Rockwell Automation 1769-SDN Compact I/O DeviceNet Scanner Module User Manual - Manual (Page 139)

Publication 1769-UM009E-EN-P - August 2009 139
CompactLogix Backup on the DeviceNet Network Appendix B
This table describes the possible values this message may return when reading
the backup state of the DeviceNet scanner.
If the message reads
this value The backup state of the DeviceNet scanner module is
0 Disabled
1 Primary scanner
2 Backup scanner
3 Invalid primary node address (for example, the node address
cannot be 62 or 63)
4 Faulted backup scanner module - CRC failure (for example,
the scanlists in the scanners do not match)
5 Faulted backup scanner module - backup node number
failure (for example, the backup scanner module is not using
a node number = the primary node number + 1)
6 Backup scanner module pending primary detection
254 Attempting primary access
67 Scanner in Backup Scanner mode
68 No backup scanner module present
69 Invalid backup scanner module CRC
255 Attempting backup access