Chapter 14 PLC Function |C200 Series
14-48
API
21 D
SUB
P
S1 S2 D
Subtraction
Bit Devices Word Devices
X Y M K H KnX KnY KnM T C D
S
1
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
S
2
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
D
＊ ＊ ＊ ＊ ＊
Operands: None
16-bit
command (7 STEPS)
SUB SUBP
32-bit
command (13 STEPS)
－ － － －
Flag signal: M1020 Zero flag
M1021 Borrow flag
M1022 Carry flag
Explanation
1.
S
1
: Minuend S
2
: Subtrahend D: Remainder
2. This instruction subtracts S
1
and S
2
in BIN format and stores the result in D.
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.
Example
In 16-bit BIN subtraction:
When X0 = On, the content in D0 will minus the content in D10 and the remainder will
be stored in D20.
X0
D0 D10
D20
SUB
Call 1(800)985-6929 for Sales
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