < 2
128
Process
High
performance
Redundant
Universal
LCPU
Basic
Command
Command
ACOSP
ACOS
ACOSP
ACOS S D
S D
+1
+1
S
D
S
D
COS
-1
32-bit floating-point
real number
)
32-bit floating-point
real number
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