Delta VFD015CB21A-21 - Page 332

Chapter 14 PLC Function |C200 Series
14-47
API
20 D
ADD
P
S1 S2 D
BIN Addition
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)
ADD ADDP
32-bit
command (13 STEPS)
－ － － －
Flag signal: M1020 Zero flag
M1021 Borrow flag
M1022 Carry flag
Explanation
1.
S
1
: Summand S
2
: Addend D: Sum
2. This instruction adds S
1
and S
2
in BIN format and store the result in D.
3. The highest bit is symbolic bit 0 (+) and 1 (-), which is suitable for algebraic
addition, e.g. 3 + (-9) = -6.
4. Flag changes in binary addition
16-bit command:
A. If the operation result ＝ 0, zero flag M1020 = On.
B. If the operation result ＜ -32,768, borrow flag M1021 = On.
C. If the operation result ＞ 32,767, carry flag M1022 = On.
Example
16-bit command:
When X0 = On, the content in D0 will plus the content in D10 and the sum will be
stored in D20.
X0
D0 D10
D20
A
DD
Remarks
Flags and the positive/negative sign of the values:
-2, -1, 0 -32,768 -1, 0 1 32,767 0 1 2
-2, -1, 0 -2,147,483,648 -1, 0 1 2,147,483,647 0 1 2
16 bit: Zero flag
Zero flag
Zero flag
Borrow flag
The highest bit
of the data
= 1 (negative)
32 bit: Zero flag
Zero flag
Zero flag
The highest bit
of the data
= 0 (positive)
Carry flag
Borrow flag
Carry flag
The highest bit
of the data
= 1 (negative)
The highest bit
of the data
= 0 (positive)
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