304 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 7 Move/Logical Instructions (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT)
Execution:
Example 1: When enabled, the BTD instruction moves bits within value_1.
Example 2: When enabled, the BTD instruction moves 10 bits from value_1 to value_2.
Condition Relay Ladder Action
Prescan The rung-condition-out is set to false.
Rung-condition-in is false The rung-condition-out is set to false.
Rung-condition-in is true The instruction copies and shifts the Source bits to the Destination.
The rung-condition-out is set to true.
Postscan The rung-condition-out is set to false.
value_1
Before BTD Instruction
11111111111111111111100000000000
value_1
After BTD Instruction
11111111111111110 0 0 0 0 00000000000
The shaded boxes show the bits that changed in value_1.
Source Bit
Destination Bit
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