Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 192)

Error Reporting
Chapter 7
7Ć37
46. Computer link timeout (preset to 500 msec).
47. Not used.
48. Maximum number of NAKs accepted per message (preset to 10).
49. Maximum number of ENQs sent per message (preset to 10).
50. Current NAK count.
51. Current ENQ count.
1785ĆKA Data Highway Diagnostic Counters
Byte No.
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
Received ACK with bad CRC.
Timeout expired with no ACK received.
Mastership contention.
Error in received ACK.
Sum of Bytes 1, 2, and 4.
Received a WAK.
Master died; we assumed mastership.
False Poll: no answer to poll of size = 1.
Received an ACK when not master.
Received frame too small.
Received frame with SRC = DST.
Unused.
Bad CRC in received frame.
Received frame too long.
No buffer for received message; WAK sent.
Received a retransmission of a frame.
Received frame aborted (line noise).
Message successfully sent (low byte first).
Message successfully received (low byte first).
Command successfully sent (low byte first).
Reply successfully received (low byte first).
Command successfully received (low byte first).
Reply successfully sent (low byte first).
Reply could not be sent.