Properties and services
1.4 Further services and characteristics of the CP
CP 443-1 Advanced (GX30)
Manual, 03/2019, C79000-G8976-C256-05
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Media redundancy
Within an Ethernet network with a ring topology, the CP supports the media redundancy
protocol MRP. You can assign the role of redundancy manager to the CP.
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Timeofday synchronization over Industrial Ethernet using the following configurable
modes:
–
SIMATIC mode
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.
Synchronization using the SIMATIC mode is only possible on the PROFINET
interface.
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 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.
If security is enabled, the CP supports the NTP (secure) protocol for secure time-of-
day synchronization and transfer of the time of day.
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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 the interface being used. Online address assignment is made
in STEP 7.
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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.
If security functions are enabled, the CP supports SNMPv3 for transfer of network
analysis information protected from eavesdropping.
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Module access protection
To protect the module from accidental or unauthorized access, protection can be
configured at various levels.
For more information, refer to the section Effects of protection levels (Page 67).
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IP access protection (IPACL)
Using IP access protection gives you the opportunity of restricting communication over
the CP of the local S7 station to partners with specific IP addresses.
