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7 APPLICATION INSTRUCTIONS

7.12 Special Function Instructions

613

Arc cosine operation on floating-point data (double precision)

ACOSD(P)

Processing details

• The angle is calculated from the COS (cosine) value specified by (S) and its result is stored into the device specified 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 RADD and DEGD instructions.

• When the operation results in -0 or an underflow, the result is processed as 0.
• When an input value is set using a programming tool, a rounding error may occur. For precautions, refer to Page 90

Precautions.

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.

(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

Constant
E

Others

Bit

Word

Bit

Word

(S)











(D)







Error
code

Error details

Q00J/
Q00/
Q01

QnH

QnPH

QnPRH QnU

LCPU

4100

The value specified by (S) is within the double-precision floating-point range
and not within the range from -1.0 and 1.0.





4140

The specified device value is not within the following range:
0, 2

-1022

 | Specified device value | <2

1024

The specified device value is -0.





4141

The operation result exceeds the following range.
(when an overflow occurs)
2

1024

 | Operation result |





Universal

LCPU

Basic

High

performance

Process

Redundant

Command

ACOSDP

ACOSD

ACOSDP

ACOSD

)

COS (

64-bit floating-point
real number