367
Floating-point Math Instructions Section 5-24
The source data must be between –1.0 and 1.0. If the absolute value of the
source data exceeds 1.0, an error will occur and the instruction won’t be exe-
cuted.
The result is output to words R+1 and R as an angle (in radians) within the
range of 0 to
π.
The following diagram shows the relationship between the input data and
result.
Flags ER: Indirectly addressed EM/DM word is non-existent.
(Content of *EM/*DM word is not BCD, or the EM/DM area boundary
has been exceeded.)
ON if the source data is not recognized as floating-point data.
ON if the absolute value of the source data exceeds 1.0.
EQ: ON if both the exponent and mantissa of the result are 0.
5-24-16 ARC TANGENT: ATAN(––)
Limitations The source data in S+1 and S must be in IEEE754 floating-point data format.
DM 6143 to DM 6655 cannot be used for R.
R+1 R
S
Source (32-bit floating-point data)
S+1
Result (32-bit floating-point data)
COS
–1
S: Input data (cosine value)
R: Result (radians)
R
S: First source word
IR, SR, AR, DM, EM, HR, TIM/CNT, LR
R: First result word
IR, SR, AR, DM, EM, HR, LR
Ladder Symbols
Operand Data Areas
Third operand: Always 000
−−−
ATAN(−− )
S
R
000
@ ATA N( −−)
S
R
000
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