Application and functions
1.6 Security functions (CP 1542SP-1 IRC, CP 1543SP-1)
CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1
Operating Instructions, 01/2017, C79000-G8976-C426-03
15
– Only CP 1542SP-1 IRC
When telecontrol communication is enabled, the CP always obtains its local time of
day as UTC time from the communications partner. The time of day of the CP can be
read by the CPU using a PLC tag. For information on the format of the time stamp of
the data frames, refer to the section Datapoint types (Page 59).
If telecontrol communication is disabled, the CP can synchronize its time of day via
NTP.
– Only CP 1543SP-1
If the Security functions are enabled, the secure method NTP (secure) can be used.
For more information, refer to the section Time-of-day synchronization (Page 43).
●
As SNMP agent, the CP supports queries via SNMPv1.
The CP 1543SP-1 also supports SNMPv3.
For more detailed information, refer to section SNMP (Page 45).
Security functions (CP 1542SP-1 IRC, CP 1543SP-1)
The Security functions described below are enabled in the configuration for the relevant CP.
For information on the Securityfunctions of Open User Communication, refer to the section
Programming (OUC) (Page 95).
Note
Recommendation for critical security plants
Refer to the information in the section
Security recommendations (Page 39).
Security functions of the CP 1542SP-1 IRC
●
For secure transfer of information with encrypted e-mails you have the alternative of
using:
– SSL/TLS
– STARTTLS
For information on the configuration, refer to the section Security > E-mail configuration
(Page 86).
●
For the secure authentication of the communications partners, certificates are used.
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