Rockwell Automation 1779-KP5_KP5R ORD.1779-5.3 User Manual

Page 63

1779ĆKP5 Troubleshooting Tools

Chapter 6

6Ć8

You can then use this information to format a Diagnostic Read command.
The reply from the Diagnostic Read command contains the data stored in
the counters.

For more information on the Diagnostic Status and Diagnostic Read
commands, refer to the Data Highway/Data Highway Plus Protocol and
Command Set Reference Manual (Publication 1770-6.5.16).

1779ĆKP5 Data Highway Plus Diagnostic Counters

The 1779-KP5 stores 28 Data Highway Plus counters in 35 bytes. These
counters can only be read from an intelligent device (computer) connected
to the same Data Highway Plus as the 1779-KP5. The following table
contains a list of 1779-KP5 Data Highway Plus diagnostic counter bytes
and what they contain (all two byte counters are read low byte first).

Counter Byte:

Counts the Number of Times:

21, 22

23, 24

25, 26

27, 28

29, 30

31, 32

Received ACK with Bad CRC

Timeout Expired with No ACK Received

Transmit Retries Exhausted

NAK/Illegal Protocol Operation Received

NAK/Bad LSAP Received

NAK/No Memory Received

Received ACK/NAK Too Short

Received ACK/NAK Too Long

Something Other than an ACK or NAK Received

Token Pass Timeout

Token Pass Retries Exhausted

Claim Token Entered

Token Claimed

Bad CRC in Received Frame

NAK/Illegal Protocol Operation Sent

NAK/Bad LSAP Sent

NAK/No Memory Sent

Received Frame Too Short

Received Frame Too Long

Received a Retransmission of a Frame

Received Frame Aborted (Line Noise)

Message Successfully Sent

Message Successfully Received

Command Successfully Sent

Reply Successfully Received

Command Successfully Received

Reply Successfully Sent

Reply Could Not be Sent

Number of Active Nodes