LT block
Short summary
Name |
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→POU type |
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Category |
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Conform to →IEC-standard |
currently restricted |
Graphical interface |
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Available since |
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Functionality
The block is a comparator regarding increasing sequence ("Less Than").
Enter the values at the inputs, those values are to be compared. The block returns value TRUE
(or an equivalent), if a value connected to an input is less than the value connected to the respectively following input – hence, if: (IN1<IN2) & (IN2<IN3) & ... & (IN15<IN16)
Bitstring values (= ANY_BIT
values; see →generic data type} are treated like unsigned →integer values by the block. This behavior is a specification according to the →IEC-standard.
Inaccuracies for floating-point numbers Due to the internal representation of floating-point numbers (affects the data types |
Inputs, return value
Inputs: |
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1st value |
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2nd value |
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... (extensible until) |
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16th value |
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Return value: |
– |
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Input EN
and output ENO
are available when →calling the block. See "Execution control: EN, ENO" for information on input EN
and output ENO
.
See:
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"Blocks for safe logic" whether this block is supported for developing safety-relevant applications.
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"Highlighting safe logic in the FBD-editor" for the effects when using the block as a block for safe logic.
Example for usage within ST-editor
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When creating your application within the ST-editor, enter a call of a block by typing the text as requested by the syntax or use Content Assist.