SEL_DT block

Short summary

Name	`SEL_DT`
→POU type	→function
Category	Standard (safe), Select
Conform to →IEC-standard	no restrictions
Graphical interface
Available since	version 1.21.0 (for Neuron Power Engineer) – initial variant version 2.0.4 (for library `Standard`) – changed location (from sub-library `SelectEnh` to `Select`) version 3.8.0 (for library `Standard (safe)`): block provided in this library

Functionality

The block makes a binary selection – analogous to the SEL block. In contrast to that block, SEL_DT allows the connection with DT only (for IN0 and IN1).

Inputs, return value

	Identifier	→Data type	Description
Inputs:	`G`	`BOOL`	selector
	`IN1`	`DT`	1st value
	`IN2`	`DT`	2nd value
Return value:	–	`DT`

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.

Example for usage within ST-editor

PROGRAM Test

VAR

        result1 : DATE_AND_TIME;

        result2 : DATE_AND_TIME;

    END_VAR

    result1 := SEL_DT(G := FALSE, IN0 := DT#2014-10-01-05:00:00.000_000_000, IN1 := DT#2014-10-02-08:00:00.000_000_000);   (* The variable 'result1' evaluates to 'DT#2014-10-01-05:00:00.000_000_000'. *)

    result2 := SEL_DT(G := TRUE, IN0 := DT#2014-10-01-05:00:00.000_000_000, IN1 := DT#2014-10-02-08:00:00.000_000_000);    (* The variable 'result2' evaluates to 'DT#2014-10-02-08:00:00.000_000_000'. *)

END_PROGRAM

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