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Output Unlatch

  • Library:
  • OTU block


OTU is one of the building blocks of a ladder diagram. The OTU block implements the OTU ladder logic instruction. When the rung condition is true, the block clears the operand tag (data bit) to false. When the rung condition is changed to false, the block does not change the status of the data bit. It is generally used after the OTL block to unlatch the state and disable the rung.


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Specify the data bits to be modified. Data bits are specified in the format of tags. In Ladder Diagrams, tags (variables) are used for representing all inputs, outputs, and internal memory with attributes such as Data Type, Initial Value, and size. To change the attributes of the Operand Tag, open the Program Variables table within the Ladder Diagram Program block.

Programmatic Use

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

See Also

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Introduced in R2019a