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Manual – MOVI-PLC® advanced DHR41B for EtherNet/IP, Modbus/TCP and PROFINET IO
10
PROFINET configuration with topology detection
PROFINET IO Configuration
10.3 PROFINET configuration with topology detection
10.3.1 Introduction
The PROFINET technology detection allows for projecting and monitoring the structure
of the network with the PROFINET IO controller in addition to the PROFINET IO devic-
es.
The so-called 'Physical device (PHDEV)' is the starting point for the configuration. The
PDEV is a model for the ETHERNET interface and can be found in slot 0 of the config-
uration with an 'ETHERNET interface' subslot and one subslot for each ETHERNET
port.
The visible ETHERNET ports can be connected to the configuration tool. The result is
an image of the desired ETHERNET routing for the plant. This image is stored in the
PROFINET IO controller.
In order to be able to determine the real plant topology, the PROFINET IO devices must
support the so-called LLDP protocol. The PROFINET IO devices exchange information
with the neighboring PROFINET IO devices via LLDP. Via LLDP, each PROFINET IO
device cyclically sends information about its own PROFINET device name and port
number. The neighboring unit receives and stores this information. Now a PROFINET
IO controller can read the stored information from the PROFINET IO devices to deter-
mine the real plant topology.
By comparing the projected topology with the real topology, you can detect any missing
or incorrectly wired PROFINET IO devices and localize them in the plant.
Apart from cabling you can still determine the transmission characteristics for the ports.
For example, you can set an 'Auto-negotiation' port to '100 Mbit full duplex'. The settings
will be monitored.
SNMP as a protocol for network diagnostics extends the topology detection with stan-
dard diagnostics mechanisms from the IT area.
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