Rockwell Automation 1785-CHBM ControlNet PLC-5 Hot Backup System User Manual - Manual (Page 82)

Publication 1785-UM024B-EN-P - January 2003
B-2 Backup States
Invalid Backup State
When an improper backup configuration exists, the PLC-5 ControlNet
backup system goes into the Invalid backup state. Both the Primary
and Secondary LEDs on the 1785-CHBM cartridge are solid red when
the system is in this state, and the Qualified and Synchronous LEDs
are off. If you switch the system to Run mode while in the Invalid
backup state, a major fault occurs. (Refer to Chapter 5 for definitions
of the major fault codes.)
The backup system enters the Invalid backup state when one or more
of these conditions exists:
• the 200-word ControlNet Backup Configuration and Status File
does not exist
• the ControlNet Backup Configuration and Status File exists, but
is the wrong size (this file must be exactly 200 words in length)
• the file number index to the ControlNet Backup Configuration
and Status File in S:67 is incorrect
• the ControlNet peer-to-peer backup connections, configured in
RSNetWorx, do not exist or are not correct; these connections
must:
– be sent to and received from the partner processor
– be 5 words long
– have an actual packet interval rate equal to one NUT
• the first 3 words of the ControlNet Backup Configuration and
Status File are incorrectly configured
• one of the optional configuration parameters in the ControlNet
Backup Configuration and Status File is invalid; the following
optional parameters are checked:
– Operational mode (invalid if not equal to 0 or 1)
– Equivalence checks (invalid if greater than 0x3f)
– Designated primary (invalid if not equal to 0 or 1)
Word Valid Configuration
0 must equal the odd node number of the odd-even PLC-5
processor pair
1 must equal the message number of the ControlNet scheduled
peer-to-peer backup connection going from the odd node
number to the even node number of the odd-even PLC-5
processor pair
2 must equal the message number of the ControlNet scheduled
peer-to-peer backup connection going from the even node
number to the odd node number of the odd-even PLC-5
processor pair