Siemens SIMATIC NET ET 200SP User Manual

Configuration and operation
4.3 Ethernet interface
CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1
44 Operating Instructions, 01/2017, C79000-G8976-C426-03
Note
No forwarding of the time of day with NTP / NTP (secure)
Both the CPU and CP can have the time of day synchronized using NTP. If you enable time
-
of
-day synchronization for both modules, it is recommended that you use the same NTP
server to retain a consistent time
-of-day within the station.
The CP supports the following time-of-day synchronization method:
●
NTP
You configure the addresses of the NTP server(s), the synchronization interval and the
"Accept time from non-synchronized NTP servers" option
CP 1542SP-1 IRC
With telecontrol communication enabled (parameter group "Communication types" the time
of day is normally taken from the partner:
●
Time from partner
The CP sets its clock using the time of day that it receives in frames from the
communications partner.
The CP 1542SP-1 IRC provides the CPU with the option of it taking its time from the CP
using a PLC tag. See section Auto-Hotspot for information on this.
Note
No time-of-day synchronization of the CPU when the time is taken from the CP
When the CPU takes the time fr
om the CP using a PLC tag, disable the CPU's own time-of-
day synchronization.
CP 1543SP-1
Note
Ensuring a valid time of day
If you use security functions, a valid time of day is extremely important. It is recommended to
use the NTP
(secure)NTP (secure) method.
The CP supports the following time-of-day synchronization methods:
●
NTP
●
NTP (secure)
The secure method NTP (secure) uses authentication with symmetrical keys according to
the hash algorithms MD5 or SHA-1.
In the global security settings, you can create and manage additional NTP servers also of
the type NTP (secure).
See also
Communication with the CPU (Page 56)

Siemens SIMATIC NET ET 200SP Specifications

General

Brand	Siemens
Model	SIMATIC NET ET 200SP
Category	Network Router
Language	English