Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 - Page 668

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Floating-point Math Instructions Section 3-15
Description ATAN(465) computes the angle (in radians) for a tangent value expressed as
a 32-bit floating-point number in S+1 and S and places the result in R+1 and
R.
(The floating point source data must be in IEEE754 format.)
The result is output to words R+1 and R as an angle (in radians) within the
range of –
π/2 to π/2.
The following diagram shows the relationship between the input data and
result.
Flags
Precautions The source data in S+1 and S must be in IEEE754 floating-point data format.
R+1 R
S
S+1
TA N
–1
Source (32-bit floating-point data)
Result (32-bit floating-point data)
R
S: Input data (tangent)
R: Result (radians)
Name Label Operation
Error Flag ER ON if the source data is not recognized as floating-point
data.
ON if the source data is not a number (NaN).
OFF in all other cases.
Equals Flag = ON if both the exponent and mantissa of the result are 0.
OFF in all other cases.
Overflow Flag OF OFF
Underflow Flag UF OFF
Negative Flag N ON if the result is negative.
OFF in all other cases.