Short summary

Name	`SEL`
→POU type	→function
Category	IEC-block, Select
Conform to →IEC-standard	currently restricted (IEC demands data type `ANY` for the inputs and the return value. Hence the following data types are demanded as well: `LTIME`, `WSTRING`, `WCHAR`, `LDATE_AND_TIME`, `LTIME_OF_DAY` and `LDATE` . Currently, these data types are not supported for the block.)
Graphical interface
Available since	version 1.21.0 (for logi.CAD 3) – initial variant version 1.109.0 (for logi.CAD 3) – enhancement: `STRING` , `CHAR`, user-defined data types and references for `IN1`, `IN2` and for the return value

Functionality

The block makes a binary selection.

If input G is set to value FALSE (or an equivalent), the block returns the value of input IN0. If input G is set to value TRUE (or an equivalent), the block returns the value of input IN1.

Inputs, return value

	Identifier	→Data type	Description
Inputs:	`G`	`BOOL`	selector
	`IN1`	`REAL`, `LREAL`, `USINT`, `UINT`, `UDINT`, `ULINT`, `SINT`, `INT`, `DINT`, `LINT`, `TIME`, `BOOL`, `BYTE`, `WORD`, `DWORD`, `LWORD`, `STRING`, `CHAR`, `DATE_AND_TIME`, `DATE`, `TIME_OF_DAY`, a →user-defined data type, a →function block or a →reference Restriction: In case of →array data types, only one-dimensional arrays are allowed.	1st value
	`IN2`	`REAL`, `LREAL`, `USINT`, `UINT`, `UDINT`, `ULINT`, `SINT`, `INT`, `DINT`, `LINT`, `TIME`, `BOOL`, `BYTE`, `WORD`, `DWORD`, `LWORD`, `STRING`, `CHAR`, `DATE_AND_TIME`, `DATE`, `TIME_OF_DAY`, a →user-defined data type, a →function block or a →reference Restriction: In case of →array data types, only one-dimensional arrays are allowed.	2nd value
Return value:	–	`REAL`, `LREAL`, `USINT`, `UINT`, `UDINT`, `ULINT`, `SINT`, `INT`, `DINT`, `LINT`, `TIME`, `BOOL`, `BYTE`, `WORD`, `DWORD`, `LWORD`, `STRING`, `CHAR`, `DATE_AND_TIME`, `DATE`, `TIME_OF_DAY`, a →user-defined data type, a →function block or a →reference Restriction: In case of →array data types, only one-dimensional arrays are allowed.

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 : INT;
		result2 : DINT;
	END_VAR
	result1 := SEL(G := FALSE, IN0 := INT#1, IN1 := USINT#2);    (* The variable 'result' evaluates to '1'. *)
	result2 := SEL(G := TRUE, IN0 := DINT#1, IN1 := USINT#2);   (* The variable 'result' evaluates to '2'. *)
END_PROGRAM

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.