Configuration
4.5 Time-of-day synchronization
CP 154xSP-1
58
Operating Instructions, 12/2019, C79000-G8976-C426-05
Time-of-day synchronization of the CPs
The CPs support the following methods of time-of-day synchronization:
●
CP 1542SP-1
–
NTP
–
From local station
Configurable at the Ethernet interface
●
CP 1543SP-1
–
NTP
–
NTP (secure)
–
From local station
If the security functions are enabled, configurable under "Security"
●
CP 1542SP-1 IRC
–
NTP
–
From local station
And - depending on the telecontrol protocol:
–
Time from partner / from WAN
For details, refer to the configuration manuals Documentation references (Page 113).
Forwarding the time to the CPU
The CPs provides the CPU with the option of taking its time of day from the CP using a PLC
tag. See section Communication with the CPU (Page 59) for more on this.
When the CPU takes the time from the CP using a PLC tag, disable the CPU's own time-of-
day synchronization.
Procedure for time-of-day synchronization
The time-of-day synchronization procedures of the respective CP types are described below.
●
NTP
You configure the addresses of the NTP server(s), the synchronization interval and the
"Accept time from non-synchronized NTP servers" option.
●
NTP (secure)
The secure method NTP (secure) uses authentication with symmetrical keys. Various
configurable hash algorithms are available for the integrity check.
In the global security settings, you can create and manage NTP servers of the type
NTP (secure).
