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
Function Manual, 05/2021, A5E03735815-AJ
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Information on the server interface
The editor for configuring the OPC UA server interface is structured as a table and provides
the following information:
•
Name
The top node (root node) is named "IMM_Manufacturer_01234" in the example. If a client
browses in the address space of the server, this node is the container for all lower-level
nodes. BrowseName and the DisplayName of this node depend on the name you have
assigned for the server interface.
In this case, for example, this name stands for the injection molding machine as a whole.
It is the name of the instance of the Euromap 77 companion specification that is used
here. According to the companion specification, the instance name should begin with
"IMM", followed by the name of the manufacturer of the injection molding machine; the
serial number of the machine is added to the end. This allows a unique identification of
the machine.
The names of all other (lower-level) nodes are defined by the specification (in the example
above by Euromap 77). These node names must not be changed. This ensures a uniform
view of all injection molding machines, which complies with the specification.
• Node type
Type of the OPC UA node. The type is specified by the companion specification that is
used.
In the following cases, STEP 7 marks a node type in the table in color:
– No definition is included for this in the imported XML file or
– The namespace in which the type was defined is not available in STEP 7.
In this case, create a server interface of the "Reference namespace" type for the missing
namespace or for each of the missing namespaces.
The missing namespaces can be found under "Namespaces" in the properties of the server
interface.
• 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.