OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
182 Function Manual, 12/2017, A5E03735815-AF
Integrating the server method
The diagram below shows how an OPC UA client (A) calls the server method "Cool":
The CPU executes the instance "Cool1" of the server method "Cool" in the cyclic user
program
⑥.
The CPU first uses the instruction "OPC_UA_ServerMethodPre" to query
④ whether an
OPC UA client has called the server method "Cool"
①.
● If the server method has not been called, program execution returns directly to the cyclic
user program over
④ and ⑥. The CPU resumes the cyclic user program after "Cool1".
● If the server method has been called, this information is returned to the server method
"Cool" over
④. This is where the actual functionality is then executed; see "<Method
functionality>" in the diagram.
The server method then uses the instruction "OPC_UA_ServerMethodPost"
⑤ to notify
the firmware (B) that is has been executed
③.
The firmware returns this information over
② to the calling OPC UA client (A).
To Next Page
Loading...
