Further Services And Characteristics Of The Cp - Siemens SIMATIC NET CP 442-1 RNA Equipment Manual

Application and functions

1.4 Further services and characteristics of the CP

Example of a configuration for a PRP network
The following figure shows the options for connecting devices in a network topology in
which the Parallel Redundancy Protocol (PRP) is used.
Figure 1-2
1.4 Further services and characteristics of the CP
• Timeofday synchronization over the RNA interface using the following configurable
modes:
– SIMATIC mode
or
– NTP mode (NTP: Network Time Protocol)
• Addressable with the factoryset MAC address
To assign the IP address to a new CP (direct from the factory), it can be accessed using the
preset MAC address on port X2P1 of the RNA interface. Online address assignment is
made in STEP 7.
16
Example of the configuration of a network topology with PRP
The CP receives MMS timeofday messages and synchronizes its local time.
You can choose whether or not the time of day is forwarded. You can also decide on
the direction in which it is forwarded.
The CP sends timeofday queries at regular intervals to an NTP server and synchronizes
its local time of day.
The time can also be forwarded automatically to the CPU modules in the S7 station
allowing the time to be synchronized in the entire S7 station.
Equipment Manual, 03/2022, C79000-G8976-C318-05
CP 442-1 RNA