258 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 11 Troubleshoot the Controller
Media Counters Provides information specific to Ethernet media you are using
Alignment Errors Frames received that are not an integral number of octets in length.
FCS Errors Frames received that do not pass the FCS (Frame Check Sequence) check.
Single Collisions Successfully transmitted frames that experienced exactly one collision.
Multiple Collisions Successfully transmitted frames that experienced multiple collisions.
SQE Test Errors Number of times an SQE test error message was generated.
Deferred Transmissions Frames for which the first transmission attempt is delayed because the medium is
busy.
Late Collisions Number of times a collision is detected later than 512 bit-times into the transmission
of a packet.
Excessive Collisions Frames for which transmission fails due to excessive collisions.
MAC Transmit Errors Frames for which transmission fails due to an internal MAC sub layer transmit error.
MAC Receive Errors Frames for which reception on an interface fails due to an internal MAC sub layer
receive error.
Carrier Sense Times that the carrier sense condition was lost or never asserted when attempting to
transmit a frame.
Frame Too Long 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.
Table 26 - Port Diagnostics Parameters - RSLinx Classic Software
Parameter Description
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