OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
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Status "Bad" (8000_0000 - FFFF_FFFF)
810E0000 BadLicenseExpired The server requires a license to operate in general or to perform a service or
operation, but existing license is expired.
810F0000 BadLicenseLimitsExceeded The server has limits on number of allowed operations / objects, based on
installed licenses, and these limits where exceeded.
81100000 BadLicenseNotAvailable The server does not have a license which is required to operate in general
or to perform a service or operation.
The executable attribute does not allow the execution of the method.
The number was not accepted because of a numeric overflow.
The request has not been processed by the server yet.
Using OPC UA information models
9.3.5.1
Using OPC UA companion specifications
Introduction
OPC UA is universally applicable: The standard itself does not, for example, specify how
PLC tags are to be named. It is also up to the individual user (application developer) to
program and name server methods that can be called over OPC UA.
Information modeling and standardization for devices and sectors
For applications of the same kind, it is worth standardizing your device or machine interface
with the "OPC UA toolkit".
Many different bodies and working groups have driven forward standardization and
developed a range of companion specifications.
These specifications define:
● The objects, methods and tags with which a typical device or machine is to be described.
● The namespace intended for the specified objects.
Machines are typically structured in functional or technological units, and these units are
then standardized.
Companion specifications offer machine and plant operators the benefits of a standardized
interface. For example, all RFID readers that comply with the AutoID specifications can be
integrated in the same way. This means that all RFID readers that comply with the AutoID
specifications can be addressed by OPC UA clients in the same way irrespective of
manufacturer.
Another example of companion specifications is the Euromap 77 Companion Specifications
from the injection molding machinery sector.
The following section uses the example of Euromap 77 to detail how to apply companion
specifications in STEP 7 (TIA Portal) and create the necessary PLC tags.
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