RSTI-EP PROFINET I/O Controller User Manual
Section 7
GFK-2571R
May 2021
Network Management
148
7.2.3
LLDP TLVs
The following is a brief description of the RX3i PROFINET Controller LLDP TLVs.
Chassis ID TLV
The Chassis ID is always the first TLV in the LLDPDU. Chassis ID identifies the device on the
network. PROFINET defines two possible Chassis ID formats; each format has a different
Chassis ID subtype. The PROFINET Controller generally uses the Name of Station (NOS) as
the Chassis ID. If fo
r some reason the station name is changed to the empty string “”, the
internal MAC address is used instead.
ID Subtype Meaning
Value
7
PNIO Chassis ID Name of Station (character string)
4
MAC Address
Internal MAC Address of Ethernet controller
Port ID TLV
The Port ID is always the second TLV in the LLDPDU. The Port ID identifies the individual
network port on the device. PROFINET defines the Port ID as a character string.
ID Subtype Meaning
Value
7
PNIO Port ID
“port
-PPP-
SSSSS” (length = 14
bytes)
PPP specifies the decimal port number in the range 001 to 004. SSSSS specifies the decimal
slot number of the Controller in the range 00000 to 65535.
Time to Live TLV
Time to Live is always the third TLV in the LLDPDU. Time to Live specifies the number of
seconds that the information in this LLDPDU remains valid after delivery on the network. A
Time to Live value of 0 instructs the receiver to immediately invalidate the data in this
LLDPDU and is issued when the PROFINET Controller has changed a parameter that is
advertised in its LLDP.
The PROFINET Controller sets the Time to Live value to 20 seconds.
End of PDU TLV
The End of PDU TLV is always the last TLV in the LLDPDU. This TLV carries no device
information.
PROFINET Port Status TLV
The PROFINET Port Status TLV indicates the current PROFINET status of the network port
over which this LLDP message is sent. Since the PROFINET Controller does not support RT
Class 2 or RT Class 3, the subfields are set to off (0x0000).
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