5. CONFIGURATION
PROGRAM UserPrg
VAR
ClearEventQueueStatus : TYPE_RESULT;
END_VAR
ClearEventQueueStatus := ClearEventQueue();
5.13. SNMP
5.13.1. Introduction
SNMP (Simple Network Management Protocol) is a protocol widely used by network administrators to provide important
information and diagnostic equipment present in a given Ethernet network.
This protocol uses the concept of agent and manager, in which the manager sends read requests or write certain objects
to the agent. Through a MIB (Management Information Base) the manager is aware of existing objects in the agent, and thus
can make requests of these objects, respecting the read permissions or writing the same. MIB is a collection of information
organized hierarchically with each object of this tree is called OID (Object Identifier).
For all equipment with SNMP, it is mandatory to support MIB-II. In this MIB are described key information for managing
Ethernet networks.
5.13.2. SNMP nas UCPs Nexto
The CPUs of the Nexto Series behave as agents in SNMP communication. The information made available through SNMP
cannot be manipulated or accessed through the user application, requiring an external SNMP manager to perform access. The
table below contains the objects available in the Nexto CPUs. This feature is available after firmware version 1.4.0.33 of the
Nexto Series CPUs supports the protocols SNMPv1, SNMPv2c and SNMPv3, and support the MIB-II, where required objects
are described in RFC-1213.
OID Name Description
1.3.6.1.2.1.1 System
Contains name, description, location and other equip-
ment identification information.
1.3.6.1.2.1.2 Interfaces
Contains information of the machine’s network inter-
faces. The ifTable (OID 1.3.6.1.2.1.2.2) has the indexes 6
and 7 available, which can be viewed by the network in-
terfaces statistics NET 1 and NET 2, respectively, of the
Nexto Series CPUs.
1.3.6.1.2.1.3 At
Contains information of the last required connections to
the agent.
1.3.6.1.2.1.4 IP Contains statistical connections using IP protocol.
1.3.6.1.2.1.5 ICMP Contains statistical connections using ICMP protocol.
1.3.6.1.2.1.6 TCP Contains statistical connections using TCP protocol.
1.3.6.1.2.1.7 UDP Contains statistical connections using UDP protocol.
1.3.6.1.2.1.11 SNMP Contains statistical connections using SNMP protocol.
1.3.6.1.2.1.31 ifMib Extension to Interfaces, OID 1.3.6.1.2.1.2.
Table 200: MIB II Objects – Nexto Series SNMP Agent
By default, the SNMP agent is activated, i.e., the service is initialized at the time the CPU is started. The access to the
agent information is via the Ethernet interfaces NET 1 and NET 2 of the Nexto Series CPUs on TCP port 161. So when the
service is active, the agent information can be accessed through any one of the two Ethernet interfaces, if available. It is not
possible to provide agent information through Ethernet interfaces NX5000 modules. In figure below an example is shown
SNMP manager, in which some values are read.
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