Siemens PROFINET SIRIUS 3RW5 - Page 109

• Scalability
OPC UA can be used for devices of di󹪜erent performance classes:
– Sensors
– Embedded systems
– Controllers
– PC systems
– Smartphones
– Servers with MES or ERP applications.
The performance class of the devices is di󹪜erentiated by pro󹪝les. Di󹪜erent OPC UA pro󹪝les
o󹪜er the possibility to scale OPC UA both for very small and simple devices as well as for very
powerful devices. An OPC UA pro󹪝le describes functions and services that must be supported
by the server and the client. In addition, further functions and services that are not required
by the pro󹪝le can be optionally provided.
Nano Embedded Device 2017 Server Pro󹪝le
The "Nano Embedded Device 2017 Server Pro󹪝le" from the OPC Foundation is available for
the smallest devices with severely limited functionality. This pro󹪝le corresponds functionally
to the Core Server facet and de󹪝nes the binary OPC UA TCP protocol as the required transport
pro󹪝le. The pro󹪝le permits connections without UA security, no subscriptions, and no
method calls. The support of diagnostic objects and variables is optional for this pro󹪝le.
Other pro󹪝les are based on the "Nano Embedded Device 2017 Server Pro󹪝le", require more
resources, and o󹪜er more functionality.
Micro Embedded Device 2017 Server Pro󹪝le
This pro󹪝le o󹪜ers limited functionality, additional subscriptions/data monitoring, but no UA
security and no method calls. The pro󹪝le requires at least two parallel connections.
3RW5 PROFINET High Feature communication module
The 3RW5 PROFINET High Feature communication module supports the "Micro Embedded
Device 2017 Server Pro󹪝le" and additionally UA security.
• OPC UA uses security mechanisms at di󹪜erent levels:
– Establishing secure connections between an OPC UA server and an OPC UA client is only
possible if the client and server can log on using X.509-v3 certi󹪝cates and mutually
recognize each other's certi󹪝cates (application-level security). Various security policies
are possible, including an unsecured connection between server and client (security
policy: "No Security").
– For authorized access (authentication), a server can generally require the following
information from the user: A user certi󹪝cate, user name and password, no legitimation of
the user.
The security mechanisms are optional and con󹪝gurable.
Schema 󹪝les used for OPC UA functionality
The OPC Foundation provides its users with schemas that manufacturers can use for server
implementations.
Functions
8.4 OPC UA server
SIRIUS 3RW5 PROFINET communication modules
Equipment Manual, 05/2021, A5E35631297002A/RS-AD/004 109