KEYENCE Visual KV Series - Manual (Page 175)

2.4 Instruction Details
1
2
3-151 Chapter 2 Instructions
ADD (Addition)
Coding
Description
• The ADD instruction adds the operand value to the contents of the internal
register and inputs the result back to the internal register.
• In the above example, "#00100" is added to the contents of DM0000 and the
result is stored in DM0001.
• When the contents of DM0000 is "#00100", for example, "#00200" is stored in
DM0001.
DM0000 (#00100) + #00100 → DM0001(#00200)
Note 1: An overflow occurs when the operation result exceeds 16 bits ($FFFF,
#65535). In such a case, only the data of the low-order 16 bits is input back to the
internal register. For example, when the contents of the internal register is "$FFFF"
and the operand is "$0001", the result will overflow.
Note 2: When an overflow occurs, special utility relay 2009 turns ON.
Tips
Solution when operation result overflows 16 bits
DM0000 + DM0001 = DM0003 (High-order 16 bits), DM0002 (Low-order 16 bits)
DM0000 and DM0001 must be 16 bits or less.
Arithmetic flag
2009 Turns ON when the result of an ADD operation exceeds the range of 16 bits
($FFFF). Turns OFF at other times.
2010 Turns ON when the contents of the internal register is "0" after an ADD
operation. Turns OFF at other times.
2011 No change
2012 The DM or relay indirectly addressed with #TM is out of range.
➮ "Indirect addressing" (p. 3-127)
DM0000
LDA
#00100
ADD
DM0001
STA
2002
Line No. Instruction Operand
0000 LD 2002
0001 LDA DM0000
0002 CON
0003 ADD #00100
0004 CON
0005 STA DM0001
Example:
Internal register
1
1
= $FFFF 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0 + = $0002 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
0 = $0001
2009
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
Operand
Overflow
Special
utility relay Input back internal register Result
DM0000
LDA
DM0001
ADD
DM0002
STA
#00000
LDA
DM0003
STA
DM0002
STA
#00001
LDA
DM0003
STA
2002 2009
2009
ADD / @ADD
KVNKA Chap 02_4cP.p65 08.3.11, 0:02 PM 151