Siemens SIMATIC ET 200AL, System Manual

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OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
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9.3.5.2 Boundary conditions for using server methods
Permitted data types
If you provide server methods, observe the following rule:
•
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/arrays/UDTs for
input and output parameters of self-created server methods (UAMethod_InParameters and
UAMethod_OutParameters).
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 de-
rived data types
User-defined data type required (UDT, user-defined
data type)
The user-defined data type must be created with the
prefix "Union_", for example "Union_MyDatatype".
The first element (Selector) in this UDT must have the
data type "UDINT".
UNION and all derived data types