Structured Text - Allen-Bradley Logix5000 Reference Manual

Chapter 7 Move/Logical Instructions (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT)
Source 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Mask1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
Dest 0 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1
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2. Mask Source and compare it to Dest. Any required changes are made in
Dest. Source and Target remain unchanged. A 0 in the mask restrains the
instruction from comparing that bit (shown by x in the example).

Structured Text

MVMT_01.Source := value_1;
MVMT_01.Mask := mask1;
MVMT_01.Target := target;
MVMT(MVMT_01);
value_masked := MVMT_01.Dest;
Function Block
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
The shaded boxes show the bits that changed.