Mitsubishi MELSEC iQ-F FX5 series, Programming Manual, Page: 418 / 888

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7 APPLICATION INSTRUCTION
7.7 Real Number Instruction
Subtracting single-precision real numbers
DESUB(P)
These instructions subtract the single-precision real number in the device specified by (s2) from the single-precision real
number in the device specified by (s1), and store the result in the device specified by (d).
Setting data
■
Descriptions, ranges, and data types
■
Applicable devices
Processing details
• These instructions subtract the single-precision real number in the device specified by (s2) from the single-precision real
number in the device specified by (s1), and store the result in the device specified by (d).
• When the constant (K or H) is specified in (s1) and (s2), these instructions convert values into single-precision real number
automatically.
• The table below shows the related devices.
Ladder diagram Structured text
ENO:=DSUB(EN,s1,s2,d);
ENO:=DSUBP(EN,s1,s2,d);
Operand Description Range Data type Data type (label)
(s1) Minuend data or head device number where the data from
which another is subtracted is stored 0, 2
-126 
|(s1)|

2
128
Single-precision real number Single-precision real number
(s2) Minuend data or head device number where the data that is
subtracted another is stored 0, 2
-126 
|(s2)|

2
128
Single-precision real number Single-precision real number
(d) Head device number for storing the operation result

Single-precision real number Single-precision real number
Operand Bit Word Double word Indirect
specification Constant Others
X, Y, M, L,
SM, F, B, SB U

\G

T, ST,
C, LC T, ST, C, D,
W, SD, SW, R U

\G

Z LC LZ K, H E $
(s1)
            
(s2)
            
(d)
            
Device Name Description
Condition Operation
SM700 Carry The absolute value of the operation result

2
128
The value of (d) is the maximum value (2
128
) of 32-bit real
numbers and the carry flag SM700 turns on.
SM8020 Zero The operation result is true "0".
(The mantissa part is "0"). The zero flag SM8020 turns on.
SM8021 Borrow The absolute value of the operation result < 2
-126
The value of (d) is the minimum value (2
-126
) of 32-bit real
numbers and the borrow flag SM8021 turns on.
SM8022 Carry The absolute value of the operation result

2
128
The value of (d) is the maximum value (2
128
) of 32-bit real
numbers and the carry flag SM8022 turns on.
(s1) (s2) (d)
(s1)+1 (s1) (d) (d)+1
-
(s2)+1 (s2)
Single-precision real number Single-precision real number Single-precision real number
(s1)+1 (s1) (d) (d)+1
-
[ K2346 ]
Single-precision real number Single-precision real number Converted into a single-precision
real number automatically.