667
Double-precision Floating-point Instructions (CS1-H, CJ1-H, CJ1M, or CS1D Only) Section 3-16
Flags
Precautions The Minuend (Mi to Mi+3) and Subtrahend (Su to Su+3) data must be in
IEEE754 floating-point data format.
3-16-7 DOUBLE FLOATING-POINT MULTIPLY: *D(847)
Purpose Multiplies two double-precision (64-bit) floating-point numbers and places the
result in the specified result words.
This instruction is supported by CS1-H, CJ1-H, CJ1M, and CS1D CPU Units
only.
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
Name Label Operation
Error Flag ER ON if the minuend or subtrahend data is not recognized
as floating-point data.
ON if the minuend or subtrahend is not a number (NaN).
ON if +∞ is subtracted from +∞.
ON if –∞ is subtracted from –∞.
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 floating-point value.
Underflow Flag UF ON if the absolute value of the result is too small to be
expressed as a double-precision floating-point value.
Negative Flag N ON if the result is negative.
OFF in all other cases.
*D(847)
D
Md
Mr
Md: First Multiplicand word
Mr: First Multiplier word
D: First destination word
Variations Executed Each Cycle for ON Condition *D(847)
Executed Once for Upward Differentiation @*D(847)
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 Md Mr D
CIO Area CIO 0000 to CIO 6140
Work Area W000 to W508
Holding Bit Area H000 to H508
Auxiliary Bit Area A000 to A956 A448 to A956
Timer Area T0000 to T4092
Counter Area C0000 to C4092
DM Area D00000 to D32764
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