Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual de usuario Pagina 159

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9–21Diagnostic Counters
Publication
17706.5.16 - October 1996
Cat. Nos. Link Pages
1775KA
À
DH 9-21
1775S5, SR5 DH+ 9-21
À
PLC3
processors
1775KA,S5,SR5 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 Retransmissions 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.
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