Data Types For Companion Specifications - Siemens SIMATIC ET 200AL System Manual

9.3.4.5

Data types for companion specifications

Mapping of data types
The table below shows the compatible SIMATIC data type for each OPC UA data type.
Assign the data types as shown below (SIMATIC data type - OPC UA data type). Other
assignments are not permitted. STEP 7 does not check the observance of this rule and does
not prevent an incorrect assignment. You are responsible for the rule-compliant selection and
assignment of the data types.
You can also use the listed data types, for example, as elements of structures/UDTs for input
and output parameters of self-created server methods (UAMethod_InParameters and
UAMethod_OutParameters).
Table 9- 3
SIMATIC data type
BOOL
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
REAL
LREAL
LDT
WSTRING
DINT
User-defined data type required (UDT,
user-defined data type)
The user-defined data type must be cre-
ated with the prefix "Union_", for exam-
ple "Union_MyDatatype". See example
below the table.
The first element (Selector) in this UDT
must have the data type "UDINT".
Communication
Function Manual, 05/2021, A5E03735815-AJ
Mapping of data types
9.3 Using the S7-1500 as an OPC UA server
OPC UA data type
Boolean
SByte
Int16
Int32
Int64
Byte
UInt16
UInt32
UInt64
Float
Double
DateTime
String
Enumeration (Encoding Int32) and all derived data types
UNION and all derived data types
OPC UA communication
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