Obtain Ip Address Vie Dhcp: Cp Stop On Expiry Of The Lease; Media Redundancy; Timeofday Synchronization - Siemens SIMATIC S7-300 Equipment Manual

6.8.2

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.
6.9

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 73).
6.10

Timeofday synchronization

General rules
The CP supports the two modes explained below for timeofday synchronization:
• SIMATIC mode
• NTP mode (NTP: Network Time Protocol)
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.
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 73).
CP 343-1 Lean
Equipment Manual, 01/2023, C79000−G8976−C198−09
Configuration and operation
6.9 Media redundancy
51