OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
Function Manual, 05/2021, A5E03735815-AJ
265
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
Mapping of data types
SIMATIC data type
OPC UA data type
BOOL
Boolean
SINT
SByte
INT
Int16
DINT
Int32
LINT
Int64
USINT
Byte
UINT
UInt16
UDINT
UInt32
ULINT
UInt64
REAL
Float
LREAL
Double
LDT
DateTime
WSTRING
String
DINT
Enumeration (Encoding Int32) and all derived data types
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".
UNION and all derived data types
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