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D301239 1013 - BL67 AIDA PROFINET
5-15
Application example
5.1.8 PROFINET neighborhood detection
The BL67 gateways support the LLDP protocol (Link Layer Discovery Protocol).
This protocol serves for neighborhood detection between PROFINET nodes and thus allows the simple
exchange of PROFINET network nodes without additional engineering tool.
Due to the neighborhood detection, there is no previous PROFINET name assignment (see Device
name assignment BL67 gateway (page 5-14) is necessary for a new device of the same type and with an
identical process data width in case of a device exchange. The device name and the IP-address will be
assigned to the new device by the neighbor-device configured before (see
Configuring the
neighborhood detection (page 5-16) ).
Necessary setting for the PROFINET controller
The neighborhood detection without using a PC or removable media can only be executed if the
function "Support device replacement without exchangeable medium" is activated within the
properties of the PROFINET-controller.
In case of a device exchange, a new device thus not receives the device name from the removable
medium or the PG but from the IO-controller.
The device name is assigned by means of the devices' port interconnections configured in the topology
definition.
Note
Detailed information about the automatic topology discovery in PROFINET via LLDP can be
found on the homepage of the PROFIBUS user organization (www.profibus.com).
Figure 5-17:
Support device
replacement
without
exchangeable
medium