Properties / services
1.4 Other services
CP 343-1
14 Manual, 12/2018, C79000−G8976−C201-08
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Within an Ethernet network with a ring topology, the CP supports the media redundancy
protocol MRP. You can assign the role of MRP client to the CP.
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Time-of-day synchronization over Industrial Ethernet
Time-of-day synchronization can be configured in the following modes:
– SIMATIC mode
The CP receives MMS time messages and synchronizes its local time and the time of
the CPU.
Accuracy approx. +/- 1 second
You can choose whether or not the time of day is forwarded. The forwarding direction
can also be selected (station > LAN or LAN > station).
or
– NTP mode (NTP: Network Time Protocol)
The CP sends timeofday queries at regular intervals to an NTP server and
synchronizes its local time of day. The forwarding of the time-of-day to the CPU is
optional.
Accuracy approx. +/- 1 second
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Addressing using a factoryset MAC address
The CP can be reached via the default or configured MAC address to allow an IP address
to be assigned.
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The CP supports data queries over SNMP in version V1 (Simple Network Management
Protocol). It delivers the content of certain MIB objects according to the MIB II standard,
LLDP MIB, Automation System MIB and MRP Monitoring MIB.
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To protect the module from accidental or unauthorized access, protection can be
configured.
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IP access protection (IPACL)
Communication via the CP of the local S7 station can be restricted to partners with
specific IP addresses.
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For the PROFINET interface, you can configure how and with which method the CP is
assigned the IP address, the subnet mask and the address of a gateway.
As an alternative to STEP 7, you have the option of assigning the connection
configuration via a block interface in the user program (FB55: IP_CONFIG).
Configuration of S7 connections using FB55 is not possible.
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