Creating A Server Interface For Reference Namespace - Siemens SIMATIC S7-1500 Function Manual

● Local data
STEP 7 displays the data block which is assigned to the OPC UA node: The CPU reads
the value of the OPC UA node from this data block.
If a data block is highlighted in color (e.g. after a consistency check), the specified data
block is not available in the CPU.
In this case, you have to create the missing data block in the CPU (of user program) and
supply it with values.
● Data type
The SIMATIC data type of the PLC tag (e.g. element of a data block) in the CPU, from
which the value of an OPC UA node (UAVariable type) is read, or to which a value is
assigned.
Consistency check
You have the option to check the server interface.
STEP 7 (TIA Portal) checks whether the OPC UA node of the server interface PLC tags
(data blocks) has been assigned compatible SIMATIC data types.
To check the consistency of the server interface, click on the following icon in the toolbar of
the OPC UA server interface editor:
Export interface
You have the option of exporting the OPC UA server interface as an XML file. This XML file
contains all data type definitions referenced by the server interface.
To export the OPC UA server interface, click on the following icon in the toolbar of the OPC
UA server interface editor:
9.3.4.7

Creating a server interface for reference namespace

Companion specifications and referenced namespaces
A series of OPC UA object types (as well as additional definitions) are defined in a
companion specification. These object types are each defined in namespaces so that the
names of the object types (type definitions) are unique.
To use a companion specification in your project, create instances of object types of this
companion specification.
To do this the object definitions must be available in your STEP 7 project. If this is not the
case, you must import the object definitions. To import all definitions of a namespace, create
a server interface of type "Reference namespace" for each namespace in STEP 7.
Communication
Function Manual, 11/2019, A5E03735815-AH
OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
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