Short summary

Name	`DT_TO_DATE`
→POU type	→function
Category	IEC-block, Convert, block with internal error diagnostic
Conform to →IEC-standard	no restrictions , but: implementer-specific realization ; see "Functionality"
Graphical interface
Available since	version 1.65.0 (for logi.CAD 3)

Functionality

The blocks serves for explicitly converting the date and time of day (DATE_AND_TIME) connected to input IN into a value of data type DATE.

The block discards the time and returns only the date.

Implementer-specific realization

The IEC-standard defines that it is an error when the connected value is not within the range of values overlapping for the data type of the input and for the result value as well as that the behavior in the case of such an error is implementer specific. In logi.CAD 3, an error is possible regarding the range of values overlapping for this block. The error occurs for the date 1.1.10000 and later dates. For these dates, the block returns the value DT#9999-12-31 (the block truncates the connected value) and the output ENO is set to value FALSE.

Inputs, return value

	Identifier	→Data type	Description
Inputs:	`IN`	`DATE_AND_TIME`	date and time of day to be converted
Return value:	–	`DATE`

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:

"Blocks for safe logic" whether this block is supported for developing safety-relevant applications.
"Highlighting safe logic in the FBD-editor" for the effects when using the block as a block for safe logic .

Internal error diagnostic for block

The block checks the value connected to the input. For the date 1.1.10000 and later dates, t he output ENO of the block is set to value FALSE (or an equivalent). (Moreover, the block returns the value DT#9999-12-31 .)

Example for usage within ST-editor

The calculated values are evaluated by using the Assert block .

FUNCTION_BLOCK ExampleDtToDate
   VAR
      result : DATE;
   END_VAR
   result := DT_TO_DATE(IN := DT#1970-01-01-00:00:12);
 
   Assert(result = D#1970-01-01);
END_FUNCTION_BLOCK

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.