Operator ‘TO_BOOL’

This IEC operator is used for converting from another variable type into a BOOL variable.

<data type>_TO_BOOL

The result yields TRUE when the operand does not equal 0. The result yields FALSE when the operand equals 0.

For the STRING type, the result is TRUE if the operand is TRUE; otherwise it is FALSE.

Examples

ST Code	Result
b := BYTE_TO_BOOL(2#11010101);	TRUE
b := INT_TO_BOOL(0);	FALSE
b := TIME_TO_BOOL(T#5ms);	TRUE
b := STRING_TO_BOOL('TRUE');	TRUE

FBD Code	Result
	TRUE
	FALSE
	TRUE
	TRUE