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Configuration and operation
6.8 SNMP agent
Remedy
Note the following recommendations:
• Do not call communication program blocks cyclically in OB1!
Instead, call up communication time-controlled in a suitable time OB. The call interval of
this OB should be significantly higher than the average cycle time of OB1.
• Set a minimum cycle time that is higher than the average execution time of OB1. This
frees resources for communication on the CPU. Setting a minimum cycle time is a suitable
solution, for example, for existing applications when communication already takes place
cyclically in OB1.
• If necessary, reduce the time for processing communication on the CPU. The setting is
made with the "Cycle load due to communication" parameter in the properties of the CPU.
6.8
SNMP agent
SNMP (Simple Network Management Protocol)
SNMP is a protocol for managing networks. To transmit data, SNMP uses the connectionless
UDP protocol.
The information on the properties of SNMPcompliant devices is entered in MIB files (MIB =
Management Information Base).
The CP supports data queries using SNMP in version 1. It supplies the content of certain MIB
objects according to MIB-II (RFC1213), PRP-MIB IEC62439 (IEC-62439-3-MIB) and Automation
System MIB.
MIB file and SNMP profile file
You will find the MIB file and the SNMP profile file of the module in the STEP 7 installation in
the folders "S7DATA" > "snmp" under the name of the module.
Further information
For more detailed information on working with MIB files, refer to the documentation of the
SNMP client you are using (example of an SNMP client: SNMP OPC server from SIMATIC NET).
For more information on SNMP, refer to the /12/ (Page 76) manual.
Supported MIBs
The CP supports the following groups of MIB objects of the standard MIB II according to
RFC1213:
• System
• Interfaces
• IP
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Equipment Manual, 03/2022, C79000-G8976-C318-05
CP 442-1 RNA
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