531
Double-precision Floating-point Instructions Section 3-15
Applicable Program Areas
Operand Specifications
Description FIXD(841) converts the integer portion of the double-precision (64-bit) float-
ing-point number in words S to S+3 (IEEE754-format) to 16-bit signed binary
data and places the result in D.
Only the integer portion of the floating-point data is converted, and the fraction
portion is truncated. The integer portion of the floating-point data must be
within the range of –32,768 to 32,767.
Example conversions:
A floating-point value of 3.5 is converted to 3.
A floating-point value of –3.5 is converted to –3.
Flags
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
Area S D
CIO Area CIO 0 to CIO 6140 CIO 0 to CIO 6143
Work Area W0 to W508 W0 to W511
Holding Bit Area H0 to H508 H0 to H511
Auxiliary Bit Area A0 to A956 A448 to A959
Timer Area T0000 to T4092 T0000 to T4095
Counter Area C0000 to C4092 C0000 to C4095
DM Area D0 to D32764 D0 to D32767
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants ---
Data Registers --- DR0 to DR15
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
S+3 S
D
S+1S+2
Floating-point data (64 bits)
Signed binary data (16 bits)
Name Label Operation
Error Flag ER ON if the source data (S to S+3) is not a number (NaN).
ON if the integer portion of the source data (S to S+3) is
not within the range of –32,768 to 32,767.
OFF in all other cases.
Equals Flag = ON if the result is 0000.
OFF in all other cases.
Negative Flag N ON if bit 15 of the result is ON.
OFF in all other cases.
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