Rockwell Automation Publication ENET-UM004B-EN-P - November 2015 59
Module Diagnostics Chapter 6
Table 4 - Port Diagnostics Parameters - Logix Designer
Parameter Description
Interface Counters The interface Counters values have no value when you are offline or online and
there is a communication error.
Octets Inbound Displays the number of octets that are received on the interface.
Octets Outbound Displays the number of octets that are transmitted to the interface.
Unicast Packets Inbound Displays the number of unicast packets that are received on the interface.
Unicast Packets Outbound Displays the number of unicast packets that are transmitted on the interface.
Non-unicast Packets Inbound Displays the number of non-unicast packets that are received on the interface.
Non-unicast Packets Outbound Displays the number of non-unicast packets that are transmitted on the
interface.
Packets Discarded Inbound Displays the number of inbound packets that are received on the interface but
discarded.
Packets Discarded Outbound Displays the number of outbound packets that are transmitted on the interface
but discarded.
Packets With Errors Inbound Displays the number of inbound packets that contain errors (excludes discarded
inbound packets).
Packets With Errors Outbound Displays the number of outbound packets that contain errors (excludes
discarded outbound packets).
Unknown Protocol Packets Inbound Displays the number of inbound packets with unknown protocol.
Media Counters The Media Counters values have no value when you are offline or online and
there is a communication error.
Alignment Errors Displays the number of frames received that are not an integral number of
octets in length.
FCS Errors Displays the number of frames received that do not pass the FCS check.
Single Collisions Displays the number of successfully transmitted frames that experienced exactly
one collision.
Multiple Collisions Displays the number of successfully transmitted frames that experienced
multiple collisions.
SQE Test Errors Displays the number of times an SQE test error message was generated.
Deferred Transmissions Displays the number of frames for which the first transmission attempt is
delayed because the medium is busy.
Late Collisions Displays the number of times a collision is detected later than 512 bit-times into
the transmission of a packet.
Excessive Collisions Displays the number of frames for which transmission fails due to excessive
collisions.
MAC Transmit Errors Displays the number of frames for which transmission fails due to an internal
MAC sub layer transmit error.
MAC Receive Errors Displays the number of frames for which reception on an interface fails due to an
internal MAC sub layer receive error.
Carrier Sense Displays the number of times that the carrier sense condition was lost or never
asserted when attempting to transmit a frame.
Frame Too Long Displays the number of frames received that exceed the maximum permitted
frame size.
Reset Counters Click Reset Counter to reset the interface and media counter values to zero. The
values then update to the current counter values.
Reset Counter appears dimmed in the following conditions:
• The project is offline.
• The project is online and a communication error occurred.
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