Siemens SIMATIC ET 200AL - Page 825

OPC UA communication
9.1 What you need to know about OPC UA
Communication
Function Manual, 12/2017, A5E03735815-AF
139
The following figure shows the "UA Sample Client" of the OPC Foundation.
The client has established a secure connection to the OPC UA server of an S7-1500 CPU to
the endpoint "opc.tcp://192.168.178.151:4840 - [SignAndEndCrypt: Basic128Rsa15:Binary]".
The security settings "SignAndEndCrypt:Basic128Rsa15" are contained in the endpoint.
Note
Select an endpoint with as strict as possible a security policy
Select an application
-appropriate security policy for the end point and disable the less strict
security policy at the OPC UA server.
A Sha256 certificate
is required for the two most secure end points (Basic256Sha256) of the
S7
-1500 CPU OPC UA server.
Figure 9-4 "UA Sample Client" program of the OPC Foundation
A connection to a server end point is only established if the OPC UA client complies with the
security policies of that end point.