Other Services - Siemens SIMATIC S7-300 Equipment Manual

Properties / services

1.4 Other services

1.4 Other services
The CP also provides the following additional services:
• Media redundancy (MRP)
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.
• Time-of-day synchronization over Industrial Ethernet
Time-of-day synchronization can be configured in the following modes:
– SIMATIC mode
or
– NTP mode (NTP: Network Time Protocol)
• Addressing using a factoryset MAC address
The CP can be reached via the default MAC address to allow an IP address to be assigned.
• SNMP agent
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.
• Module access protection
To protect the module from accidental or unauthorized access, protection can be
configured at various levels.
• IP configuration
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).
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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).
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
Equipment Manual, 01/2023, C79000−G8976−C198−09
CP 343-1 Lean