130 Fieldbus Communication
WAGO-I/O-System 750
750-370 PROFINET IO Fieldbus Coupler
Manual
Version 2.0.0
11.1.3 LLDP
The layer 2 protocol LLDP enables a device on the local network (LAN) to send
information about themselves and to receive information from neighboring
devices.
The device stores the received information in its “LLDP MIB”, from which the
information then can be queried by a network management system using SNMP.
LLDP is sent in periodic intervals to a specific MAC address (MAC-ID: 01-80-
C2-00-00-0E with the ether type = 0x88CC).
It is a one-way transmission, because communication to other devices is not
established. Emitted data packets are not acknowledged by receiving packets.
Sending and receiving takes place independently.
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11.1.4 SNMP
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The Simple Network Management Protocol (SNMP) is responsible for
transporting the control data that allows the exchange of management information
as well as status and statistic data between individual network components and a
management system.
An SNMP management workstation polls the SNMP agents to obtain information
on the relevant devices.
SNMP is supported in versions 1/2c and some fieldbus couplers/controllers in
version 3.
This represents a community message exchange in SNMP versions 1 and 2c. The
community name of the network community must thereby be specified.
In SNMP version 3, exchanging messages is user-related. Each device, that knows
the passwords set via WBM, may read or write values from the controller. In
SNMPv3, user data from SNMP messages can also be transmitted in encoded
form. This way, both requested values and values to be written cannot be easily
decoded by others via ETHERNET. This is why SNMPv3 is often used in safety-
related networks.
The device data, that can be accessed or modified by an SNMP agent, is called
SNMP object. The sets of SNMP objects are stored in a logical database called
Management Information Base (MIB); this is why these objects are typically
known as “MIB objects”.
The SNMP of the ETHERNET controller includes both the general MIB acc. to
RFC1213 (MIB II) and a special WAGO MIB.
SNMP is processed via port 161. The port number for SNMP traps (agent
messages) is 161. Both ports must be enabled to use SNMP.
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