WAGO-I/O-SYSTEM 750
Fieldbus Communication 129
750-375 PROFINET IO advanced Fieldbus Coupler
Manual
Version 1.1.0
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
MRP
MRP is specified according to IEC 62439 and enables the changeover of the
communication paths for TCP/IP and RT_CLASS_1 traffic within 200 ms on
error.
To applicate such method there are one Media Redundancy Manager (MRM) such
as one or more Media Redundancy Clients (MRC) required, which are connected
as a ring structure. Thus the installed devices must have at least 2 Ethernet ports.
The MRM, which is commonly implemented on an IO controller or a
PROFINET IO switch, separates the ring into a virtual line structure while
sending the frames to the connected devices only via one port during proper
operation.
Furthermore it checks the configured ring for potential breaks using rotating test
frames, which are only forwarded to the connected neighbor device by MRC.
Does the MRM not receive the test frame sent on a first port via the second one it
detects the location of ring’s break and sends the frames of no longer via a first
port reachable devices on the second port.
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11.1.5
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.
This represents a community message exchange in SNMP versions 1 and 2c. The
community name of the network community must thereby be specified.
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
