479
Floating-point Math Instructions Section 3-14
Applicable Program Areas
Operand Specifications
Description FIX(450) converts the integer portion of the 32-bit floating-point number in
S+1 and S (IEEE754-format) to 16-bit signed binary data and places the
result in R.
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 R
CIO Area CIO 0 to CIO 6142 CIO 0 to CIO 6143
Work Area W0 to W510 W0 to W511
Holding Bit Area H0 to H510 H0 to H511
Auxiliary Bit Area A0 to A958 A448 to A959
Timer Area T0000 to T4094 T0000 to T4095
Counter Area C0000 to C4094 C0000 to C4095
DM Area D0 to D32766 D0 to D32767
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants #00000000 to #FFFFFFFF
(binary)
---
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+1 S
R
Floating-point data (32 bits)
Signed binary data (16 bits)
Name Label Operation
Error Flag ER ON if the data in S+1 and S is not a number (NaN).
ON if the integer portion of S+1 and S 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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