Manual

1779KP5 Troubleshooting Tools
Chapter 6
68
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).
1779KP5 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 T imes:
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21, 22
23, 24
25, 26
27, 28
29, 30
31, 32
33
34
Received ACK with Bad CRC
T imeout Expired with No ACK Received
T ransmit Retries Exhausted
NAK/Illegal Protocol Operation Received
NAK/Bad LSAP Received
NAK/No Memory Received
Received ACK/NAK T oo Short
Received ACK/NAK T oo Long
Something Other than an ACK or NAK Received
T oken Pass T imeout
T
oken Pass Retries Exhausted
Claim T oken Entered
T oken Claimed
Bad CRC in Received Frame
NAK/Illegal Protocol Operation Sent
NAK/Bad LSAP Sent
NAK/No Memory Sent
Received Frame T
oo Short
Received Frame T oo 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