Masked Move (Mvm); Relay Ladder; Structured Text - Allen-Bradley Logix5000 Reference Manual

Move/Logical Instructions (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT)

Masked Move (MVM)

dest := (Dest AND NOT (Mask))
OR (Source AND Mask);
Description:
The MVM instruction copies the Source to a Destination and allows portions of the data
to be masked.
This instruction is available in structured text and function block as MVMT, see
page 300.
Operands:

Relay Ladder

Operand
Source
Mask
Destination

Structured Text

This instruction is available in structured text as MVMT. Or you can combine bitwise
logic within an expression and assign the result to the destination. This expression
performs a masked move on Source.
See Structured Text Programming
assignments within structured text.
The MVM instruction uses a Mask to either pass or block Source data bits. A '1' in the
mask means the data bit is passed. A '0' in the mask means the data bit is blocked.
If you mix integer data types, the instruction fills the upper bits of the smaller integer data
types with 0s so that they are the same size as the largest data type.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type Format
SINT Immediate
INT Tag
DINT
A SINT or INT tag converts to a DINT value by zero-fill.
SINT Immediate
INT Tag
DINT
A SINT or INT tag converts to a DINT value by zero-fill.
SINT Tag
INT
DINT
for information on the syntax of expressions and
Description
Value to move
Which bits to block or pass
Tag to store the result
Chapter 7
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