Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 159)

9–21 Diagnostic Counters
Publication 1770Ć6.5.16 - October 1996
Cat. Nos. Link Pages
1775ĆKA À DH 9-21
1775ĆS5, ĆSR5 DH+ 9-21
À PLCĆ3 processors
1775ĆKA,ĆS5,ĆSR5 DH Diagnostic Counters
DH Port Counters
This counter byte Counts the number of
0
Bad CRCs on acknowledgment.
1 Timeouts that occurred before an ACK was received.
2 Contentions (while master, detected message transmission by
another node).
3 ACKs containing an error.
4 Returned messages (local errors and lost replies).
5 Waits (no receive" buffer space at destination node).
6 Poll time outs (master failed).
7 False polls (failure to transfer).
8 ACKs received when not master.
9 Times the message size was too small (less than 5 bytes).
10 Incorrect DST, or SRC is equal to DST.
11 Times memory was not available for receive buffer.
12 Received messages with bad CRC value.
13 Times a message was too long.
14 Times a message arrived when there was no buffer space left.
15 ReĆtransmissions of a previously received message.
16 Aborts (result of line noise).
17, 18 Messages successfully transmitted.
19, 20 Messages successfully received.
21, 22 Command messages sent.
23, 24 Reply messages received.
25, 26 Command messages received.
27, 28 Reply messages sent.
1775 Cat. Nos.