Supported data types in C#

The following table illustrates how the IEC 61131‑3 data types are linked to the .Net framework and to C#, respectively.

Note: Variables of data types that are marked with a + in the Attribute mandatory column must have the (otherwise optional) attribute DataType for unambiguous assignment.

IEC 61131-3 data type .Net framework data type C# data type Attribute mandatory
BOOL System.Boolean bool –
SINT System.SByte sbyte –
BYTE System.Byte byte +
USINT System.Byte byte –
INT System.Int16 short –
DINT System.Int32 int –
LINT System.Int64 long –
UINT System.UInt16 ushort –
UDINT System.UInt32 uint –
ULINT System.UInt64 ulong –
WORD System.UInt16 ushort +
DWORD System.UInt32 uint +
LWORD System.UInt64 ulong +
REAL System.Single float –
LREAL System.Double double –
TIME System.Int32 int +
LTIME System.Int64 long +
LDATE System.Int64 long +
LTIME_OF_DAY System.Int64 long +
LDATE_AND_TIME System.Int64 long +
DWORD System.UInt32 uint +
LWORD System.UInt64 ulong +
STRING System.Iec61131Lib.IecStringEx – –
WSTRING (from 2021.6) System.Iec61131Lib.IecWString (from 2021.6) – –
ANY System.Iec61131Lib.Any – +
ANY_MAGNITUDE System.Iec61131Lib.Any – +
ANY_NUM System.Iec61131Lib.Any – +
ANY_INT System.Iec61131Lib.Any – +
ANY_SIGNED System.Iec61131Lib.Any – +
ANY_UNSIGNED System.Iec61131Lib.Any – +
ANY_REAL System.Iec61131Lib.Any – +
ANY_BIT System.Iec61131Lib.Any – +
ANY_ELEMENTARY System.Iec61131Lib.Any – +
ANY_STRING System.Iec61131Lib.Any – +

 

 

See also

  1. C# in PLCnext Technology
  2. Supported functions of the C# programming system
  3. eCLR Programming System
  4. Libraries in the System namespace
  5. Required installations for C#
  6. Creating a C# function block library
  7. C# Remote debugging
  8. Providing help files for PLCnext Engineer
  9. Providing a library description
  10. C# guideline
  11. Supported port connectors
  12. Supported elementary data types

 

 

• Published/reviewed: 2025-10-15  ☂  Revision 085 •