SNMP Operations Example

Modicon M340 Example

The SNMP manager transmits read or write requests (Set_Request, Get_Request, Get_Next_Request, etc.) for objects defined in the MIB - II SNMP and the SNMP agent of the Modicon M340 module responds.

SNMP manager

SNMP agent (Modicon M340)

Get_Response trap

Set_Request, Get_Request, Get_Next_Request

The module's SNMP agent transmits events (traps) to the Manager. The managed trap systems are as follows:

Coldstart Trap:
- On the BMXNOR0200H modules, the event is transmitted following a module supply Reset, a processor Reset, or the downloading of an application to the PLC.
Authentication Failure Trap: An event is transmitted indicating that a network element cannot be authenticated. The Community Name field in the received message is different to the one configured on the module. This trap can be enabled during module configuration.