558
Double-precision Floating-point Instructions Section 3-15
The following diagram shows the relationship between the input data and
result.
Flags
Precautions The source data in words S to S+3 must be in IEEE754 floating-point data for-
mat.
3-15-18 DOUBLE EXPONENT: EXPD(858)
Purpose Calculates the natural (base e) exponential of a double-precision (64-bit) float-
ing-point number and places the result in the specified result words.
Ladder Symbol
Variations
Applicable Program Areas
R
S: Input data
R: Result
Name Label Operation
Error Flag ER ON if the source data is not recognized as floating-point
data.
ON if the source data is negative.
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 ON if the absolute value of the result is too large to be
expressed as a double-precision (64-bit) floating-point
value.
Underflow Flag UF Unchanged
Negative Flag N Unchanged
EXPD(858)
S
D
S: First source word
D: First destination word
Variations Executed Each Cycle for ON Condition EXPD(858)
Executed Once for Upward Differentiation @EXPD(858)
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
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