486
Floating-point Math Instructions Section 3-14
Precautions The augend (Au+1 and Au) and Addend (Ad+1 and Ad) data must be in
IEEE754 floating-point data format.
3-14-6 FLOATING-POINT SUBTRACT: –F(455)
Purpose Subtracts one 32-bit floating-point number from another and places the result
in the specified result words.
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
Overflow Flag OF ON if the absolute value of the result is too large to be
expressed as a 32-bit floating-point value.
Underflow Flag UF ON if the absolute value of the result is too small to be
expressed as a 32-bit floating-point value.
Negative Flag N ON if the result is negative.
OFF in all other cases.
Name Label Operation
–F(455)
R
Mi
Su
Mi: First Minuend word
Su: First Subtrahend word
R: First result word
Variations Executed Each Cycle for ON Condition –F(455)
Executed Once for Upward Differentiation @–F(455)
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 Mi Su R
CIO Area CIO 0 to CIO 6142
Work Area W0 to W510
Holding Bit Area H0 to H510
Auxiliary Bit Area A0 to A958 A448 to A958
Timer Area T0000 to T4094
Counter Area C0000 to C4094
DM Area D0 to D32766
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants #00000000 to #FFFFFFFF (binary) ---
Data Registers ---
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