Overloading conversion

Overloading

Tip

The IEC 61131-3 standard does not provide for overloaded functions.

If you want to program strictly according to IEC 61131-3, then you need to use the operators of the syntax <output type> _TO_ <target type> as described in the following sections.

The operators convert values into other data types, explicitly specifying only a target type (and no output type for the operands) (overloaded conversion).

The rules for typed conversions also apply here for overloading.

Overloading is not part of the IEC 61131-3 standard.

Call syntax: <TO_<target type> ( <operand> )

Operand	Data Type	Description
Variable, Literal	Standard data type	Data Types

Table 9. Overload operators: TO_<target data type>

Operator	Example	Return Value	Description
`TO___UXINT`	`TO___UXINT(123.4)`	`123`	__UXINT, __XINT, __XWORD
`TO___XINT`	`TO___UXINT(123.4)`	`123`	__UXINT, __XINT, __XWORD
`TO___XWORD`			__UXINT, __XINT, __XWORD
`TO_BIT`			BIT
`TO_BOOL`	`TO_BOOL(0.001)`	`TRUE`	BOOL
`TO_BYTE`			Integer
`TO_DATE`			Syntax: `D#yyyy-MM-dd, DATE#yyyy-MM-dd` DATE
`TO_DATE_AND_TIME` `TO_DT`	`TO_DT(0)`	`DT##1970-1-1-0:0:0`	Syntax: `DT#yyyy-MM-dd-hh:mm:ss, DATE_AND_TIME#yyyy-MM-dd-hh:mm:ss` DATE
`TO_DINT`			Integer
`TO_DWORD`			Integer
`TO_INT`	`TO_INT(4.22)` `TO_INT(123.4)`	4 123	Integer
`TO_LDATE`			Syntax: `LDATE#yyyy-MM-dd` DATE
`TO_LDT`			Syntax: `LDT#yyyy-MM-dd-hh:mm:ss.sss` DATE
`TO_LINT`			Integer
`TO_LREAL`			REAL, LREAL
`TO_LTIME`			TIME, LTIME
`TO_LTOD`			Syntax: `LTOD#hh:mm:ss.sssssssss` DATE
`TO_LWORD`			Integer
`TO_REAL`			REAL, LREAL
`TO_SINT`			Integer
`TO_STRING`	`TO_STRING(342)`	`'342'`	STRING
`TO_TIME`	`TO_TIME(SysTimeGetMs())`	System time	TIME, LTIME
`TO_TOD`			DATE
`TO_UDINT`			Integer
`TO_UINT`	`TO_UINT(D#2019-9-3)`	`44288`	Integer
`TO_ULINT`			Integer
`TO_USINT`			Integer
`TO_WORD`			Integer
`TO_WSTRING`	`TO_WSTRING('Hello World')`	`"Hello World!"`	WSTRING

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Overloading conversion

Overloading

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