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
Communication
348
Function Manual, 05/2021, A5E03735815-AJ
"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.
See also
Users and roles with OPC UA function rights (Page 238)
9.4.9.4 Using a configured connection
Introduction
This section shows you how to use a configured connection for OPC UA instructions (third
step).
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)).
Overview
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