Mitsubishi MELSEC Q Series Programming Manual page 158

INV
5-16
1. The INV instruction operates based on the results of calculation made until the
INV instruction is given. Accordingly, use it in the same position as that of the
AND instruction.
The INV instruction cannot be used at the LD and OR positions.
2. When a ladder block is used, the operation result is inverted within the range of
the ladder block. To operate a ladder using the INV instruction in combination
with the ANB instruction, pay attention to the range that will be inverted.
M0
M1 M2
0
M10 M20
ANB
10
For details of the ANB instruction, refer to Section 5.2.1
Range inverted
Y10
END