Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 165)

Using Data Handling Instructions
9–17
Operation
When the rung containing this instruction is true, data at the source address passes
through the mask to the destination address. See the following figure.
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
B3:2 before move
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
source B3:0
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
Mask F0F0
0 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1
B3:2 after move
MVM
MASKED MOVE
Source
B3:0
Mask F0F0
Dest B3:2
Mask data by setting bits in the mask to zero; pass data by setting bits in the mask to
one. The mask can be a constant value, or you can vary the mask by assigning a
direct address. Bits in the destination that correspond to zeros in the mask are not
altered.
Programming