Using A Configured Connection - Siemens SIMATIC ET 200AL System Manual

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OPC UA communication

9.4 Using the S7-1500 CPU as an OPC UA client

"No Security" security policy and authentication via user name and password

You can set the following combination:

Security policy = "No Security" and authentication via user name and password.

• The OPC UA server of the S7-1500 supports this combination. OPC UA clients can connect

and encrypt the authentication data or not.

• OPC UA client of the S7-1500 CPU also supports this combination: However, in runtime it

only connects if it can send the authentication data encrypted via cable!

Result: With the following configuration, not connection can be established in runtime.

• S7-1500 as OPC UA client

• OPC UA server which supports no encryption of authentication data when "No Security"

(="none") is set as security policy.

Using a configured connection

Introduction

This section shows you how to use a configured connection for OPC UA instructions (third

Requirements

• You have created a client interface and added PLC tags and PLC methods to this interface,

see ("First step (Page 322)").

• You have configured a connection to an OPC UA server (Second step (Page 339)).

To read data from an OPC UA server or write data to an OPC UA server, use the following

instructions:

• OPC_UA_Connect

• OPC_UA_NamespaceGetIndexList

• OPC_UA_NodeGetHandleList

• OPC_UA_ReadList or OPC_UA_WriteList

• OPC_UA_NodeReleaseHandleList

• OPC_UA_Disconnect

Function Manual, 05/2021, A5E03735815-AJ

Communication

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