TwinCAT datatypes in .NET

Published on Oct 3, 2022. Last updated on Mar 25, 2024.

twincat

When you’re working with ADS, you often need to know the size of a data type or what a data type is called in your .NET language. I couldn’t find the combined information, so I decided to make the overview myself.

IEC61131-3	System Manager	.NET type	C#	Visual Basic	Lower bound	Upper bound	Memory space
`BOOL`	`BIT`	`System.Boolean`	`bool`	`Boolean`	0 (`FALSE`)	1 (`TRUE`)	8 bit
`BOOL`	`BIT8`	`System.Boolean`	`bool`	`Boolean`	0 (`FALSE`)	1 (`TRUE`)	8 bit
`BYTE`	`BITARR8`	`System.Byte`	`byte`	`Byte`	0	255	8 bit
`WORD`	`BITARR16`	`System.UInt16`	`ushort`	-	0	65535	16 bit
`DWORD`	`BITARR32`	`System.UInt32`	`uint`	-	0	4.29·10⁹	32 bit
`SINT`	`INT8`	`System.SByte`	`sbyte`	-	-128	127	8 bit
`INT`	`INT16`	`System.Int16`	`short`	`Short`	-32768	32767	16 bit
`DINT`	`INT32`	`System.Int32`	`int`	`Integer`	-2.15·10⁹	2.15·10⁹	32 bit
`LINT`	`INT64`	`System.Int64`	`long`	`Long`	-2⁶³	-2⁶³-1	64 bit
`USINT`	`UINT8`	`System.Byte`	`byte`	`Byte`	0	255	8 bit
`UINT`	`UINT16`	`System.UInt16`	`ushort`	-	0	65535	16 bit
`UDINT`	`UINT32`	`System.UInt32`	`uint`	-	0	4.29·10⁹	32 bit
`ULINT`	`UINT64`	`System.UInt64`	`ulong`	-	0	2⁶⁴-1	64 bit
`REAL`	`FLOAT`	`System.Single`	`float`	`Single`	-3.40·10³⁸	3.40·10³⁸	32 bit
`LREAL`	`DOUBLE`	`System.Double`	`double`	`Double`	-1.798·10³⁰⁸	1.798·10³⁰⁸	64 bit

Sources

❮ Why am I getting a page fault in TwinCAT?

How to use MC_TorqueControl? ❯

Like my work? Consider a donation!