Arc Tangent: Atan - Omron CQM1H - PROGRAM Programming Manual

Floating-point Math Instructions
Flags
5-24-16 ARC TANGENT: ATAN(––)
Limitations
–1
COS S+1
R+1
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.
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.
Ladder Symbols
ATAN(−−) @ATAN(−−)
S
R
000
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.
Source (32-bit floating-point data)
S
Result (32-bit floating-point data)
R
S: Input data (cosine value)
R
R: Result (radians)
IR, SR, AR, DM, EM, HR, TIM/CNT, LR
S
IR, SR, AR, DM, EM, HR, LR
R
Third operand: Always 000
000
Section 5-24
Operand Data Areas
S: First source word
R: First result word
−−−
367