Allen-Bradley MicroLogix 1400 - MVM - Masked Move

Publication 1766-RM001A-EN-P - October 2008
264 Move Instructions
MVM - Masked Move
Instruction Type: output
The MVM instruction is used to move data from the source to the
destination, allowing portions of the destination to be masked. The mask
bit functions as follows:
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, 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.
Using the MVM Instruction
When using the MVM instruction, observe the following:
• Source, Mask, and Destination must be of the same data size (i.e. all
words or all long words).
To mask data, set the mask bit to zero; to pass data, set the mask bit
to one. The mask can be a constant value, or you can vary the mask
by assigning a direct address.
MVM
Masked Move
Source N7:0
0<
Mask N7:1
0000h<
Dest N7:2
0<
MVM
Execution Time for the MVM Instruction
Controller Data Size When Rung Is:
True False
MicroLogix 1400 word 0.2210 µs 0.1750 µs
long word 1.9050 µs 0.2180 µs
Mask Function for MVM Instruction
Source Bit Mask Bit Destination Bit
1 0 last state
0 0 last state
111
010
TIP
Bits in the destination that correspond to zeros in the mask are not
altered as shown in the shaded areas in the following table.
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