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6 BASIC INSTRUCTIONS
6.2 Arithmetic Operation Instructions
â– When specifying the same device in the source and destination
The same device number can be specified for both the source and the destination. In this case, note that the addition result
changes in every operation cycle if a continuous operation type ADD instruction is used.
â– Difference between ADD(P) instruction, +(P) instruction, and INC(P) instruction in a program
for adding "+1"
When ADD(P) instruction is used to add 1 to the contents of D0 every time X1 turns from OFF to ON, ADD(P) instruction is
similar to +(P) instruction and INC(P) instruction described later except for the contents shown in the table below
There is no operation error.
ADD(P) instruction +(P) instruction, INC(P) instruction
Flag (zero, borrow or carry) Operates Does not operate
Operation result (s)+1=(d) +32767  0  +1  +2 … +32767  -32768  -32767 …
ADD
D0 K25 D0
X1
(D0)+25 → (D0)
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