Siemens SIMATIC S7-400 Operating Instructions Manual page 69

● Minimum sampling interval
Here you set the minimum sampling interval at which the CP scans the process data of
the configured CPU symbols. The sampling interval is limited to a minimum value of 100
milliseconds to reserve adequate time for other processes that access the CPU via the
backplane bus of the station.
Range of values: 100 .. 65535 ms
Default setting: 500 ms
● Minimum publishing interval
Here you set the minimum publishing interval that the server application of the CP should
support. Lower values set by an OPC UA client are not taken into account.
Range of values: 100 .. 65535 ms
Default setting: 500 ms
Export
Here you can export the PLC tags configured for OPC UA as an XML file, for example to
make them available to an OPC UA client.
● Export
Saves the PLC tags configured for OPC UA as an XML file in the file system of the ES.
Depending on the option enabled in "OPC UA server > Load PLC tags of the CPU" all or
only the configured PLC tags are exported.
Security policy
In the table you specify the Security profiles and access options for the UA server of the CP.
● Enable
Select the required check box in the "Enable" column whose security policy the CP will
use.
● Security profile
Here, select one or more options of the security procedure:
– No access
– BasicXXX...
CP 443-1 OPC UA
Operating Instructions, 01/2017, C79000-G8976-C427-02
The CP does not use any security procedure.
Required security procedure.
4.8 Configuration of the CP in STEP 7 Professional
Configuration and operation
69