ABB PGC2000 Operation And Service Manual page 324

Retries: Number of UDP transmissions retried. Under normal conditions, such as a station off-line,
this will be exactly twice the number of Transmit Errors.
Collisions: Number of times this station has detected a loss of transmission on the wire due to
collision with another station or overcome by noise.
Last Destination: Address of the destination of the last UDP transmission.
Tokens Issued: Number of times this station has detected a dead line and the slot assignment time
has expired, resulting in an issuance of a token.
Tokens Dropped: Number of times the token destination did not accept the token, or the token was
lost. This indicates the number of times this station has seen a station go off-line, or line noise
caused the packet to be corrupted.
Tokens Passed: Number of tokens processed by this station.
Receive Statistics
Receives: Number of packets sent to this station.
Errors: Number of unintelligible packets received by this station. Since there is an error condition, it
is indeterminate whether this was a UDP packet or a token.
Last Error: Encoded error condition indicating the failure detected by a receiver error, as follows:
1. Overrun - indicates a new character received before the last was processed.
2. Collision Abort - indicates a collision occurred during reception.
4. Alignment - indicates a new start of frame was detected before an end of frame.
8. CRC Error - indicates the CRC was in error.
16. Unknown - indicates more than one error condition existed during reception.
32. DMA Overrun - indicates the sending station attempted to send a packet larger than UDP size,
524 bytes.
Uploads: Number of packets moved from the receive buffer pool into dual port memory for transfer
to the host.
Queued: Number of interrupts issued to the host to retrieve an uploaded packet.
Dequeued: Number of interrupts issued to this board from the host indicating acknowledgement of a
queued packet.
Backups: Number of times this station has run out of receive buffers due to host interrupt latency.
Invalid: Number of times the host issued unknown commands to this board.
Tokens Received: Number of tokens received by this station. Tokens are broadcast objects, all
tokens are seen by every station.
Tokens Dumped: Number of tokens disposed of due to load at this station, or another station issued
a token (indicating a receiver problem at that station). A token was seen on the wire while this station
had a token.
8-70 2000-OSM, F1