Siemens SIMATIC S7-400 Operating Instructions Manual page 54

Configuration and operation
4.7 Configuration of the CP in STEP 7 V5
● "Default port"
Here, you can change the port number of the application. As default port number 4840 is
used, the standard TCP port for the OPC UA binary protocol.
Permitted port numbers are as follows:
– 2000 .. 4499
– 4501 .. 34963
– 34965 .. 49151
● "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 supported 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
"Use symbols"
Here, you specify the symbols of the CPU that the server application may access.
● "All symbols"
If you select this option, all symbols are available to the server application.
● "Configured symbols"
If you enable this option, only the configured CPU symbols are available to the server
application. If the option is enabled, the "Configure" button becomes operable.
● "Configure ..."
With this button you open the dialog for specifying the OPC-specific properties of the
symbols to be used by the OPC UA server.
Here you can configure the following among other things for the individual symbols
(variables):
– Visibility
– Access rights (read/write)
With the consistency check of STEP 7, you can recognize whether or not you have reached
the maximum permitted number of sysmbols.
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Symbols without visibility are excluded from OPC applicationa.
Operating Instructions, 01/2017, C79000-G8976-C427-02
CP 443-1 OPC UA