Time Monitoring Of The Blocks - Siemens SIMATIC S7-400 Operating Instructions Manual

Programming the OPC UA client blocks

5.2 Time monitoring of the blocks

Figure 5-1
If the connection is no longer required, release the handles on the server again using the
block UA_NodeReleaseHandleList. This deletes the handles on the server.
The connection is terminated with UA_Disconnect and the session is ended.
5.2 Time monitoring of the blocks
Parameters for the time response of the blocks
To control and monitor the time response of the program blocks, the the following three
parameters are available:
● Timeout
Input parameter in all blocks for the OPC UA client
● SessionTimeout
Input parameter in the block UA_Connect
● MonitorConnection
Input parameter in the block UA_Connect
Since the parameters influence the running of the OPC UA communication as a whole,
below notes on these parameters precede the block description.
Timeout
With this input parameter you monitor every block call. If a block call cannot be completed
within the configured maximum permissible time, the status parameter "Error" is set to 1 and
processing aborted.
SessionTimeout
With this input parameter you monitor the duration of a session without data traffic without
the block "UA_Disconnect" being called to terminate a connection.
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Calling the client program blocks and their interaction
Operating Instructions, 01/2017, C79000-G8976-C427-02
CP 443-1 OPC UA