Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manuel d'utilisateur télécharger pdf (Page 181)

Error Reporting

Chapter 7

726

19. Received Messages: A 16-bit counter that records the number of

messages successfully received.

20. Not used.

21. Number of ACKs received.

22. Not used.

23. Number of ACKs sent.

24. Not used.

25. Number of NAKs received.

26. Not used.

27. Number of NAKs sent.

28. Not used.

29. Undeliverable Replies: Counts the number of replies that were lost

because they could not be delivered over the highway. Undeliverable

commands can be signaled to the user, because the “user” is located

in PC memory and can always be reached. If a reply message cannot

be delivered over the highway, there is no way to signal the user (of

that message), who is also over the highway, that this station cannot

signal a reply. The local user is not concerned with the problems of

the remote user, and can take no meaningful action anyway, so there

is not much to do but destroy the message and count it.

30. Timeout Preset

31. NAK Preset: Values set by diagnostic commands or set by default

on power-up.

32. ENQ Preset

1771KE/KF, 1770KF2 (Data Highway Mode) Error Counters

DATA HIGHWAY COUNTERS

1 2 ... 176 177 178 179 180 181 182 183 184 185 186 ... 234 235

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Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manuel d'utilisateur Page 181