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OPC UA communication

9.3 Using the S7-1500 as an OPC UA server

Server method

When the tag "#Started" has the value "TRUE", this starts the actual user program (lines 15

You have all kinds of programming options in this section: You can read in or output process

values, access global data blocks, call functions and function blocks, etc.

The application program may take several cycles.

To signal the end of the user program set the tag "#Method_Finished" to "TRUE".

With "#Method_Result" you transfer a self-defined error code that is used at the block

parameter "UAMethod_Result" of the instruction "OPC_UA_ServerMethodPost".

Calling the "OPC_UA_ServerMethodPost" instruction

The tag "#Method_Finished" was set in line 21 or 29 (server method) to save the state that

the user program (lines 15 to 31) was executed.

This tag is used in the instruction "OPC_UA_ServerMethodPost" to inform the operating

system if the server method was executed or not (lines 33 to 45).

Function Manual, 12/2017, A5E03735815-AF

Communication

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