Understanding Statistics
 
Overview
This topic describes the type of statistics provided by the NOET.
Statistics Description
Submit a Get Statistics Request and the NOET provides status information about the module. Other statistics provided by the NOET appear in a list following the results of the Get Statistics Request.
The following parameter information displays when a Get Statistics Request is submitted.
Parameter
Information
Model:
Model number
Media:
10Base-T
HALF DUPLEX
FULL DUPLEX
100Base-T
HALF DUPLEX
FULL DUPLEX
Adapter:
Running
Stopped
I/O stopped. Adapter is in safe mode.
Crash Log Empty
Yes
No - A crash log entry appears.
The NOET can provide the following statistics:
Statistic
Description
Total transaction count
Displays number of transaction completed.
IP address
Displays IP Address.
MAC address
Displays MAC Address
Receive interrupts and transmit interrupts
Displays number of times the PCNET controller chip has generated interrupts.
Transmit timeout errors
Displays number of times the transmitter has been on the channel longer than the interval required to send the maximum length frame of 1519 bytes. The Transmit timeout error is also known as a babble error.
Collision errors
Displays number of collisions detected by the Ethernet chip.
Missed packet errors
Displays number of times a received frame was dropped because a receive descriptor was not available.
Memory errors
Displays number of times an Ethernet controller chip experienced an error accessing shared RAM. A memory error will cause a restart.
Network interface restart count
Displays number of times the Ethernet controller chip was restarted due to fatal runtime errors, including memory errors, transmit buffer errors, and transmit underflow.
Framing errors
Displays number of times an incoming frame contained a non-integer multiple of eight bits.
Overflow errors
Displays number of times the receiver has lost part or all of an incoming frame, due to an inability to store the frame in memory before the internal FIFO overflowed.
CRC errors
Displays number of times a CRC (FCS) error was detected on an incoming frame.
Receive buffer errors
Displays number of times a receive buffer was not available while data chaining a received frame.
Transmit buffer errors
Displays number of times the end packet flag on the current buffer was not set and the Ethernet controller did not own the next buffer. A transmit buffer error causes a restart.
Silo underflow
Displays number of times a packet was truncated due to data late from memory. A Silo Underflow will cause a restart.
Late collision
Displays number of times a collision was detected after the slot time of the channel had elapsed.
Lost carrier
Displays number of times a carrier was lost during a transmission.
Transmit limit retries
Displays number of times the transmitter has failed after 16 attempts to transmit a message, due to repeated collisions.
These statistics also may be obtained from the MSTR block. Refer to the Ladder Logic Block Library User Guide (840USE101) for details.