Allen-Bradley Logix5000 Reference Manual page 304

Chapter 7 Move/Logical Instructions (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT)
Condition
Prescan
Rung-condition-in is false
Rung-condition-in is true
Postscan
value_1
Before BTD Instruction
value_1
After BTD Instruction
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Execution:
Relay Ladder Action
The rung-condition-out is set to false.
The rung-condition-out is set to false.
The instruction copies and shifts the Source bits to the Destination.
The rung-condition-out is set to true.
The rung-condition-out is set to false.
Example 1:
When enabled, the BTD instruction moves bits within value_1.
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Example 2:
When enabled, the BTD instruction moves 10 bits from value_1 to value_2.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Destination Bit
The shaded boxes show the bits that changed in value_1.
Source Bit