555
Double-precision Floating-point Instructions Section 3-15
Flags
Precautions The source data in words S to S+3 must be in IEEE754 floating-point data for-
mat.
3-15-16 DOUBLE ARC TANGENT: ATAND(856)
Purpose Calculates the arc tangent of a double-precision (64-bit) floating-point number
and places the result in the specified result words. (The arc tangent function is
the inverse of the tangent function; it returns the angle that produces a given
tangent value.)
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
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).
ON if the absolute value of the source data exceeds 1.0.
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 Unchanged
Underflow Flag UF Unchanged
Negative Flag N Unchanged
ATAND(856)
S
D
S: First source word
D: First destination word
Variations Executed Each Cycle for ON Condition ATAND(856)
Executed Once for Upward Differentiation @ATAND(856)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
Area S D
CIO Area CIO 0 to CIO 6140
Work Area W0 to W508
Holding Bit Area H0 to H508
Auxiliary Bit Area A0 to A956 A448 to A956
Timer Area T0000 to T4092
Counter Area C0000 to C4092
DM Area D0 to D32764
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants ---
Data Registers ---
To Next Page
Loading...
