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  • FLL block



The FLL block implements the FLL instruction. When the rung conditions are true, the block fills a block of memory with the provided source value. The Source remains unchanged.


  • Source elements should be scalar numeric data types.

  • Destination elements should be scalar numeric data types.

  • Source and destination elements should be of the same data type.

  • Source initial element index and destination element initial index start from zero.



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Controls the execution of the block. EnableIn reflects the rung state preceding the block. If the rung state preceding the block is false, EnableIn is false, the block does not execute and the outputs are not updated.

It gives the value stored at source. This data is copied into destination.

Data Types: int8 | int16 | int32 | int64 | single | String | Structure

Number of destination elements to fill.

Data Types: int8 | int16 | int32


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By default, EnableOut follows the state of EnableIn. If the EnableIn input to the block is false, the logic implemented by the block is not executed and EnableOut signal is set to false.


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The data copied from source is filled to the destination. The destination is specified in the format of tags. In Ladder Diagrams, tags (variables) are used to represent inputs, outputs, and internal memory with attributes such as Data Type, Initial Value, and size. To change the attributes of the Destination Array Name, open the Program Variables table within the Ladder Diagram Program block.

Programmatic Use

Block Parameter: PLCOperandTag
Type: character vector
Value: character vector
Default: 'A'

Destination Start Index is used only when the source is an array. It specifies the start index of destination where the data is copied. If the source and destination data is not stored in an array, then the value of Destination Initial Element Index is 1.

Programmatic Use

Block Parameter: PLCDestArrayIndex
Type: scalar
Value: scalar
Default: 0

Data Types: int8 | int16 | int32 | single

Version History

Introduced in R2019a

See Also