Application example: FGEN for PROFINET with a Siemens S7
D301271 1013 - FGEN - multi protocol12-12
12.1.9 PROFINET-neighborhood detection (LLDP)
The BL20-gateways support the LLDP protocol (Link Layer Discovery Protocol).
Due to the neighborhood detection, there is no previous PROFINET name assignment (see Name
assignment for FGEN-stations (page 12-11) 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 12-13)).
Necessary setting of 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.
Figure 12-14:
Settings of the
PROFINET-
controller
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