Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 68)

6–4 Troubleshooting
Publication 1395.5.37 – March, 1999
If any bit is set to one in the Fault Select word, then if the corresponding
event occurs, the drive will Soft Fault, and thus not be running. If the
fault was one that causes loss of I/O image to be received (0,2,3,5) then
the Last State bit is used to define what should be done to the entire Input
Image (all 8 words). If Last State is a one, the input image is left in the
last state prior to the fault being detected. If Last State is a zero, then the
8 input words are all set to zero.
The Warning Select parameter is used to determine if any event not
specified to be handled as a fault in the Fault Select word should be
treated as a warning. If a bit is set to a one, then a warning annunciation
will occur for the corresponding event, but only if the corresponding bit
in the Fault Select word is a zero. If any of the events that cause loss of
I/O data occur (0,2,3,5) and that event is being annunciated as a warning,
then the Last State bit in the Warning Select word is used to determine
the state of the Input image. This works identically to the Last State bit
for events being handled as faults.
If any bit position is set to zero for both the Fault Select word and the
Warning Select word, then the event corresponding to that bit is ignored
(not annunciated as either a fault or a warning). The Warning Select’s
Last State bit is applied to the I/O image for the following events
ICN Comm Loss
Class 1 Close
Class 1 Timeout
The case of a Reset/Program/Test event occurring, but set set to be
ignored will always result in the I/O image being left in the last state (not
zeroed even if Warning Select’s Last State bit is zero). This is consistent
with the operation of the existing RIO adapters.