Bit Field Distribute (BTD)

The BTD instruction copies the specified bits from the Source, shifts the bits to the appropriate position, and writes the bits into the Destination.
When enabled, the BTD instruction copies a group of bits from the Source to the Destination. The group of bits is identified by the Source bit (lowest bit number of the Source) and the Length (number of bits to copy). The Destination bit identifies the lowest bit number to start with in the Destination. The Source remains unchanged.
If the length of the bit field extends beyond the Destination, the instruction does not save the extra bits. Any extra bits do not wrap to the next word.
A SINT or INT tag is converted to a DINT value by zero-fill.
Available Languages
Ladder Diagram
Ladder Diagram_Bit Field Distribute (BTD)_v1
FactoryTalk Design Studio
 DSL - Ladder Diagram
Operands
There are data conversion rules for mixed data types within an instruction. See Data Conversion.
Ladder Diagram
Operand
Type
Format
Description
Source
SINT
INT
DINT
immediate
tag
Tag that contains the bits to move
Source bit
DINT
immediate (0-31)
Number of the bit (lowest bit number) from where to start the move
Must be within the valid range for the Source data type
Destination
SINT
INT
DINT
tag
Tag where to move the bits
Destination bit
DINT
immediate (0-31)
The number of the bit to which the data should be moved must be within the valid range for the Destination data type.
Length
DINT
immediate (1-32)
Number of bits to move
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction. See Common Attributes for operand-related faults.
Execution
Ladder Diagram
Condition/State
Action Taken
Prescan
N/A
Rung-condition-in is false.
N/A
Rung-condition-in is true.
The instruction copies and shifts the Source bits to the Destination.
Postscan
N/A
Examples
Example 1
Ladder Diagram
FTStudio-BTD-LD-EX1-V1
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.
FTStudio-BTD-LD-EX2-V1
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