Siemens SIMATIC S7-400 Operating Instructions Manual page 46

Configuration and operation
4.7 Configuration of the CP in STEP 7 V5
Configuration
Requirement for configuring the parameters described below is the activation of the security
functions, see section "Security" Tab (Page 47).
If the security functions are enabled, you have the following selection and setting options.
"Enable SNMP"
If the option is enabled, communication via SNMPv1 is enabled on the device.
If the option is disabled, queries from SNMP clients are not replied to either via SNMPv1 or
via SNMPv3.
To be able to make further settings, click the "Run" button under the following entry.
"Start of SNMP configuration"
If you click the "Run" button, the SCT window for SNMP configuration opens.
● "Use SNMPv1"
Enables the use of SNMPv1 for the CP. The following community strings need to be sent
along with access to the CP via SNMPv1.
– "Read community string"
– "Allow write access"
– "Writing community string"
● "Use SNMPv3"
Enables the use of SNMPv3 for the CP. The following algorithms need to be configured
for encrypted access to the CP via SNMPv3.
– "Authentication algorithm"
– "Encryption algorithm"
"Start of user administration"
If you click the "Run" button the SCT user management opens. There assign the role to the
various users.
Below the properties of the roles you can see the rights list of the particular role, for example
the various types of access using SNMP. For new roles, you can freely configure individual
rights.
You will find information on users, roles and the password policy in the online help of the
SCT.
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The string is required for read access. Leave the preset string or configure a string.
If the option is enabled write access to the CP is released and the corresponding
community string can be edited.
The string is required for write access and can also be used for read access. Leave
the preset string or configure a string.
Select the authentication method to be used from the drop-down list.
Select the encryption method to be used from the drop-down list.
Note the information on security of the possible algorithms in the online help of the
SCT.
Operating Instructions, 01/2017, C79000-G8976-C427-02
CP 443-1 OPC UA