BECKHOFF Data Access

The BECKHOFF Control drives is capable to access all PLC variables. This chapter outlines the possibilities or accessing these data points and how to configure them.

DataTypes

Following data types are fully supported (read and event callbacks):

DataType	HumanOS System Data Type	TwinCAT Data Type
Boolean Value	System.Boolean	BOOL
8bit unsigned integer	System.Byte	BYTE
8bit unsigned integer	System.UInt8	USINT
16bit unsigned integer	System.UInt16	WORD, UINT
32bit unsigned integer	System.UInt32	UDINT
64bit unsigned integer	System.UInt64	ULINT
8bit signed integer	System.Int8	SINT
16bit signed integer	System.Int16	INT
32bit signed integer	System.Int32	DINT
64bit signed integer	System.Int64	LINT
32bit floating point	System.Single	REAL
64bit floating point	System.Double	LREAL
String values	System.String	STRING
Boolean Array	System.Boolean[]	ARRAY [0..N] OF BOOL
8bit unsigned integer Array	System.Byte[]	ARRAY [0..N] OF BYTE
8bit unsigned integer Array	System.UInt8[]	ARRAY [0..N] OF USINT
16bit unsigned integer Array	System.UInt16[]	ARRAY [0..N] OF WORD, UINT
32bit unsigned integer Array	System.UInt32[]	ARRAY [0..N] OF UDINT
64bit unsigned integer Array	System.UInt64[]	ARRAY [0..N] OF ULINT
8bit signed integer Array	System.Int8[]	ARRAY [0..N] OF SINT
16bit signed integer Array	System.Int16[]	ARRAY [0..N] OF INT
32bit signed integer Array	System.Int32[]	ARRAY [0..N] OF DINT
64bit signed integer Array	System.Int64[]	ARRAY [0..N] OF LINT
32bit floating point Array	System.Single[]	ARRAY [0..N] OF REAL
64bit floating point Array	System.Double[]	ARRAY [0..N] OF LREAL
String values Array	System.String[]	ARRAY [0..N] OF STRING

Writing is also possible, although not all memory ranges are supported.

Address

The native address of a data access point is the absolute variable name.

Example

PROGRAM PRG_Test
VAR
  Int32Value  : DINT;
END_VAR

{
  "Id": "93DEE416-DF8C-4F89-8BCE-EB21EF4963A9",
  "Name": "Int32Value",
  "DataClass": "Event",
  "DataType": "System.Int32",
  "Address": "PRG_Test.Int32Value ",
  "Access": {
    "Read": true,
    "Receive": true
  }
}