Snmp Agent - Siemens SIMATIC NET S7-400 Manual

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).
You will find more information on the MIB on the Internet:
Link: (https://support.industry.siemens.com/cs/ww/en/view/15177711)
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CP 443-1 RNA
Manual, 03/2019, C79000-G8976-C299-04