Siemens SIMATIC S7-400 Operating Instructions Manual page 56

Configuration and operation
4.7 Configuration of the CP in STEP 7 V5
The settings made here are downloaded to the station with the configuration data and take
effect when the station starts up.
For information on authentication with a logging server, refer to the section Handling
certificates (Page 59).
"SNMP"
You can select whether you release the protocol version SNMPv1 or SNMPv3 for the CP.
For SNMPv1 you can assign the community strings and enable write access to the CP using
SNMPv1.
For SNMPv3 specify the authentication and the encryption algorithm.
"OPC UA"
The tab is only available for CPs on which the OPC UA server function was enabled.
Here you specify the Security profiles and access options for the UA server of the CP.
● Security profile
– No security profile
– Basic128Rsa15
– Basic256
– Basic256Sha256
If you enable several options, then depending on the settings on the communications
partner (client), the CP selects the profile with the the highest possible security.
● Security procedure of the server
– Sign
– Sign and encrypt
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The CP uses no procedure.
This corresponds to the Security profile "Basic128Rsa15" of the OPC UA
specification.
The CP uses signing and, if configured, 128-bit encryption.
This corresponds to the Security profile "Basic256" of the OPC UA specification.
The CP uses signing and, if configured, 256-bit encryption.
This corresponds to the Security profile "Basic256Sha256" of the OPC UA
specification.
The CP uses signing and, if configured, 256-bit encryption using the hash algorithm
SHA-256.
The CP only allows communication with signed frames.
The CP only allows communication with signed and encrypted frames.
Operating Instructions, 01/2017, C79000-G8976-C427-02
CP 443-1 OPC UA