Attention

IronPLC can only run very simple programs. The steps described are accurate but many language features are not yet supported.

Data Types

IEC 61131-3 defines a set of elementary data types and mechanisms for creating derived types.

Elementary Types

Type	Size	Description	Status
BOOL	1 bit	Boolean	Supported
SINT	8 bits	Signed short integer	Supported
INT	16 bits	Signed integer	Supported
DINT	32 bits	Signed double integer	Supported
LINT	64 bits	Signed long integer	Supported
USINT	8 bits	Unsigned short integer	Supported
UINT	16 bits	Unsigned integer	Supported
UDINT	32 bits	Unsigned double integer	Supported
ULINT	64 bits	Unsigned long integer	Supported
REAL	32 bits	Single-precision floating point	Supported
LREAL	64 bits	Double-precision floating point	Supported
BYTE	8 bits	Bit string of 8 bits	Supported
WORD	16 bits	Bit string of 16 bits	Supported
DWORD	32 bits	Bit string of 32 bits	Supported
LWORD	64 bits	Bit string of 64 bits	Supported
STRING	Variable	Single-byte character string	Not yet supported
WSTRING	Variable	Double-byte character string	Not yet supported
TIME	64 bits	Duration	Not yet supported
DATE	—	Calendar date	Not yet supported
TIME_OF_DAY	—	Time of day	Not yet supported
DATE_AND_TIME	—	Date and time of day	Not yet supported

Derived Types

Type	Description	Status
Enumerated types	Named set of values	Partial
Subrange types	Integer type restricted to a range	Partial
Array types	Fixed-size indexed collection	Not yet supported
Structure types	Record with named fields	Partial