Siemens SIMATIC ET 200AL - Page 851

OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
Function Manual, 12/2017, A5E03735815-AF
165
Settings for sessions
● Maximum timeout for sessions
In this field, you specify the maximum time period before the OPC UA server closes a
session without data exchange.
Possible values between 1 and 600000 seconds.
● Maximum number of OPC UA sessions
In this field, you specify the maximum number of sessions the OPC UA server starts and
simultaneously operates.
The maximum number of sessions is dependent on the performance capability of the
CPU. Each session ties up resources.
Maximum number of registered nodes
In this field, you specify the maximum number of nodes the OPC UA server registers.
The maximum number of registered nodes depends on the capacity of the CPU and is
displayed when you configure the field content (place cursor in field). Each registration ties
up resources.
Note
No error message following attempt to register more than the configured maximum number
of registrable nodes
If a client tries to register more nodes during runtime than the configured maximum number,
the server of the S7
-1500 CPU only registers the configured maximum number. From the
conf
igured maximum number of registrable nodes, the server sends the client the regular
string node IDs so the speed advantage gained by registration for these nodes is lost. The
client does not receive an error message.
When configuring, make sure you have a
sufficient reserve or have the client calculate the
maximum number of nodes allowed before registration.
See also
Which ports are used by the various services for data transfer over TCP and UDP, and what
are the points to note when using routers and firewalls?
(https://support.industry.siemens.com/cs/ww/en/view/8970169
)