Useful Information About The Client Instructions - Siemens SIMATIC S7-1500 Function Manual

OPC UA communication
9.4 Using the S7-1500 CPU as an OPC UA client
Overview
To use the editor and the connection parameter assignment, follow these steps:
1. First, specify a client interface. Add to this the PLC tags and PLC methods interface that
you want to access ("First step (Page 251)").
2. Next, configure the connection to the OPC UA server (Second step (Page 268)).
3. Finally, use the configured connection for the OPC UA client instructions (Third step
(Page 276)).
9.4.2

Useful information about the client instructions

With the standardized OPC UA client instructions you are able to control communication for
the following tasks with the S7-1500 CPU as an OPC UA client:
● Read/write tags of the OPC UA server
● Call methods in the OPC UA server
Optional instructions can be used to determine the following information:
● The status of the connection between the OPC UA client and OPC UA server
● Node IDs of nodes with known hierarchy of the address space
Standardized sequence of OPC UA communication
The sequence of the communication, and thus the order of the instructions, follows a pattern
that is illustrated in the following.
①
②
③
Figure 9-54
246
Instructions for preparation of read and write operations
Read and write instructions
Instructions for "clean-up" after a completed read or write operation
Run sequence for a read or write operation
Function Manual, 11/2019, A5E03735815-AH
Communication