252 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 11 Troubleshoot the Controller
Table 24 - 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 cause the interface and media counter values on the
module to set to zero, and the values in the dialog to update.
Reset Counter appears dimmed when either of the following conditions
exist:
• The project is offline.
• The project is online and a communication error has occurred.
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