VLT
®
AutomationDrive EtherNet/IP
MG.90.Jx.02 ver. 5
th
September 2007 – VLT is a registered Danfoss trademark 16
Ethernet Link Parameters
Parameter group 12-1* holds information Ethernet Link information:
12-10 Link Status
12-11 Link Duration
12-12 Auto Negotiation
12-13 Link Speed
12-14 Link Duplex
Please note the Ethernet Link Parameters are unique per port.
Par. 12-10 Link Status and par. 12-11 Link Duration displays information on the link status, per
port.
Par. 12-10 Link Status will display Link or No Link according to the status of the present port.
Par. 12-11 Link Duration will display the duration of the link on the present port. If the link is broken
the counter will be reset.
Par. 12-12 Auto Negotiation – is a feature that enables two connected Ethernet devices to choose
common transmission parameters, such as speed and duplex mode. In this process, the connected
devices first share their capabilities as for these parameters and then choose the fastest transmission
mode they both support.
By default this function is enabled.
In case of incompability between the connected devices, it might lead to mismatches that can cause
the communication with decreased performance. For this reason Auto Negotiation can be disabled.
If par. 12-12 is set to OFF, link speed and duplex mode can be configured manually in par. 12-13 and
12-14.
Par. 12-13 Link Speed – displays/sets the link speed per port. “None” is displayed if no link is
present.
Par. 12-14 Link Duplex – displays/sets the duplex mode per port.
Half-duplex provides communication in both directions, but only one direction at a time (not
simultaneously).
Full-duplex allows communication in both directions, and unlike half-duplex, allows this to happen
simultaneously.
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