Delta C2000 series User Manual page 480

Remarks
Flags and the positive/negative sign of the values:
-2, -1, 0
-2, -1, 0 -2,147,483,648
API
SUB
21
D P
Bit Devices
X Y M K
＊
S
1
＊
S
2
D
Operands: None
1. : Minuend
E xplanation S
1
2. This instruction subtracts S
3. The highest bit is symbolic bit 0 (+) and 1 (-), which is suitable for algebraic
subtraction.
4. Flag changes in binary subtraction
In 16-bit instruction:
If the operation result ＝ 0, zero flag M1020 = On.
If the operation result ＜ -32,768, borrow flag M1021 = On.
If the operation result ＞ 32,767, carry flag M1022 = On.
In 16-bit BIN subtraction:
Example
When X0 = On, the content in D0 will minus the content in D10 and the remainder will
be stored in D20.
X0
16 bit: Zero flag
-32,768
The highest bit
Borrow flag
of the data
= 1 (negative)
32 bit: Zero flag
The highest bit
Borrow flag
of the data
= 1 (negative)
S1 S2 D
Word Devices
H KnX KnY KnM T
＊ ＊ ＊ ＊ ＊
＊ ＊ ＊ ＊ ＊
＊ ＊ ＊
: Subtrahend
S
2
SUB
Chapter 16 PLC Function |C2000 Series
Zero flag
-1, 0 1
The highest bit
of the data
= 0 (positive)
Zero flag
-1, 0 1
The highest bit
of the data
= 0 (positive)
Subtraction
16-bit command (7 STEPS)
SUB
C D
＊ ＊
32-bit command (13 STEPS)
＊ ＊
－
＊ ＊
Flag signal: M1020 Zero flag
D: Remainder
and S in BIN format and stores the result in D.
1 2
D0 D10
D20
16-57
Zero flag
32,767 0 1 2
Carry flag
Zero flag
2,147,483,647 0 1 2
Carry flag
SUBP
－ －
M1021 Borrow flag
M1022 Carry flag
－