Chapter 7 Second Development Platform VP3000 
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Instruction Function 
INV  Inverse operation result 
Operand N/A 
 Description 
Invert the logical operation result before INV instruction, and store it in the accumulative 
register. 
Example 
Ladder diagram: 
X0
Y1
 
Instruction code  Operation 
LD  X0  Load X0 (the contact B) 
INV   
Inverse operation 
result 
OUT Y1 Drive Coil Y1 
 
Instruction Function 
P  Pointer 
Operand P0–P255 
 Description 
Pointer P is used for call instruction API 01 CALL of subprogram. The use of P does not 
need to start from number 0, and the number cannot be used repeatedly; otherwise, 
unexpected errors may occur. 
Example 
Ladder diagram: 
X0
Y1
CALL
P10
X1
P10
 
Instruction code  Operation 
LD X0  Load X0 (the contact A) 
CALL P10 
CALL instruction 
reaches P10 
⁞  
P10    Pointer P10 
LD  X1  Load X1 (the contact A) 
OUT Y1 Drive Coil Y1