534
Double-precision Floating-point Instructions Section 3-15
Description DBL(843) converts the 16-bit signed binary value in S to double-precision (64-
bit) floating-point data (IEEE754-format) and places the result in words D to
D+3. A single 0 is added after the decimal point in the floating-point result.
Only values within the range of –32,768 to 32,767 can be specified for S. To
convert signed binary data outside of that range, use DBLL(844).
Example conversions:
A signed binary value of 3 is converted to 3.0.
A signed binary value of –3 is converted to –3.0.
Flags
Precautions The content of S must contain signed binary data with a (decimal) value in the
range of –32,768 to 32,767.
3-15-4 32-BIT TO DOUBLE FLOATING: DBLL(844)
Purpose Converts a 32-bit signed binary value to double-precision (64-bit) floating-
point data and places the result in the specified destination words.
Ladder Symbol
Variations
Applicable Program Areas
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area S D
D+1
S
DD+2D+3
Signed binary data (16 bits)
Floating-point data (64 bits)
Name Label Operation
Error Flag ER OFF
Equals Flag = ON if both the exponent and mantissa of the result are 0.
OFF in all other cases.
Negative Flag N ON if the result is negative.
OFF in all other cases.
DBLL(844)
S
D
S: First source word
D: First destination word
Variations Executed Each Cycle for ON Condition DBLL(844)
Executed Once for Upward Differentiation @DBLL(844)
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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