turck BL67-GW-PN-AC, User Manual, Page: 19 / 119

D301239 1013 - BL67 AIDA PROFINET
3-3
PROFINET
3.1.3 Address assignment
In IP-based communications, all field devices are addressed by an IP address.
PROFINET uses the Discovery and Configuration Protocol (DCP) for IP assignment.
In the delivery state, amongst others 3 MAC-addresses - one MAC for each (virtual) port for the topology
discovery - and one symbolic name are stored in each field device. These information are enough to
assign each field device a unique name (appropriate to the installation).
Address assignment is performed in two steps:
1 Assignment of a unique plant specific name to the field device.
2 Assignment of the IP address by the IO-Controller before system boot based on the plant specific
(unique) name.
Both steps occur in PROFINET through the integrated standard DCP protocol.
3.1.4 Ethernet MAC-ID
The Ethernet MAC address is a 6-byte-value which serves to definitely identify an Ethernet device. The
MAC address is determined for each device by the IEEE (Institute of Electrical and Electronics Engineers,
New York).
The first 3 bytes of the MAC address contain a manufacturer identifier (Turck: 00:07:46:xx:xx:xx). The last
3 bytes can be chosen freely by the manufacturer for each device and contain a definite serial number.
The MAC address can be read out using the software tool I/O-ASSISTANT 3 (FDT/DTM).
3.1.5 LLDP-Protokoll (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.
Note
The antecedent description contains a short overview about the properties and the functions
of the PROFINET field bus system.
It has been taken from the brochure of the PROFIBUS user organization e.V. (version 2006).
A detailed system description can be found in the standards IEC 61158 and IEC 61784 and in
the PROFIBUS-guidelines and -profiles (www.profibus.com).
Note
Detailed information about the automatic topology discovery in PROFINET via LLDP can be
found on the homepage of the PROFIBUS® user organization under
www.profibus.com. .