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Notes on configuration and operation
6.8 Media redundancy
6.7.2
Obtain IP address vie DHCP: CP STOP on expiry of the lease
If you have configured "Obtain IP address from a DHCP server", when the CP starts up, it is
assigned a valid IP address by the DHCP server for a restricted time (period of the lease).
Note
STOP on expiry of the lease
The CP changes to STOP and loses the previously assigned IP address if the DHCP server
does not extend it before expiry of the lease. All communication connections are terminated.
6.8
Media redundancy
You can use the CP in a ring topology with media redundancy. The CP can only be a
redundancy client.
For more detailed information on configuration, refer to the online help of the "Media
redundancy" tab and Part A of the manual, see /1/ (Page 60).
6.9
Timeofday synchronization
General rules
The CP supports the two modes explained below for timeofday synchronization:
● SIMATIC mode
● NTP mode (NTP: Network Time Protocol)
Project engineering
For more detailed information on configuration, refer to the online help of the "Time-of-day
synchronization" parameter group and in Part A of the manual /1/ (Page 60).
6.10
SNMP agent
SNMP (Simple Network Management Protocol)
SNMP is a protocol for managing networks. To transmit data, SNMP uses the
connectionless UDP protocol.
42
No automatic changeover to daylight saving time is defined in NTP. As a result, you may
need to implement this changeover using a program application.
Manual, 10/2012, C79000−G8976−C198−07
CP 343-1 Lean
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